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Offlinemagicschoolbus
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Registered: 02/19/18
Posts: 160
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Last seen: 9 months, 2 days
Help with Flowhood build, confused about WG, SP, CPMs...
    #26349194 - 11/27/19 05:53 PM (4 years, 2 months ago)

I've decided I'll go the DIY route instead of buying a prefab flowhood, but I can't find any consistancy across any of the specs I'm looking at. Here's the blowers I have considered:

Blowers:
https://www.zoro.com/dayton-blower-549-cfm-115v-205a-1640-rpm-1tdt2/i/G1061216/

https://www.zoro.com/dayton-blower-549-cfm-115v-205a-1640-rpm-1tdt2/i/G1061216/

Filters:
https://www.ebay.com/itm/nib-flanders-0-007-c-19-03-iu-12-00-ge-d-hepa-air-conditioning-filter-24-x-18/401144716052?hash=item5d66169b14:g:akwAAMXQhuVRLPvm

https://www.ebay.com/itm/NEW-FILTRA-CORPORATION-262202G-01-LF-PANEL-HEPA-24-x-24-X-5-875-99-99-Eff/223672054691?hash=item3413e4b3a3:g:-CIAAOSwxXldgjda

https://www.ebay.com/itm/1-ONLY-24-X12-X6-HEPPA-ULPA-FILTER-Flanders-0-007-4-0-00300-Penetration/233379404658?hash=item36567f1b72:g:AywAAOSwc7tdsfJV

-------

I'd really like to get the higher CPM blower I have linked since I would also like to use a pre-filter and most people are recommending to go higher than lower as a margin of safety. Also the blower that you can find on FP is listed at 540 CPM and costs $209, so I figure these two blowers I have listed should do the job considering they're both around that mark, and are cheaper anyway. The spec sheets on zoro however don't have anything written next to their rating at 1.0 SP but are at least 330+ at 0.8 which is the closest to 1.0SP listed.

Now I look at the filters I linked, and I'm also confused, one of them says resistance "-- .49 in w.g test flow -- 260 cfm" and I don't really know what to make of that description. The second listing appears to say "1.0 WG at 559 CFM" or maybe it says 659, I can't really read what it says the picture isn't clear enough. Now the 3rd listing says ".30 WG at 162 CFM" which again, I don't really know what to make of that description.

Sorry, I'm just a little confused about all the descriptions in WG and CFMs listed under the filters and blowers I've linked and would just like to know what the best purchase would be here.

The 24x18x6 filter would be ideal, 24x12x6 I'd be okay with as I only plan to use plates and jars and don't plan to use any spawn bags which I know you might want something bigger for. That being said, the 24x24 would be my last choice but I'd still consider it if it's the best option with the specs given.


--------------------
:trippinballs::trippinballs:


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Offlinemagicschoolbus
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Registered: 02/19/18
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: magicschoolbus]
    #26349569 - 11/27/19 09:35 PM (4 years, 2 months ago)

Update: actually think the blowers I listed might be too underpowered, but came across this one and believe this should be good for anything 24x24 and under? Still really not sure where to pull the trigger in terms of filters

https://www.zoro.com/dayton-blower-797549-cfm-115v-330220a-1tdt8/i/G2089263/


--------------------
:trippinballs::trippinballs:


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OfflineSFS96
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: magicschoolbus]
    #26349611 - 11/27/19 09:57 PM (4 years, 2 months ago)

You should figure out which filter you want and get the specs on it before getting your blower. You will likely need the Dayton 1TDU1 or the bigger 1TDU2 depending on the filter you get.


--------------------
How I make and preserve tea


Consuming consumes a man That was never a purpose of life To only crave for material joys Is believing the lie - Mellow Mood


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InvisibleYogiBear
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: SFS96]
    #26349937 - 11/28/19 04:57 AM (4 years, 2 months ago)

Quote:

SFS96 said:
You should figure out which filter you want and get the specs on it before getting your blower. You will likely need the Dayton 1TDU1 or the bigger 1TDU2 depending on the filter you get.



:whathesaid:

I got this combo from fungi perfecti
Just need to build my box now 👍



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OfflineAegis
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: YogiBear]
    #26349969 - 11/28/19 05:46 AM (4 years, 2 months ago)

You will need to decide on a filter first.

Side note: you will likely never need the Dayton 1tdu2 unless you're using a very small flowhood.. I dont know why everyone recommends those beasts, way way way too powerful. The 1tdu2 flows near  and above 1000 cfm all the way up to 1.5"w.c.

For a 24x24 filter you would need around 1.75" of restriction to get it down to 100 fpm with the 1tdu2

Edit: i just realized 2 of the filters you reference are small, in that case, yes the 1tdu2 is an option. Sorry biut that all i saw was 24"x24".


--------------------
"We are told 'no', we're unimportant, we're peripheral. 'Get a degree, get a job, get a this, get a that.' And then you're a player, you don't want to even play in that game. You want to reclaim your mind and get it out of the hands of the cultural engineers who want to turn you into a half-baked moron consuming all this trash that's being manufactured out of the bones of a dying world.” - T. Mckenna


Edited by Aegis (11/28/19 09:03 AM)


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OfflineAegis
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: magicschoolbus] * 1
    #26350067 - 11/28/19 07:18 AM (4 years, 2 months ago)

Quote:

magicschoolbus said:
I've decided I'll go the DIY route instead of buying a prefab flowhood, but I can't find any consistancy across any of the specs I'm looking at. Here's the blowers I have considered:

Blowers:
https://www.zoro.com/dayton-blower-549-cfm-115v-205a-1640-rpm-1tdt2/i/G1061216/

https://www.zoro.com/dayton-blower-549-cfm-115v-205a-1640-rpm-1tdt2/i/G1061216/

Filters:
https://www.ebay.com/itm/nib-flanders-0-007-c-19-03-iu-12-00-ge-d-hepa-air-conditioning-filter-24-x-18/401144716052?hash=item5d66169b14:g:akwAAMXQhuVRLPvm

https://www.ebay.com/itm/NEW-FILTRA-CORPORATION-262202G-01-LF-PANEL-HEPA-24-x-24-X-5-875-99-99-Eff/223672054691?hash=item3413e4b3a3:g:-CIAAOSwxXldgjda

https://www.ebay.com/itm/1-ONLY-24-X12-X6-HEPPA-ULPA-FILTER-Flanders-0-007-4-0-00300-Penetration/233379404658?hash=item36567f1b72:g:AywAAOSwc7tdsfJV

-------

I'd really like to get the higher CPM blower I have linked since I would also like to use a pre-filter and most people are recommending to go higher than lower as a margin of safety. Also the blower that you can find on FP is listed at 540 CPM and costs $209, so I figure these two blowers I have listed should do the job considering they're both around that mark, and are cheaper anyway. The spec sheets on zoro however don't have anything written next to their rating at 1.0 SP but are at least 330+ at 0.8 which is the closest to 1.0SP listed.

Now I look at the filters I linked, and I'm also confused, one of them says resistance "-- .49 in w.g test flow -- 260 cfm" and I don't really know what to make of that description. The second listing appears to say "1.0 WG at 559 CFM" or maybe it says 659, I can't really read what it says the picture isn't clear enough. Now the 3rd listing says ".30 WG at 162 CFM" which again, I don't really know what to make of that description.

Sorry, I'm just a little confused about all the descriptions in WG and CFMs listed under the filters and blowers I've linked and would just like to know what the best purchase would be here.

The 24x18x6 filter would be ideal, 24x12x6 I'd be okay with as I only plan to use plates and jars and don't plan to use any spawn bags which I know you might want something bigger for. That being said, the 24x24 would be my last choice but I'd still consider it if it's the best option with the specs given.



Those flow volume @ "x" w.g. numbers you listed are test data. It's saying that, for example; the one filter is rated .49 Iwg @ 260 cfm.

What that means is that when 260 cfm is flowed through the filter it created a pressure drop of .49 Iwc. Iwc. (Inches water column) & Iwg (inches water gauge) are same thing just different terms, usually written short hand as "wg" or "wc".

Those numbers are s.p. (static pressure). Static pressure is simply "pressure" that's it, its that simple.

It's confusing because it's a term used to differentiate it from other types of pressure in fluid dynamics such as dynamic pressure (velocity pressure) which can be dedcribed as the increase in a moving fluid's pressure over its static value due to motion. Or in other words dynamic pressure is its kinetic enery per unit\volume.

You dont need to worry about that but just know that the term "static pressure" is simply just pressure, and it's a term used clarify that the person is saying measureabl pressure @ any point and not dynamic\velocity, or total pressure.


--------------------
"We are told 'no', we're unimportant, we're peripheral. 'Get a degree, get a job, get a this, get a that.' And then you're a player, you don't want to even play in that game. You want to reclaim your mind and get it out of the hands of the cultural engineers who want to turn you into a half-baked moron consuming all this trash that's being manufactured out of the bones of a dying world.” - T. Mckenna


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Offlinemagicschoolbus
I'm a teapot User Gallery


Registered: 02/19/18
Posts: 160
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Last seen: 9 months, 2 days
Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: YogiBear]
    #26350120 - 11/28/19 07:52 AM (4 years, 2 months ago)

Quote:

YogiBear said:
Quote:

SFS96 said:
You should figure out which filter you want and get the specs on it before getting your blower. You will likely need the Dayton 1TDU1 or the bigger 1TDU2 depending on the filter you get.



:whathesaid:

I got this combo from fungi perfecti
Just need to build my box now 👍





Unfortunately all their filters are out of stock

I got a headache trying to find a suitable filter, I was told none of the ones I linked are any good, but I found all of them on Fungifun on their flowhood article :confused:


--------------------
:trippinballs::trippinballs:


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OfflineAegis
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: magicschoolbus]
    #26350133 - 11/28/19 08:02 AM (4 years, 2 months ago)

Who told you that? Any of those filters you posted are fine. Comes down to personal preference really. I would suggest @ least 24" height x however wide you'd like.


--------------------
"We are told 'no', we're unimportant, we're peripheral. 'Get a degree, get a job, get a this, get a that.' And then you're a player, you don't want to even play in that game. You want to reclaim your mind and get it out of the hands of the cultural engineers who want to turn you into a half-baked moron consuming all this trash that's being manufactured out of the bones of a dying world.” - T. Mckenna


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InvisibleYogiBear
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Registered: 08/24/19
Posts: 845
Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: magicschoolbus]
    #26350310 - 11/28/19 09:55 AM (4 years, 2 months ago)

Quote:

magicschoolbus said:
Quote:

YogiBear said:
Quote:

SFS96 said:
You should figure out which filter you want and get the specs on it before getting your blower. You will likely need the Dayton 1TDU1 or the bigger 1TDU2 depending on the filter you get.



:whathesaid:

I got this combo from fungi perfecti
Just need to build my box now 👍





Unfortunately all their filters are out of stock

I got a headache trying to find a suitable filter, I was told none of the ones I linked are any good, but I found all of them on Fungifun on their flowhood article :confused:




Bummer they ran out. Guess I got mine in time before the holiday rush.

Keep doing research and putting ideas here. Some really good people here that know their stuff about flow hoods.


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InvisibleYogiBear
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: Aegis]
    #26350326 - 11/28/19 10:03 AM (4 years, 2 months ago)

Quote:

Aegis said:
Who told you that? Any of those filters you posted are fine. Comes down to personal preference really. I would suggest @ least 24" height x however wide you'd like.




I went with the 12x24 because Im going to get a small cannabis grow tent for a clean room. Figured it would scrub the air enough to make up for the size difference in the filter.


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OfflineSFS96
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: YogiBear]
    #26350392 - 11/28/19 10:46 AM (4 years, 2 months ago)

Go to eBay and type in Flanders Hepa. There’s some really good deals right now. You can even get a 2x4 filter for less than 250.


--------------------
How I make and preserve tea


Consuming consumes a man That was never a purpose of life To only crave for material joys Is believing the lie - Mellow Mood


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OfflineeLeSDenes
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: Aegis]
    #26356477 - 12/02/19 12:12 AM (4 years, 2 months ago)

Quote:

Aegis said:
Who told you that? Any of those filters you posted are fine. Comes down to personal preference really. I would suggest @ least 24" height x however wide you'd like.





No, you need a filter with at least a pressure of 1.0w.g or higher to achieve good laminar flow. The first filter only seem to do 0.49wg, did not see anything for the other 2. The third one looks the best but someone on the forum said that for some reason ULPA filters suck, which is of course might not be true (need confirmation on this), but I usually go fo the sure thing.
When I bought my filter I just told the filter company that I need a filter with x measurements and a pressure of about 250pa (~1.0wg) and I need about H14 filtration quality which is 99.995%.  It was much easier than buy something from someone who does not know what he is selling.


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OfflineSFS96
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: eLeSDenes]
    #26356581 - 12/02/19 02:12 AM (4 years, 2 months ago)

Actually they don’t have to have a w.g. of 1.0 for laminar flow. If you look around there’s many new flowhood builds with people using filter with a low w.g.


--------------------
How I make and preserve tea


Consuming consumes a man That was never a purpose of life To only crave for material joys Is believing the lie - Mellow Mood


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OfflineeLeSDenes
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: SFS96]
    #26356593 - 12/02/19 02:44 AM (4 years, 2 months ago)

That is good to know, but I would not spend hundreds to find out if that particular filter will work at less than 1 w.g. Things might have changed but RR used to say that at least 1 w.g. required.
I have built 2 flowhoods with this setup and I know for a fact that they work.


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OfflineAegis
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: eLeSDenes]
    #26363938 - 12/05/19 09:40 PM (4 years, 2 months ago)

My flowhood operates @ a calculated .391"wc. And I experience a 1-2% contamination rate.


--------------------
"We are told 'no', we're unimportant, we're peripheral. 'Get a degree, get a job, get a this, get a that.' And then you're a player, you don't want to even play in that game. You want to reclaim your mind and get it out of the hands of the cultural engineers who want to turn you into a half-baked moron consuming all this trash that's being manufactured out of the bones of a dying world.” - T. Mckenna


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OfflineeLeSDenes
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: Aegis]
    #26364102 - 12/06/19 01:05 AM (4 years, 2 months ago)

if that is the contamination rate with agar then it's a bit shit, but if from 100 subs you have 1-2 contaminated, well done!
It is hard to know whether it is your filter or your technique which causes the 1-2% but this number in a commercial farm would be terrible.


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OfflineAegis
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: eLeSDenes]
    #26364422 - 12/06/19 07:16 AM (4 years, 2 months ago)

Its 1 M.S. plate in the 73 that ive ran so far,  and that could have been my fault or contaminated syringe, but that is a contam either way, so it's the number i use to calc contam rate. None of my clean transfers contam, just one M.S. plate And no, 1% isn't anywhere near "shit".


Edited by Aegis (12/06/19 07:30 AM)


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OfflineSFS96
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: Aegis]
    #26364441 - 12/06/19 07:32 AM (4 years, 2 months ago)

Yeah I don’t see how 1% contamination is shit:shrug:


--------------------
How I make and preserve tea


Consuming consumes a man That was never a purpose of life To only crave for material joys Is believing the lie - Mellow Mood


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OfflineeLeSDenes
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: Aegis]
    #26365251 - 12/06/19 02:59 PM (4 years, 2 months ago)

MS does not count as that is sort of out of your control. I might have high expectations but I almost never see any contamination when doing agar transfers from clean culture.
The point I was trying to make is not that your sterile technique is shit, it is that either the flowhood is letting through contaminants or the pressure of your filter is only 0.4w.g thus not achieving proper laminar flow.
I am sorry man wasn't trying to criticise your work was just simply trying to compare that rate for commercial grows.


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OfflineAegis
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Re: Help with Flowhood build, confused about WG, SP, CPMs... [Re: eLeSDenes]
    #26365315 - 12/06/19 03:26 PM (4 years, 2 months ago)

No offense taken. I'm not a believer in the 1" S.P. rule either. Way to many people using filters that dont achieve 1" that work perfectly. Uniform flow is uniform flow at any pressure.


--------------------
"We are told 'no', we're unimportant, we're peripheral. 'Get a degree, get a job, get a this, get a that.' And then you're a player, you don't want to even play in that game. You want to reclaim your mind and get it out of the hands of the cultural engineers who want to turn you into a half-baked moron consuming all this trash that's being manufactured out of the bones of a dying world.” - T. Mckenna


Extras: Filter Print Post Top
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