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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: Supalemonhaze]
#23625980 - 09/08/16 02:25 PM (7 years, 4 months ago) |
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Quote:
Supalemonhaze said: With a 12" plenum, the box is going to be 18" deep. That plus the above average size of your filter and you're gonna have a monster on your hands.
I do have a question though, is your filter actually multiple filters?
18" is exactly what I had planned. Yes it will be a monster no matter what size I make the plenum! The filter alone is huge!!!
Maybe I'll consider shaving off a few inches. Any little bit would make a big difference in the final size. Do you have any concept of how to make effective baffling?
I bought a big enough motor that it has enough extra power to overcome a little extra friction but I am really unsure as to how to make effective baffling at all.
I have thought about scattering 4 or 6 thin vertical pieces of wood in the center between the incoming air pressure and the filter. I may put in two minimum no matter what just to make it more structurally sound.
I'm not sure what you mean about the filter being multiple filters. I have two filters, a Merv 16 pre-filter and the HEPA is from Fungi Perfecti.
I decided not to cheap out on the HEPA because the ones from FP are expertly chosen for just this purpose. Anything less than clean laminar flow is unacceptable when I'm spending so much money and time in the first place!
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NumeroEno
I come from the land of lizards



Registered: 07/24/14
Posts: 9,652
Loc: Gamehendge
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: PutACapInHisAss]
#23625994 - 09/08/16 02:29 PM (7 years, 4 months ago) |
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I don't have any sort of baffle in mine. I thought about it, but decided it wouldn't make a difference. The pressure builds up in the cabinet enough that the air doesn't need to be directed mechanically. Once the pressure inside the box surpasses the static pressure of the filter the air flows evenly out of the front.
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Let it grow! Let it grow! Greatly yield! What shall we say, shall we call it by a name As well to count the angels dancing on a pin Water bright as the sky from which it came And the name is on the earth that takes it in DOG FOOD AGAR MY ELECTRIC INOCULATION LOOP
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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: NumeroEno]
#23626410 - 09/08/16 04:40 PM (7 years, 4 months ago) |
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Quote:
NumeroEno said: I don't have any sort of baffle in mine. I thought about it, but decided it wouldn't make a difference. The pressure builds up in the cabinet enough that the air doesn't need to be directed mechanically. Once the pressure inside the box surpasses the static pressure of the filter the air flows evenly out of the front.
That is interesting, I've never read it described quite that way. You make it sound almost like a pressure release valve 
How deep did you make your plenum NumeroEno?
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NumeroEno
I come from the land of lizards



Registered: 07/24/14
Posts: 9,652
Loc: Gamehendge
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: PutACapInHisAss]
#23626433 - 09/08/16 04:49 PM (7 years, 4 months ago) |
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It's pretty deep. I don't remember if I did a 12 or 14" plenum, but it's one of those two.
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Let it grow! Let it grow! Greatly yield! What shall we say, shall we call it by a name As well to count the angels dancing on a pin Water bright as the sky from which it came And the name is on the earth that takes it in DOG FOOD AGAR MY ELECTRIC INOCULATION LOOP
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Supalemonhaze
Spore syringe hater.



Registered: 10/02/15
Posts: 6,725
Loc: 12" down Europe's butthole
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: NumeroEno]
#23629589 - 09/09/16 04:15 PM (7 years, 4 months ago) |
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What I meant is if your HEPA was going to be 2 filters side by side but I see you took FP's large one. Don't worry about your hood being different than commercial models, those have a different design. Most of the filters I could find locally were replacements for commercial models. Not one of them was thicker than 2.5". The 6" filters have a much higher resistance. I agree with uno, the resistance with a filter that thick does most of the work for laminar flow.
Must have cost you a pretty penny, a filter like that from FP.
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NumeroEno
I come from the land of lizards



Registered: 07/24/14
Posts: 9,652
Loc: Gamehendge
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: Supalemonhaze]
#23629894 - 09/09/16 05:34 PM (7 years, 4 months ago) |
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It was 240 something bucks. There's also a company in Canada that sells them for cheaper, but with international shipping it would have been a wash.
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Let it grow! Let it grow! Greatly yield! What shall we say, shall we call it by a name As well to count the angels dancing on a pin Water bright as the sky from which it came And the name is on the earth that takes it in DOG FOOD AGAR MY ELECTRIC INOCULATION LOOP
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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: Supalemonhaze]
#23630711 - 09/09/16 09:29 PM (7 years, 4 months ago) |
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Quote:
Supalemonhaze said: I agree with uno, the resistance with a filter that thick does most of the work for laminar flow.
Must have cost you a pretty penny, a filter like that from FP.
I hope you are right! Maybe this is the case with this filter design. During all of my research on high-end HEPA filters from other sources I found the opposite--the thicker the filter, often the less static pressure at given foot per minute compared to the thin ones.
Some 12" thick filters had extremely low static pressure at speeds way beyond that desirable for laminar flow. A few had ratings of around 1000 feet per minute at substantially less than 1" W.G.
In addition to trusting their expertise, it is also these kinds of reasons I bought one from Fungi Perfecti. Their filters are specifically spec'd to be around 100 FPM at 1" W.G. This makes it much easier to pick a blower when specifically targeting the desired air speed range of 100-150 FPM.
In fact, I communicated with them by email and they recommended substantially more than 100 FPM when not using a hood.
Actually, I could've gone with a smaller blower considering that I intend to use a hood but with the one I bought I will have the option of ditching the hood if I wish which I know you suggest. With my design the hood will be removable so I can use it either way as desired.
Yes, it cost a ton of money! Just the shipping was $149!!!
I may get a handheld anemometer just to test out the flow across the filter. In the grand scheme of the cost of my build, $25 would be a drop in the bucket to verify the design--not to mention kind of a fun gadget to have.
I suppose I could always sell it or give it as a gift too since it will be extremely lightly used
Edited by PutACapInHisAss (09/09/16 09:40 PM)
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NumeroEno
I come from the land of lizards



Registered: 07/24/14
Posts: 9,652
Loc: Gamehendge
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: PutACapInHisAss]
#23630731 - 09/09/16 09:36 PM (7 years, 4 months ago) |
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Shipping for my filter cost just shy of 50 bucks.
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Let it grow! Let it grow! Greatly yield! What shall we say, shall we call it by a name As well to count the angels dancing on a pin Water bright as the sky from which it came And the name is on the earth that takes it in DOG FOOD AGAR MY ELECTRIC INOCULATION LOOP
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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: NumeroEno]
#23630809 - 09/09/16 10:05 PM (7 years, 4 months ago) |
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Ha! I just had the obvious thought: What are the dimensions of the plenum for the build that FP does?
They do not post dimensions on their site but maybe they will tell what they recommend if I ask nicely
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mushpunx
Fungus Punk


Registered: 04/20/14
Posts: 13,394
Last seen: 11 days, 16 hours
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: PutACapInHisAss]
#23630956 - 09/09/16 11:04 PM (7 years, 4 months ago) |
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As far as I know man for a 6" deep filter a 6" plenum will work. That's the minimum Id go but AFAIK 6' plenum will work just fine
Most of us go bigger though. I went about 10".. it was just easier in by build design
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 Amateur Mycologists United AMU Q&A
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wtfcrazymofo
foil hater



Registered: 07/26/15
Posts: 1,201
Loc: Colonial alley
Last seen: 9 hours, 55 minutes
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: PutACapInHisAss]
#23721287 - 10/09/16 06:05 AM (7 years, 3 months ago) |
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Hoods rule. Did you whip it up yet?
Where did you get the filter that robbed you on shipping?
-------------------- If you want to eat->https://www.shroomery.org/forums/showflat.php/Number/8553541 Bag sealers are to bulky (my hood isn't that big) https://www.shroomery.org/forums/showflat.php/Number/28622922
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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Re: Please Tell, Laminar Flow Hood Build Mistakes, Errors...Little Details... [Re: wtfcrazymofo]
#23722949 - 10/09/16 05:25 PM (7 years, 3 months ago) |
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Quote:
wtfcrazymofo said: Hoods rule. Did you whip it up yet?
Where did you get the filter that robbed you on shipping?
Actually, I've been side-tracked training for a new job and career. It is taking me way out of my comfort zone.
But, if I can pull it, I will be able to live almost anywhere. I want to go back where the water is warm and the surf is good!
I got the filter from Fungi Perfecti. I guess it could have been a ripoff but the box it came in is huge and it was quite well packaged.
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