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OfflineGomedics2513
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Registered: 06/03/22
Posts: 5
Last seen: 2 years, 7 months
Hepa filter build. Food for thought. * 1
    #27803760 - 06/03/22 05:54 AM (2 years, 7 months ago)

Ok. So I'm doing the dangerous task of looking up laminar flow hoods. Super expensive. But the more I look at these builds the more I think, how on earth do so many ppl have issues building one? Like anyone who posts an idea on here that isn't to build a huge wood box that's all technical and hard and expensive, they get shut down. But the concept seems basic. My question is basically this. If I take a 12x12x6 true hepa 14 filter. And cut out the top of a sewlaed storage tote, mounting the filter into the cut square. Then taking it and laying it on its side so the lid and the filter are facing you. After this, mount a 4 inch inline fan into the top (side) of the tub cutting a 4 inch hole in it and sticking fan in there so irs point downwards at the ground when blowing. All laminar flow hoods seem to be is the right filter. And a fan pushing air into a box but not directly at the filter event hough alot I see online have fans in the back blowing right at the filter. I don't know if this description works well enough but will post pics with the materials I would use. But wouldn't this work the exact same? Thanks for any reply guys.

Filter
https://filtrasupply.com/products/aercology-1b222603?_pos=2&_sid=e165b23ca&_ss=r

Fan
https://www.amazon.com/VIVOSUN-Inline-Ventilation-Variable-Controller/dp/B01DXYMGOM/ref=mp_s_a_1_6?crid=3RWIRW78MRAZQ&keywords=4+inch+inline+fan&qid=1654258737&sprefix=4+inch+inline+fan+%2Caps%2C157&sr=8-6

Tote
https://www.amazon.com/IRIS-USA-Inc-WEATHERTIGHT-Storage/dp/B084DY21D6/ref=mp_s_a_1_10?crid=YB8AGMGAANF8&keywords=Large+tote+with+sealed+top&qid=1654258770&sprefix=large+tote+with+sealed+top%2Caps%2C130&sr=8-10


Edited by Gomedics2513 (06/03/22 06:20 AM)

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OfflineBobbins
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Registered: 02/02/22
Posts: 445
Last seen: 2 years, 3 months
Re: Hepa filter build. Food for thought. [Re: Gomedics2513]
    #27803769 - 06/03/22 06:12 AM (2 years, 7 months ago)

There are heaps of builds for DIY laminar flow hoods, most people were doing this until FFUs emerged at least. Have a dig around the site and wider internet for many plans and all the calculations you need regarding pairing the right fan and filter.


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DeALeRsHrOoMs

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OfflineGomedics2513
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Registered: 06/03/22
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Last seen: 2 years, 7 months
Re: Hepa filter build. Food for thought. [Re: Bobbins]
    #27803774 - 06/03/22 06:20 AM (2 years, 7 months ago)

Also, what are ffu's?

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OfflineGomedics2513
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Registered: 06/03/22
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Last seen: 2 years, 7 months
Re: Hepa filter build. Food for thought. [Re: Bobbins]
    #27803775 - 06/03/22 06:21 AM (2 years, 7 months ago)

And did the diy setups use plastic tote and the same idea I am? And it works?

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Invisiblesandman420
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Re: Hepa filter build. Food for thought. [Re: Gomedics2513] * 1
    #27803791 - 06/03/22 06:36 AM (2 years, 7 months ago)

Every 2 months someone comes along with a similar idea, usually they have already built it and argue with people for a while saying how it's perfect before they disappear.

At least yours used an almost proper filter...

The problems are numerous but the main one for is the airflow to be laminar must be the same size of the filter. You can't take the output and enlarge it and be laminar. There is venturi effect etc.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed

Edited by sandman420 (06/03/22 06:49 AM)

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OfflineGomedics2513
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Registered: 06/03/22
Posts: 5
Last seen: 2 years, 7 months
Re: Hepa filter build. Food for thought. [Re: sandman420]
    #27803813 - 06/03/22 07:02 AM (2 years, 7 months ago)

Do you happen to know where I can find the right kind of filter? I feel like that's probably the best place to start then match a fan up to that and find a tote with dimensions similar enough space wise to do this right. I'm determined but mostly as a fun idea. Who knows i could nail it or fail it. Will still be a fun try. I know it should have a steady push on a lighter flame. No flicker or blowing it out to be laminar correct? So I figure if I get pointed in right direction of a filter. Find a big enough inline fan since I feel they are better and less loud than birdcage, and assemble correctly. It should work the same. Please if you have any idea where I can get a 12x24 hepa filter plz lmk. Ppl say 12 inches thick is too much while others say they use it so idk. 6 or 12? Lol. Also thanks for the replies. I know how annoying it can get when ppl post the same bs. But I hope to do it right actually and back it with multiple agar tests etc. Not just build it, do some jars and say it's good cuz no contam. You can do that in open air if lucky and clean so not rally a test. Anyways thanks again brotha and again plz lmk if you know where to find the right filter either 6 or 12. And if I get a 4 or 6 inch fan, I'll get a variable one to change speeds so I can make sure it's actually true laminar flow.

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Invisiblesandman420
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Re: Hepa filter build. Food for thought. [Re: Gomedics2513]
    #27803819 - 06/03/22 07:10 AM (2 years, 7 months ago)

OK I misunderstood your original post and you are just using the tote as just the box around the filter I think.

If all you are doing is saving the wood box construction, it would work but a plastic tote is not an ideal DIY construction item.

The plastic is brittle and cracks easily and glues don't stick very well to it.

Normally you will prefer a 99.99% 5-7/8" thick filter, yours was a 99.97, acceptable in a pinch but not the prime option.

I can help you find a filter hold on.

recommended size 30x30 https://www.zoro.com/koch-filter-hepa9999-prtcl-30x30x5875-h23g3x1/i/G1504400/

24x24 https://www.zoro.com/koch-filter-hepa9999-prtcl-24x24x5875-h16g3x1/i/G1504209

24x18 I wouldnt go any smaller https://www.zoro.com/koch-filter-hepa9999-prtcl-24x18x5875-h13g3x1/i/G1504111/


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed

Edited by sandman420 (06/03/22 08:30 AM)

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OfflineGomedics2513
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Registered: 06/03/22
Posts: 5
Last seen: 2 years, 7 months
Re: Hepa filter build. Food for thought. [Re: sandman420]
    #27803828 - 06/03/22 07:26 AM (2 years, 7 months ago)

Absolutely appreciate it a ton. Thank you very much. If all else fails and this tote thing doesn't work as I expect. I'll have a buddy make me a professional wooden box with dimensions cut out for what I need and do it the right way. I figure as long as the fan is correct for the filter I should be ok. Pretty excited either way. But for now. It's still air box. Lol
Thanks again brotha.

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Invisiblesandman420
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Re: Hepa filter build. Food for thought. [Re: Gomedics2513]
    #27803871 - 06/03/22 08:30 AM (2 years, 7 months ago)

that one 24x18 i posted was 99.97 i updated with the 99.99 sorry about that


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed

Edited by sandman420 (06/03/22 08:31 AM)

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OfflineLadyboner swordfi
Garage scientist
I'm a teapot

Registered: 05/07/22
Posts: 62
Loc: The pentagon (not earth one)
Last seen: 2 years, 7 months
Re: Hepa filter build. Food for thought. [Re: Gomedics2513]
    #27804121 - 06/03/22 12:05 PM (2 years, 7 months ago)

You want a thick filter, the depth of the filter straightens the airflow making it laminarflow.

Thin hepas wont be laminar far out. You would have to stick to the center an work very close up to it.


Theres a good video I saw about it....






He draws a diagram explaining why you want a filter with depth maybe haft way through.


--------------------
My career choice is to be an inventor not to be greedy hoe but to fund other inventors.

-Nothing impressive yet to report, researching fungi/plants and biodiesel right now.
                      Feel free to recommend literature on biodiesel or making/sources of the precursors!
My hobbit hobbies include growing toefungises, weeds and making sweat saucy love to my woman.

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Invisiblesandman420
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Registered: 06/17/04
Posts: 5,387
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Re: Hepa filter build. Food for thought. [Re: Ladyboner swordfi]
    #27804153 - 06/03/22 12:24 PM (2 years, 7 months ago)

5-7/8 is the proper thickness for traditional metal septerator HEPA filters in a clean bench

But you can use thinner mini pleats too which are 3" or other thicknesses.

The real requirement is static pressure which must be at least 0.4" at 90 fpm to achieve a laminar flow.

Thicker 12" filters have less static pressure and are not what you want at all so disregard the above statement.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed

Extras: Filter Print Post Top
OfflineLadyboner swordfi
Garage scientist
I'm a teapot

Registered: 05/07/22
Posts: 62
Loc: The pentagon (not earth one)
Last seen: 2 years, 7 months
Re: Hepa filter build. Food for thought. [Re: sandman420]
    #27804180 - 06/03/22 12:40 PM (2 years, 7 months ago)

https://www.shroomery.org/forums/showflat.php/Number/25090168



This guy uses a 12inch., they aren't actually 12 theyre 11 ½ deep.


--------------------
My career choice is to be an inventor not to be greedy hoe but to fund other inventors.

-Nothing impressive yet to report, researching fungi/plants and biodiesel right now.
                      Feel free to recommend literature on biodiesel or making/sources of the precursors!
My hobbit hobbies include growing toefungises, weeds and making sweat saucy love to my woman.

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Invisiblesandman420
Saint PP
Male


Registered: 06/17/04
Posts: 5,387
Trusted Cultivator
Re: Hepa filter build. Food for thought. [Re: Ladyboner swordfi]
    #27804197 - 06/03/22 12:57 PM (2 years, 7 months ago)

yea thats not what you want to use. it has half the static pressure of a 6" (5 7-8)

If you want to learn why see my signature link "all about static pressure /pressure drop for DIY flowhoods"

But the short of it is the filter "membrane" is actually approx. 1/4" thick on both 6 and 12" and the thickness is just more surface area from an accordion fold = easier for air to flow.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed

Edited by sandman420 (06/03/22 01:08 PM)

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