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Offlinejoshxjosh
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HEPA filter selection
    #23442507 - 07/14/16 11:25 PM (7 years, 6 months ago)

I'm having a hard time choosing a HEPA filter, maybe im not educated enough yet but all of the filters im finding are rated for 2000 cfm like http://www.ebay.com/itm/Koch-Biomax-HEPA-Filter-24-x-24-x-12-99-97-High-Capacity-/162113396462?hash=item25beb61eee:g:JY0AAOSwx-9Wt66g
and
http://www.ebay.com/itm/162113396510?item=162113396510&rmvSB=true

Would these filters work with a lower CFM fan? According to fungifun only about a 500cfm fan should be necessary to run this size right? any input is appreciated


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InvisibleMarty Mycfly
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Re: HEPA filter selection [Re: joshxjosh]
    #23442604 - 07/15/16 12:28 AM (7 years, 6 months ago)

Quote:

joshxjosh said:
I'm having a hard time choosing a HEPA filter, maybe im not educated enough yet but all of the filters im finding are rated for 2000 cfm like http://www.ebay.com/itm/Koch-Biomax-HEPA-Filter-24-x-24-x-12-99-97-High-Capacity-/162113396462?hash=item25beb61eee:g:JY0AAOSwx-9Wt66g
and
http://www.ebay.com/itm/162113396510?item=162113396510&rmvSB=true

Would these filters work with a lower CFM fan? According to fungifun only about a 500cfm fan should be necessary to run this size right? any input is appreciated




That flanders filter will need a little stronger fan, this one will work
https://www.zoro.com/dayton-blower-549-cfm-115v-205a-1640-rpm-1tdt2/i/G1061216/?gclid=CPDzyrvr9M0CFYRrfgodiesMwg&gclsrc=aw.ds


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23442620 - 07/15/16 12:37 AM (7 years, 6 months ago)

Quote:

Marty Mycfly said:
Quote:

joshxjosh said:
I'm having a hard time choosing a HEPA filter, maybe im not educated enough yet but all of the filters im finding are rated for 2000 cfm like http://www.ebay.com/itm/Koch-Biomax-HEPA-Filter-24-x-24-x-12-99-97-High-Capacity-/162113396462?hash=item25beb61eee:g:JY0AAOSwx-9Wt66g
and
http://www.ebay.com/itm/162113396510?item=162113396510&rmvSB=true

Would these filters work with a lower CFM fan? According to fungifun only about a 500cfm fan should be necessary to run this size right? any input is appreciated




That flanders filter will need a little stronger fan, this one will work
https://www.zoro.com/dayton-blower-549-cfm-115v-205a-1640-rpm-1tdt2/i/G1061216/?gclid=CPDzyrvr9M0CFYRrfgodiesMwg&gclsrc=aw.ds




Thanks for the reply. A ~550cfm blower would be sufficient to give me a laminar flow?


Edited by joshxjosh (07/15/16 12:38 AM)


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InvisibleMarty Mycfly
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Re: HEPA filter selection [Re: joshxjosh]
    #23442662 - 07/15/16 12:59 AM (7 years, 6 months ago)

Yes it's perfect for that size of filter, A lot of people that run a 24x24x12 filter use that exact same fan, I do as well. Most of the specs out there on filters and fans are for filters half that depth, hence why a stronger fan is needed for a 12" thick filter.


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Offlinejoshxjosh
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Re: HEPA filter selection [Re: Marty Mycfly]
    #23442669 - 07/15/16 01:04 AM (7 years, 6 months ago)

Quote:

Marty Mycfly said:
Yes it's perfect for that size of filter, A lot of people that run a 24x24x12 filter use that exact same fan, I do as well. Most of the specs out there on filters and fans are for filters half that depth, hence why a stronger fan is needed for a 12" thick filter.



Quote:

Marty Mycfly said:
Yes it's perfect for that size of filter, A lot of people that run a 24x24x12 filter use that exact same fan, I do as well. Most of the specs out there on filters and fans are for filters half that depth, hence why a stronger fan is needed for a 12" thick filter.




So the fact that the filter is rated at 1" @ 2000cfm means nothing to us, correct?


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InvisibleMarty Mycfly
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Re: HEPA filter selection [Re: joshxjosh]
    #23442736 - 07/15/16 01:45 AM (7 years, 6 months ago)

It's fine, a 12" deep filter isn't ideal anyways, but they work fine, it's far less complicated than we make it out to be. I have a filter the same size and rating with the same fan I showed you, it rocks.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23442822 - 07/15/16 02:34 AM (7 years, 6 months ago)

Quote:

Marty Mycfly said:
Yes it's perfect for that size of filter, A lot of people that run a 24x24x12 filter use that exact same fan, I do as well. Most of the specs out there on filters and fans are for filters half that depth, hence why a stronger fan is needed for a 12" thick filter.





Wrong. A 12" filter has less resistance so it actually needs a less powerful blower.

Also, 12" filters are not really what you want for hoods. They work just fine but are bulky as shit and the plenum needs to be as thick as the filter. The hood can easily be 2ft+ deep, incredibly bulky and heavy as fuck. I would try and find a 4-6" one instead. 6" filters are specifically made for laminar flow, 12" ones are made for cleaning entire rooms.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23443992 - 07/15/16 01:34 PM (7 years, 6 months ago)

Quote:

Supalemonhaze said:
Quote:

Marty Mycfly said:
Yes it's perfect for that size of filter, A lot of people that run a 24x24x12 filter use that exact same fan, I do as well. Most of the specs out there on filters and fans are for filters half that depth, hence why a stronger fan is needed for a 12" thick filter.





Wrong. A 12" filter has less resistance so it actually needs a less powerful blower.

Also, 12" filters are not really what you want for hoods. They work just fine but are bulky as shit and the plenum needs to be as thick as the filter. The hood can easily be 2ft+ deep, incredibly bulky and heavy as fuck. I would try and find a 4-6" one instead. 6" filters are specifically made for laminar flow, 12" ones are made for cleaning entire rooms.




Exactly, a 12" filter is not ideal for laminar flow, the fan I showed him is what everybody uses though for that size filter anyways.
https://www.shroomery.org/forums/showflat.php/Number/19357797#19357797

this is where I first saw a 12" filter get built, he ended up using a smaller fan at first and eneded up needing the dayton 1tdt2. He explains it in there a little more why.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23444220 - 07/15/16 02:58 PM (7 years, 6 months ago)

That blower he mentioned is smaller than the one I have on my 4" hepa. 12" filters are made to clean entire rooms and in order to do that, manufacturers build them with less resistance so more air can be filtered faster. If you compare the rated CFM of a 12" to a 6", this will be obvious.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23444237 - 07/15/16 03:03 PM (7 years, 6 months ago)

Quote:

Supalemonhaze said:
That blower he mentioned is smaller than the one I have on my 4" hepa. 12" filters are made to clean entire rooms and in order to do that, manufacturers build them with less resistance so more air can be filtered faster. If you compare the rated CFM of a 12" to a 6", this will be obvious.




What are the full dimensions of your filter?


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23444244 - 07/15/16 03:06 PM (7 years, 6 months ago)

20x22"


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23444299 - 07/15/16 03:27 PM (7 years, 6 months ago)

What blower are you using? It could be specs of the blower is different, is it a dayton? That one is a Dayton 1TDT2.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23444320 - 07/15/16 03:35 PM (7 years, 6 months ago)

Either way, he should find a filter with a smaller depth, I was just telling him what people are using for that particular size.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23444346 - 07/15/16 03:44 PM (7 years, 6 months ago)

My blower is ~600cfm at free air, don't have exact specs, I've built this last year. It's not the "blower's different specs", it's that a 4-6" filter has more resistance than a 12" filter.

Quote:

RogerRabbit said:
You won't get laminar flow with that filter.  12" filters are for clean rooms, not flow hoods.  In a clean room, you want lots of flow with little resistance.  For laminar flow, you want lots of resistance so you can achieve a small rate of laminar flow.  You want the +/- 6" filters for a flow hood.
RR



Quote:

RogerRabbit said:

Based on the specs above, I'd go with the 6" deep filter because it has higher resistance.  The resistance is what helps achieve laminar flow by creating pressure on the back side of the filter.  If every inch of the back side is under pressure, the air flows smoothly out the front side.

I'd go with the 6" filter and a blower rated at 450 cfm @ 1" W.G.
RR




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Re: HEPA filter selection [Re: Supalemonhaze]
    #23444380 - 07/15/16 03:56 PM (7 years, 6 months ago)

Agreed on a smaller filter is true laminar flow, RR says right there he suggests a 450cfm fan, what size of filter was he referring too? 12x24?


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23444403 - 07/15/16 04:04 PM (7 years, 6 months ago)

Bigger filters still get laminar flow pretty easy. RR was just saying that to avoid going into the unknown at the time. There was a guy a few months back post a few guidelines on laminar flow hoods and he said there is no static pressure requirement for laminar flow. I'm inclined to believe him because I've helped a member with a 12" flow hood build and he only has about 0.3" s.p w.g with the prefilter included.

Keep in mind that RR is reccommending that blower at a s.p of 1.0" w.g. The guy in the other thread has 550cfm at a s.p of 0.0" w.g (free air). The blower RR was recommending was still more powerful than the one you linked.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23444417 - 07/15/16 04:08 PM (7 years, 6 months ago)

I agree that you should probably look around for a 6" deep filter. It just makes life easier when building a hood. Unfortunately most of the filters sold on eBay are 12" deep.

Thats why I just bit the bullet and bought my filter off Fungi Perfecti- its a fair price considering you know the filter will be shipped safely (they are super delicate).
I bought my blower off Ebay though.

From what I understand though- if you do use a 12" deep filter you will want *at least* a 12" deep plenum behind it.



As far as blowers go.... you NEED to read the specs. They all have a graph showing what CFM they blow at various SP.

Blowers are listed by what they push @ free air (no SP). For a 24 x 24 " filter you need a blower that pushes 400CFM @ an SP of 1 - 1.2 (.2 for the pre filter)... so you would ask the seller for the blower specs before you buy it, then look at the chart to see what it pushes at 1.2sp.

You might have 2 different blowers that are listed as 900CFM (free air), but one might push X @ 1 sp while the other pushes Y @ 1 sp

Thats why you gotta check the specs. Pick your filter size first, then start shopping for a blower :thumbup:


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Re: HEPA filter selection [Re: mushpunx]
    #23444428 - 07/15/16 04:13 PM (7 years, 6 months ago)

Quote:

mushpunx said:


Thats why I just bit the bullet and bought my filter off Fungi Perfecti- its a fair price




:lolsy:

Pretty sure FP and fair price don't go together. I mean damn, some shit is double the price you would get them on ebay. I find it comical that FP and fair price have the same initials haha.

You're right though, buying from a mycology store will bring peace of mind, although, I would only ever buy from FP as a last resort. And I really do mean, last.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23444776 - 07/15/16 05:57 PM (7 years, 6 months ago)

My filter was around 150-160 at the time I bought it, its about 170 now

It came sealed up new at the time with flat boards on both sides and banded with plastic shipping bands

I don't think that's all that unreasonable is it?

My Dayton blower I got new in box off Ebay for 80$ and free shipping


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Re: HEPA filter selection [Re: mushpunx]
    #23445007 - 07/15/16 07:16 PM (7 years, 6 months ago)

I was going to buy one from them a while ago, so I called up to order it over phone and decided not to because the shipping was outrageous, I dont remember what it was but it was enough to say fuck that!


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23445012 - 07/15/16 07:20 PM (7 years, 6 months ago)

So a 12" thick filter would work fine, it's just bulky and would require a 12" inch "box' behind it and the Dayton blower?

I'm confused because the blower is unrated @ 1.00 SP and 1.2 according to the spec sheet on zoro


Edited by joshxjosh (07/15/16 07:32 PM)


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Re: HEPA filter selection [Re: joshxjosh]
    #23445056 - 07/15/16 07:37 PM (7 years, 6 months ago)

With 12" filters and fans it's all open for debate, they are not true laminar flow but work fine, really you can just hook up any old fan to HEPA filter and have sterile air pumping out.
But If you have not bought your filter yet, keep looking for a 6" one, especially if your worried about getting all of the specs perfect.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23445064 - 07/15/16 07:38 PM (7 years, 6 months ago)

I'm still looking for a 6 inch, thanks and I'm finding some similar Dayton blowers on eBay for pretty cheap which also have similar ratings, but none rated @ 1" SP. if it works fine for you I don't see why it wont work for me!


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23445542 - 07/15/16 11:27 PM (7 years, 6 months ago)

Quote:

Marty Mycfly said:
I wassup the ng to buy one from them a while ago, so I called up to order it over phone and decided not to because the shipping was outrageous, I dont remember what it was but it was enough to say fuck that!





They ship freight tho. Seriously if you just bump the face of your filter it crushes the metal pins... they crumple up like foil and you can put holes in the filter material.
So you want it to come unscathed... those damaged parts will render those places on the filter not qorkable.

Earth's Tongue.... now those guys charge high shipping!! The filters are very low prices but the shipping (from the manufacturer) costs just as much!!

Keep in mind if you build your hood well it will last many, many years


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Re: HEPA filter selection [Re: mushpunx]
    #23445551 - 07/15/16 11:36 PM (7 years, 6 months ago)

I may just have to bite the bullet and purchase a filter on from FP, unless someone is wanting to sell theirs? If anyone has purchased a filter from FP could you let me know how much they charged for shipping?


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Re: HEPA filter selection [Re: mushpunx]
    #23445557 - 07/15/16 11:41 PM (7 years, 6 months ago)

Quote:

mushpunx said:
My filter was around 150-160 at the time I bought it, its about 170 now

It came sealed up new at the time with flat boards on both sides and banded with plastic shipping bands

I don't think that's all that unreasonable is it?

My Dayton blower I got new in box off Ebay for 80$ and free shipping





Well, the filter I bought was like 90$ on ebay. NOS. The only reason why I paid even more than you is because of shipping to the EU. Shipping cost me as much as the filter+ import tax. Pretty brutal. So yeah, I'd say you over paid.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23445571 - 07/15/16 11:46 PM (7 years, 6 months ago)

Quote:

Marty Mycfly said:
they are not true laminar flow but work fine,




Also untrue.

There is laminar flow and then there is turbulent flow, there is no in-between. Please stop saying stuff you don't know about. A 12" filter is capable of laminar flow as much as a 6" one, they just didn't know it in the past.

As OP said, the only setback with a 12" is it's bulk and the plenum required for it.

The folks I helped with a 12" hepa build both have perfect laminar flow with not even half an inch of static pressure. I worked it out for one guy and it was 0.3" w.g s.p with the prefilter included. Doesn't matter how sterile the air is, if the flow is turbulent, it will just blow contams from the outside of the jar to it's inside and it will not work. If it works, it's laminar.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23445729 - 07/16/16 01:29 AM (7 years, 6 months ago)

:whathesaid:

That was my understanding of 12" deep filters. You need to use at *least* (I would go a lot bigger) plenum which adds a good bit of bulk to the hood, plus the added weight of the thicker filter

But other than that they work for flow hoods


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Re: HEPA filter selection [Re: mushpunx]
    #23446942 - 07/16/16 02:11 PM (7 years, 6 months ago)

Quote:

Supalemonhaze said:
Quote:

Marty Mycfly said:
they are not true laminar flow but work fine,




Also untrue.

There is laminar flow and then there is turbulent flow, there is no in-between. Please stop saying stuff you don't know about. A 12" filter is capable of laminar flow as much as a 6" one, they just didn't know it in the past.

As OP said, the only setback with a 12" is it's bulk and the plenum required for it.

The folks I helped with a 12" hepa build both have perfect laminar flow with not even half an inch of static pressure. I worked it out for one guy and it was 0.3" w.g s.p with the prefilter included. Doesn't matter how sterile the air is, if the flow is turbulent, it will just blow contams from the outside of the jar to it's inside and it will not work. If it works, it's laminar.




I think your just being contrary now, first you were telling him to get a different size, but now that I told him that you changed your tune. MushCult man, what a pissing contest.
I do know I have a 12" filter and it's works great, I have inoculated thousands of sawdust bags and worked hundreds of plates and master jars and bags in front of it. It's set up with that Dayton blower and it rocks, perfect 90 degree angle with a lighter. I was suggesting if the OP is super stuck on getting specs matched up like it's layed out in TMC and by RR, then get the 6" filter to make it easier.

Here is a quote from LIPA in a discussion that was going on about filter thickness down in GMM,
Quote:

lipa said:
Laminar flow is not achieved unless sufficient pressure is developed behind it causing the flow of air to exit the filter "evenly" over its face. Yes, you can do sterile work in front of a 12 inch deep filter if you are working right in front of it. I hate working directly in front of a flow hood due to the fact you can spill shit on it easily. I have mine set up correctly and I can work 2-3 feet away from the front of it and still be within the air stream. That's the difference.  Most Hepas are built to be used for laminar flow. The metal separators(or "plastic" help direct the air forward and support the pleats. This facilitates better air flow within ducting, hoods and in ceiling units. You want the air to go strait down and exit in a cleanroom not flow in random ways throughout the room. While it might work for you it is not the correct filter to use.


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Edited by Marty Mycfly (07/16/16 03:18 PM)


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23447893 - 07/16/16 09:17 PM (7 years, 6 months ago)

Contrary? How did you figure that? I'm merely correcting you on stuff you clearly know nothing about. 12" filters having more resistance, 12" filters don't achieve true laminar flow, it's all bullshit and completely inaccurate.

6" filters are made specifically for laminar flow and that's the optimal choice because you can't ever go wrong with one of those but a 12" filter is perfectly capable of laminar flow regardless of what you or others thought a decade ago. Without laminar flow, you cannot work with sterility. Even if you never touch the jar with your hands after opening, the turbulent flow alone is enough to contaminate it.

In the past, it was always thought that pressure alone will determine if you will have laminar flow or not. This is not the case as hundreds of 12" FH builds have proved. OP has since PMed me for help with this build and I worked out the s.p he would have with 100fpm. The result is barely 0.2s.p, something that according to RR will never create laminar flow. As I said before, people I have helped in the past had the exact same s.p and they have perfect laminar flow. The plenum will do a very nice job at creating even pressure at the back of the filter, that is entirely the reason why a 12" filter needs a bigger plenum. The filter itself has the same resistance over the whole filter face so even that will lean towards wanting to create laminar flow. Keep in mind that the air being blown by the blower has to make a 90degree turn, this alone is already helping at making the flow linear and parallel, the plenum and the filter will take care of the rest.

If this was something I haven't experienced, I would just shut up and say nothing but the people I have helped with these filters all have perfectly good flowhoods. Static pressure is not the only reason why we get laminar flow, it's just as easy as that. Saying inaccurate shit is not going to help anybody, stick to what you know and we're good.

The people who say that 12" filters won't create laminar flow are merely following the advice that was laid down years ago when people were not sure of what would happen. There have been hundreds of successful builds since then and so we learned. I can quote you a user who used to recommend nothing but 12" filters for FHs and although I don't agree with his choice, I understand where he is coming from. 12" filters are cheaper and the blower required will be smaller, saving money all around.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23449745 - 07/17/16 12:23 PM (7 years, 6 months ago)

Quote:

Supalemonhaze said:
Contrary? How did you figure that? I'm merely correcting you on stuff you clearly know nothing about. 12" filters having more resistance, 12" filters don't achieve true laminar flow, it's all bullshit and completely inaccurate.

6" filters are made specifically for laminar flow and that's the optimal choice because you can't ever go wrong with one of those but a 12" filter is perfectly capable of laminar flow regardless of what you or others thought a decade ago. Without laminar flow, you cannot work with sterility. Even if you never touch the jar with your hands after opening, the turbulent flow alone is enough to contaminate it.

In the past, it was always thought that pressure alone will determine if you will have laminar flow or not. This is not the case as hundreds of 12" FH builds have proved. OP has since PMed me for help with this build and I worked out the s.p he would have with 100fpm. The result is barely 0.2s.p, something that according to RR will never create laminar flow. As I said before, people I have helped in the past had the exact same s.p and they have perfect laminar flow. The plenum will do a very nice job at creating even pressure at the back of the filter, that is entirely the reason why a 12" filter needs a bigger plenum. The filter itself has the same resistance over the whole filter face so even that will lean towards wanting to create laminar flow. Keep in mind that the air being blown by the blower has to make a 90degree turn, this alone is already helping at making the flow linear and parallel, the plenum and the filter will take care of the rest.

If this was something I haven't experienced, I would just shut up and say nothing but the people I have helped with these filters all have perfectly good flowhoods. Static pressure is not the only reason why we get laminar flow, it's just as easy as that. Saying inaccurate shit is not going to help anybody, stick to what you know and we're good.

The people who say that 12" filters won't create laminar flow are merely following the advice that was laid down years ago when people were not sure of what would happen. There have been hundreds of successful builds since then and so we learned. I can quote you a user who used to recommend nothing but 12" filters for FHs and although I don't agree with his choice, I understand where he is coming from. 12" filters are cheaper and the blower required will be smaller, saving money all around.




Again, your just being contrary and obviously didn't read my last post.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23449815 - 07/17/16 12:54 PM (7 years, 6 months ago)

Dude, you have 6,000 comments in less than 8 months on this site, when in the fuck do you even have time to even use a flowhood, let alone build one?
And what exactly would a new grower like you even need a flowhoood for?
I guess you just can't let that HVAC expertise(copy pasting) go to waste.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23451140 - 07/17/16 08:37 PM (7 years, 6 months ago)

Oh I read your post, you're just trying to climb out of the hole you dug though.

So, since you seem to be such an expert tell me, why does a 12" filter have more resistance that a 6"? Quote me some Lipa again if you can or just straight up ask him. Also, ask him what's the difference between laminar flow and true laminar flow. Don't worry, I'll wait. He might just laugh his ass off if you actually try.

Unfortunately for you and your silly argument, there isn't a single quote in my comments. Go ahead, google them and see for yourself. Every single thing I posted, I learned through actual experience.

I see you are jealous of my post count for some wierd reason. NEWSFLASH: post count means nothing except for the willingness to learn and to teach. You have gotta learn before you can actually start teaching, that's something you still have to learn it seems like. I actually stalk these forums to be able to learn enough to correct the bullshit being spewed out in threads like this. I'm sure OP appreciates that, he wouldn't have bypassed said bullshit and PMed me if he didn't.

:melt:

So I guess we'll just wait till OP builds his hood and let him tell us if he has laminar flow, "true" or otherwise. :rofl:


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23451424 - 07/17/16 10:27 PM (7 years, 6 months ago)

Dude, I doubt you even have a flowhood, stop acting like you know ANYTHING really about this shit. Are you an HVAC engineer or armchair cube grower? Get a life bro, your not helping or teaching anybody out there trolling and waiting for stupid questions so you could post up your faggy emojis.
And the OP has also been messaging me, guess what I told him 12" filters rock and go for it, which is what I have said this whole fucking time dumbass. But most of all haze, I want you to know I am truly sorry, I didn't know you had rewritten the book on flowhoods in the last year or so sense RR left, If I had known that I wouldn't have said what I said.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23451540 - 07/17/16 11:32 PM (7 years, 6 months ago)

Don't have to be a mechanic to change a car's oil. Don't have to be a chef to cook pasta. Your arguments are empty. You built a hood and by what you've been saying here you're sure as shit not an HVAC engineer.

Quote:

Marty Mycfly said:
stop acting like you know ANYTHING really about this shit.




Quote:

Marty Mycfly said:
a stronger fan is needed for a 12" thick filter.




Quote:

Marty Mycfly said:
With 12" filters and fans it's all open for debate, they are not true laminar flow but work fine




:thatsinteresting:

Funny, it seems like you were describing yourself in that post.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23451707 - 07/18/16 01:30 AM (7 years, 6 months ago)

I just described what is talked about over and over again, about 12" filters not being able to produce a laminar flow, yet I gave my input about having a good experience with a 12" filter, you gave your input, yet you took that as an argument, why? I don't know, I don't even really believe you have a flowhood, you said you built it last year and have only been growing since what, October? What have you grown a few monotubs? Why even bother with a flowhood?


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23451959 - 07/18/16 06:44 AM (7 years, 6 months ago)

I don't really have to explain myself to you. I don't give a F what you believe, speak about what you know.

Going around like a broken stereo or a parrot repeating everything and anything you hear is bound to get you to say something inaccurate, I merely corrected you. No need to have a :meltdown:.

As I've said multiple times and as even munxpunx agreed to, a proper functioning flowhood must have laminar flow. Having a 12" filter for your flowhood you should know pretty damn well that it's laminar. If it wasn't, you would be growing nothing but molds. That's not speculation, that a fact. Sterile air means jack shit if the flow isn't laminar.

Stop trying to win an argument you already lost in the last page for god's sake. Just admit that what you said was inaccurate, learn from your mistake and teach others. Or don't but at least STFU about it, you ain't getting any medals for making yourself look even more bad.

:hatsoff: There you have it.


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23452024 - 07/18/16 07:32 AM (7 years, 6 months ago)

Its true. 

The reason the flow needs to be laminar is so that any falling contams get trapped in the screen and pushed forwards perpendicular , rather than settling into your open containers.

The air has to be sterile tho of course because otherwise you'd be blowing all sorts of contams right in.

If you say, move a dirty hand between the filter and your open container, it will let contams in. But if you moved a dirty hand *over top* an open container the laminar flow would push them away and not let them settle


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Re: HEPA filter selection [Re: Supalemonhaze]
    #23453040 - 07/18/16 02:02 PM (7 years, 6 months ago)

That's the thing Im not really sure you are talking about what "you know". To use words commonly used around here, pictures or it didnt happen, let's see your hood and all of the other ones you have been building. I will stop here, I got a warning message about my language from pussyfart that you reported me, sorry I called your emojis f***y.


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Edited by Marty Mycfly (07/18/16 02:05 PM)


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23453076 - 07/18/16 02:11 PM (7 years, 6 months ago)

both of you have given me a tremendous amount of helpful information. I will be going with the 24" x 24" x 12" filter with a 12" (at least) plenum behind it, with a ~450cfm blower at a 90degree angle to the filter.


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Re: HEPA filter selection [Re: Marty Mycfly]
    #23454705 - 07/18/16 11:39 PM (7 years, 6 months ago)

Quote:

Marty Mycfly said:
That's the thing Im not really sure you are talking about what "you know". To use words commonly used around here, pictures or it didnt happen, let's see your hood and all of the other ones you have been building. I will stop here, I got a warning message about my language from pussyfart that you reported me, sorry I called your emojis f***y.





Actually, I think you got called out for calling people who correct you "dummasses". That doesn't go down too well with the community.


You know, I actually have a brain and I know I did post pics of my FH exactly 4 posts above. I don't have to prove myself to you, what I say has logic to back it up, I have yet to see you prove how a 12" filter has more resistance or what's the difference between laminar flow and true laminar flow. Let's start by seeing you prove those two ridiculous statements before I go out of my way to bother the folks I helped with the 12" to come here and satisfy your skepticism.

:tard: :raisemyglass:


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Re: HEPA filter selection [Re: joshxjosh]
    #23458156 - 07/20/16 12:17 AM (7 years, 6 months ago)

Quote:

joshxjosh said:
both of you have given me a tremendous amount of helpful information. I will be going with the 24" x 24" x 12" filter with a 12" (at least) plenum behind it, with a ~450cfm blower at a 90degree angle to the filter.





You need a blower that is 400CFM AT an SP of 1.2 minimum

If you just buy a blower listed at "450CFM" its going to be way too tiny, because that is 450CFM @ free air...


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Re: HEPA filter selection [Re: mushpunx]
    #23458408 - 07/20/16 03:37 AM (7 years, 6 months ago)

I worked it out for him through pms. His filter is 12" so it won't be operating at 1.2" w.g. It's like 440cfm @ 0.2" w.g without the prefilter included. The fungifun guide uses another hepa for a prefilter so 0.2 is kinda overkill for less quality pre filters. But approximately, it's 440cfm @0.3-4" w.g, depending on the pre-filter. I think something like the filterete like you guys like to use shouldn't be more than 0.1w.g



That's the chart for his filter. Since 100linear fpm = 400cfm. On the chart you can see that with 400cfm of flow behind the filter, the s.p will be ~0.2". Add the 10% for friction and blower inaccuracies and it's 440cfm @ 0.2"w.g for the hepa alone.


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