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Offlinemicrodose83
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Flow hood question
    #26676577 - 05/17/20 10:01 AM (3 years, 8 months ago)

Hey shroomies,
I'm planning to build a flow hood and am trying to match a blower to it,. I've read multiple build and Tek posts and all the math and everything etc....  But I'm still confused about the blower. For my filter I have the specs and everything rate the sp drop tested at 1500cfm. But by the math I've seen the formula is 2x2=4ftΒ² then adding the 100cfm flow rate out needed equals out to 400cfm?  So I'm confused whether I need a 1500cfm blower to aquire the intended laminar flow or if the 400cmf would be sufficient. I've found some online filters with adjustable cfm that go up to 1500cfm but if I only need 400cfm I can save alot of $ haha. Any help would be appreciated.


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Offlinemushpunx
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Re: Flow hood question [Re: microdose83]
    #26676737 - 05/17/20 11:43 AM (3 years, 8 months ago)

First you need the flow chart of your filter to find out the static pressure (at the working point of your filter).
It's usually .8 - 1.2sp

For a 24 x 24" filter you need a blower that pushes 400cfm @ the static pressure of your filter (+ .2sp for your prefilter).

So you need to find the blower specs, and figure out what CFM your blower pushes at the static pressure you need.

Example:

My filter face size is 12 x 24". It has a static pressure of .8
I need at the very least 200cfm @ 1.0sp (.8 + .2 for prefilter)
The blower I have is listed as a 549CFM blower. That's what it pushes at free air (0.0).

I check the specs, at .8sp my blower pushes 360CFM, at 1.0sp it pushes 240cfm.
So this blower is a match, and it's pretty close so I don't need to power it down.


For a 24 x 24, a Dayton 1TDU2 is plenty powerful. You will just have to stack prefilters or block the intake some to power it down a bit.


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Edited by mushpunx (05/17/20 11:57 AM)


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Offlinemicrodose83
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Re: Flow hood question [Re: mushpunx]
    #26676767 - 05/17/20 12:00 PM (3 years, 8 months ago)

Quote:

mushpunx said:
First you need the flow chart of your filter to find out the static pressure (at the working point of your filter).
It's usually .8 - 1.2sp

For a 24 x 24" filter you need a blower that pushes 400cfm @ the static pressure of your filter (+ .2sp for your prefilter).
https://www.ecomfort.com/manuals/flanders_alpha_2000_brochure.pdf
So you need to find the blower specs, and figure out what CFM your blower pushes at the static pressure you need.

Example:

My filter face size is 12 x 24". It has a static pressure of .8
I need at the very least 200cfm @ 1.0sp (.8 + .2 for prefilter)
The blower I have is listed as a 549CFM blower. That's what it pushes at free air (0.0).

I check the specs, at .8sp my blower pushes 360CFM, at 1.0sp it pushes 240cfm.
So this blower is a match, and it's pretty close so I don't need to power it down.


For a 24 x 24, a Dayton 1TDU2 is plenty powerful. You will just have to stack prefilters or block the intake some to power it down a bit.





Thanks so much!  Here's a manual for the brand of filter bit I'm not sure if it's the same as the filter I have or not. It's all sort of jibberish to me haha. I'm horrible at math but really want to learn more about it all!
https://www.ecomfort.com/manuals/flanders_efficiency_guide.pdf


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Offlinemushpunx
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Re: Flow hood question [Re: microdose83]
    #26676795 - 05/17/20 12:21 PM (3 years, 8 months ago)

Well to find out the Static pressure of your filter at 400cfm you really need the flow chart for it.

The blower model I recommended for you will be more than powerful enough so it shouldn't really matter.

You want a more powerful blower anyways, over time the filter will start to get clogged up and you want a blower that will be able to handle that.

My blower pushes 240cfm with the prefilter and that is pretty close so eventually I may have to run it without the pre filter when it gets clogged... That's years down the road hopefully


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Offlinemicrodose83
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Re: Flow hood question [Re: mushpunx]
    #26676815 - 05/17/20 12:36 PM (3 years, 8 months ago)

Right on I'll search for a flow chart for it haha. I deeply appreciate your help. And as far as your prefilter, are you using another expensive high quality filter or just a plain Jane prefilter. And if instead of running it without a prefilter and decreasing the life of your HEPA could you possibly add another filter infront of the prefilter. Sorta like filter fabric maybe?  They're not hard to draw through at all and would extend the life of both of your more expensive filters no?


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Offlinemicrodose83
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Re: Flow hood question [Re: microdose83]
    #26676855 - 05/17/20 01:03 PM (3 years, 8 months ago)



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Re: Flow hood question [Re: microdose83]
    #26676861 - 05/17/20 01:05 PM (3 years, 8 months ago)

I agree with Mushpunx, it's better to be overpowered as you can decrease the flow by adding more pre-filter material.


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Offlinemicrodose83
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Re: Flow hood question [Re: microdose83]
    #26676890 - 05/17/20 01:21 PM (3 years, 8 months ago)

Just a google search is saying it has a 1" pressure drop @ 1500cfm



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Offlinemicrodose83
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Re: Flow hood question [Re: Cpt_Hyman_Shocker]
    #26676891 - 05/17/20 01:21 PM (3 years, 8 months ago)

Quote:

Cpt_Hyman_Shocker said:
I agree with Mushpunx, it's better to be overpowered as you can decrease the flow by adding more pre-filter material.





I agree as well! Haha. I just wanna make sure whatever I choose is overpowered haha


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Re: Flow hood question [Re: Cpt_Hyman_Shocker]
    #26676900 - 05/17/20 01:25 PM (3 years, 8 months ago)

Adding static pressure will work but it's not very efficient.  I recommend finding something as close to specs as possible for longevity. Why buy something potentially expensive just to stress the motor unnecessarily. Using that rationale there's really no point in finding a matching blower because prefilters can be added or subtracted ad infinitum.

You need to find the static pressure at 400-480 cfm, not what it is at 1500.


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Offlinemicrodose83
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Re: Flow hood question [Re: Stipe-n Cap]
    #26676930 - 05/17/20 01:39 PM (3 years, 8 months ago)

Quote:

p9hu7 said:
Adding static pressure will work but it's not very efficient.  I recommend finding something as close to specs as possible for longevity. Why buy something potentially expensive just to stress the motor unnecessarily. Using that rationale there's really no point in finding a matching blower because prefilters can be added or subtracted ad infinitum.

You need to find the static pressure at 400-480 cfm, not what it is at 1500.



So between all these chats and whatnot 400-480cfm is the ideal cfm not the 1500cfm the graph on Joe w fly company suggested?


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Offlinemicrodose83
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Re: Flow hood question [Re: microdose83]
    #26676935 - 05/17/20 01:41 PM (3 years, 8 months ago)

I do apologise for all the questions and whatnot. I'm horrible at math and unless I get it explained to me and then confirmed I'm rubbish. And info appreciate everyone's help!


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Offlinemicrodose83
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Re: Flow hood question [Re: microdose83]
    #26676950 - 05/17/20 01:50 PM (3 years, 8 months ago)

I did find this blower.  It has an adjustment speed for it. This should cover all the bases if think as long as it don't have a massive pressure drop when resistance is added. But in the same breath it is designed for pulling air through a charcoal filter. But I know pulling air is easier than pushing as well lol. Ugh my head hurts! Hahaha



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Re: Flow hood question [Re: microdose83]
    #26676951 - 05/17/20 01:51 PM (3 years, 8 months ago)

400-480 is what you would want for any 2x2 filter because they have 4Β²' of surface area. 100ft/minΓ—4ftΒ²= 400CFM add 20% of wiggle room and that's 400-480CFM. The chart (as mushpunx mentioned) will have a line on it like this:



That's the chart for my filter, my filter is represented by the green line, I've added the red line to show where SP intersects at 100ft/min. That chart shows .5"SP @ 100ft/min, this is what you need to do with your filter.

It's not helpful to know what SP you have at 1500CFM if you need 400-480. You can't match a blower until you have that information. Just download the .pdf for your filter and look under "specs" the chart should be in there. If you have an issue reading it just post it here and we will be able to sort it out.


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Offlinemicrodose83
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Re: Flow hood question [Re: Stipe-n Cap]
    #26676967 - 05/17/20 02:01 PM (3 years, 8 months ago)

Quote:

p9hu7 said:
400-480 is what you would want for any 2x2 filter because they have 4Β²' of surface area. 100ft/minΓ—4ftΒ²= 400CFM add 20% of wiggle room and that's 400-480CFM. The chart (as mushpunx mentioned) will have a line on it like this:



That's the chart for my filter, my filter is represented by the green line, I've added the red line to show where SP intersects at 100ft/min. That chart shows .5"SP @ 100ft/min, this is what you need to do with your filter.

It's not helpful to know what SP you have at 1500CFM if you need 400-480. You can't match a blower until you have that information. Just download the .pdf for your filter and look under "specs" the chart should be in there. If you have an issue reading it just post it here and we will be able to sort it out.




Yeah I've read about a 2x2 usually requiring a 400cfm filter because of the math and the charts were in the links above. But they were also confusing me haha. Because on the left it shows the cfm and pressure drop which claimed roughly 1500cfm for 1"sp and on the right it was showing that 400cfm was providing the 1"so. So it was confusing the hell out of me and that's why I decided to reach out lol. And maybe go back to school now lmafo!


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Re: Flow hood question [Re: microdose83]
    #26676988 - 05/17/20 02:09 PM (3 years, 8 months ago)

So it look's like you have .2"SP @100CFM, now if you use a standard 1" thick furnace filter as prefilter they are ~.4"SP....your blower will need to push 400-480CFM (call it 500 for ease of application) @ .6" of static pressure.

This is not an exhaustive list obviously but may be useful to Check out for reference:

FG 10XL 503 CFM @ .6"SP
https://shop.fantech.net/en-CA/fg--10xl--centrif--inline--fan/p106496

Dayton 3HMJ2 435 CFM @ .6"SP
https://www.grainger.com/mobile/product/DAYTON-OEM-Blower-3HMJ2?fc=MWP2IDP2PCP


Dayton 1TDT4 562 CFM@ .6"SP
https://www.grainger.com/mobile/product/DAYTON-OEM-Blower-1TDT4?fc=MWP2IDP2PCP


You can't buy directly from Grainger and likely not from fantech either, just google them and search amazon, ebay and the like for sources that sell to the public, I found mine on Amazon so you might get lucky there.


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Offlinemicrodose83
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Re: Flow hood question [Re: Stipe-n Cap]
    #26677009 - 05/17/20 02:19 PM (3 years, 8 months ago)

Quote:

p9hu7 said:
So it look's like you have .2"SP @100CFM, now if you use a standard 1" thick furnace filter as prefilter they are ~.4"SP....your blower will need to push 400-480CFM (call it 500 for ease of application) @ .6" of static pressure.

This is not an exhaustive list obviously but may be useful to Check out for reference:

FG 10XL 503 CFM @ .6"SP
https://shop.fantech.net/en-CA/fg--10xl--centrif--inline--fan/p106496

Dayton 3HMJ2 435 CFM @ .6"SP
https://www.grainger.com/mobile/product/DAYTON-OEM-Blower-3HMJ2?fc=MWP2IDP2PCP


Dayton 1TDT4 562 CFM@ .6"SP
https://www.grainger.com/mobile/product/DAYTON-OEM-Blower-1TDT4?fc=MWP2IDP2PCP


You can't buy directly from Grainger and likely not from fantech either, just google them and search amazon, ebay and the like for sources that sell to the public, I found mine on Amazon so you might get lucky there.



Awesome man!  I can't thank you enough. And all of you who've posted as well!  I just felt dyslexic looking at these charts and all the math haha. So I had to reach out, even though I know this has been a question asked a million times in here. But you explaining that last part really helped every thing kinda click. Even if it was only one miniscule click haha!  Again thanks for all the help!  It means the world to me!  If you see anything in my trade list that tickles your fancy let me know. I would be more than happy to send you a swab or print for all of your help and patience!


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Re: Flow hood question [Re: microdose83]
    #26677015 - 05/17/20 02:22 PM (3 years, 8 months ago)

It's  a lot easier when you see the relationship between the flow rate  chart for your filter and the chart for your blower. :thumbup:


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Offlinemicrodose83
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Re: Flow hood question [Re: Stipe-n Cap]
    #26677025 - 05/17/20 02:29 PM (3 years, 8 months ago)

Quote:

p9hu7 said:
It's  a lot easier when you see the relationship between the flow rate  chart for your filter and the chart for your blower. :thumbup:



Agreed!  And when you have someone to hold your hand!  :grin: :yourock::cheers:


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