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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
Last seen: 8 years, 8 months
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Flowhood Construction Advice
#17187886 - 11/08/12 11:34 PM (11 years, 6 months ago) |
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So I am pretty pumped up, I finally got all the parts together to built my flow hood, I am going to be following Stonesun's tek, however there will be some deviations. I have a 24X24 HEPA filter, and my dayton blower is off a vent hood that goes above a range in a large kitchen.
It will move 460 CFM, will this air flow be sufficient for this filter?
Also since this is a blower off of a vent hood and the motor is obviously AC I cannot switch the direction of the motor and subsequently the airflow, I say this because where a blower normally would input air, this one will output air flow. So I am going to have to rig this blower so that it still effectively pushes air through the filter and gets pre-filtered, that should not be too big of a problem though.
Here is a link to the tek, and some pictures of what I am working with.
Flowhood Build TEK
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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TheCyndicate
Conglomerate



Registered: 10/16/11
Posts: 1,195
Loc: Outer Haven
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Re: Flowhood Construction Advice [Re: Kramer]
#17189154 - 11/09/12 08:16 AM (11 years, 6 months ago) |
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You will need a different blower ... sorry .... 460 cfm is much to low for laminar flow for the filter you have...I have the same filter. Do the math. And it will tell you the right blower to match with your filter
Cyn
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
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Re: Flowhood Construction Advice [Re: TheCyndicate]
#17189373 - 11/09/12 09:15 AM (11 years, 6 months ago) |
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NO! Really? Are you sure? I got this one for 15 dollars and it has only been used for like an hour.
Oh man I am bummed out now.
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
Last seen: 8 years, 8 months
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Re: Flowhood Construction Advice [Re: Kramer]
#17194454 - 11/10/12 07:57 AM (11 years, 6 months ago) |
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I just checked through a few posts RR said in another post 400-500 CFM would do for a HEPA this size, I will just keep my pre-filter on the less restrictive side. I am going to make a lengthy post the day I do the build and show how it goes. Hopefully all goes well.
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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RogerRabbit
Bans for Pleasure



Registered: 03/26/03
Posts: 42,214
Loc: Seattle
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Re: Flowhood Construction Advice [Re: Kramer]
#17194746 - 11/10/12 09:24 AM (11 years, 6 months ago) |
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Quote:
I have a 24X24 HEPA filter, and my dayton blower is off a vent hood that goes above a range in a large kitchen.
It will move 460 CFM, will this air flow be sufficient for this filter?
Vent hoods in a kitchen blow directly outside with no filter(static pressure) to push through. That isn't going to work. . .period. You want 450cfm to 500cfm @ .8" to 1" W.G. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
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Re: Flowhood Construction Advice [Re: RogerRabbit]
#17199374 - 11/11/12 05:16 AM (11 years, 6 months ago) |
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I don't mean to be argumentative but are you sure, I wired it yesterday and was checking everything and the damn thing blows air with quite a bit of force. I fired it up from a 3 prong power cord from a broken appliance.
Also if this ends of not doing the job, I was looking at some of these inline blowers. I believe this will work, this particular one is 700 CFM I would wired in a power controller as well in order to get the proper pressure, and laminar flow.
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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RogerRabbit
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Registered: 03/26/03
Posts: 42,214
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Re: Flowhood Construction Advice [Re: Kramer]
#17199450 - 11/11/12 05:36 AM (11 years, 6 months ago) |
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CFM rating is irrelevant unless it's accompanied by a chart showing static pressure.
Squirrel cage blowers are best for flowhoods. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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maxamillian1989
Stranger


Registered: 10/04/12
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Re: Flowhood Construction Advice [Re: RogerRabbit]
#17201081 - 11/11/12 01:29 PM (11 years, 6 months ago) |
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Ok, so I'm having the same issues with figuring out the static pressure in my inline fans, and if it will work with my design.
I have an8" 750cfm inline fan, and would like to piece that with a 36X24X5.8" Micron Filter, what I'm concerned about, is if it will create the proper amount of static pressure needed, with my design, the fan will be inside the box the HEPA filter is on.
OR if you would recommend a filter to buy, for my fan, and how to build.
Edited by maxamillian1989 (11/11/12 02:13 PM)
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
Last seen: 8 years, 8 months
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OK so I made a solid game plan, and I am really having trouble figuring out my blower size needed, and where the hell to find it. I can't seem to find static pressure charts on any of these blowers that I see on the internet.
Also is there a suggested size for my plenum? My HEPA filter is 24x24 and 12 inches deep. I figured I would make my side panels 32 inches making the plenum 24x24x20 inches.
RR if you read this your first bit of advice helped a lot, and I need some advice on how to go forward from here so I don't buy a fart fan.
Below is my filter stats sticker:
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
Last seen: 8 years, 8 months
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Re: Flowhood Construction Advice [Re: Kramer]
#17226337 - 11/15/12 08:44 PM (11 years, 6 months ago) |
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Would any of these work?
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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bakenast
Muffen Stuffer


Registered: 03/14/11
Posts: 920
Last seen: 1 year, 4 months
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Re: Flowhood Construction Advice [Re: Kramer]
#17228856 - 11/16/12 09:37 AM (11 years, 6 months ago) |
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i use a 8" valueline inline fan for my 24x24 works perfect and i was worried it would be underpowered but i still needed to add a prefilter to slow airflow,, im confident ur 8" fan will work, but ur filter was tested at 1000cfm for its performance rating,,, and the 6' valueline on a 12x24 hood works perfect as well..
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
Last seen: 8 years, 8 months
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Re: Flowhood Construction Advice [Re: bakenast]
#17229671 - 11/16/12 01:21 PM (11 years, 6 months ago) |
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I got all my answers!
bakenast you are correct, and I ordered a 8 inch inline fan and it will blow 1" of static pressure at 543 CFM, so my 24x24 filter is going to work perfect with this and I should be just where I want with a good pre-filter. If needed after I build the entire thing, I will get a power controller to fine tune my laminar flow where I want it to be.
I am so pumped to finally get this thing built and have a good sterile work area, agar work, and grain to grain will be so much easier, my still air box was getting annoying as hell.
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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bakenast
Muffen Stuffer


Registered: 03/14/11
Posts: 920
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Re: Flowhood Construction Advice [Re: Kramer]
#17230489 - 11/16/12 04:35 PM (11 years, 6 months ago) |
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ya it makes things alot easier,, instead of buying a speed controller u can just block part of your intake..
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eLeSDenes
Mycelium Expander




Registered: 05/25/11
Posts: 955
Last seen: 1 month, 4 days
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Re: Flowhood Construction Advice [Re: bakenast]
#17397495 - 12/15/12 03:57 PM (11 years, 5 months ago) |
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Hey dude! I don't know how is your flowhood project going , but if you still need a fan just buy an inline fan. I have that in my flowhood and works well
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Kramer
Laughs for Pleasure




Registered: 07/25/12
Posts: 277
Loc: New York
Last seen: 8 years, 8 months
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Re: Flowhood Construction Advice [Re: eLeSDenes]
#17397552 - 12/15/12 04:13 PM (11 years, 5 months ago) |
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already built it and used it, i am going to put pictures up after I stain it, thanks though
-------------------- Trade List<--Trade List If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ~John Louis von Neumann
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Willy Wonka
Medicine Man



Registered: 12/14/11
Posts: 2,109
Loc: The Other Side
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Re: Flowhood Construction Advice [Re: Kramer]
#17401607 - 12/16/12 01:17 PM (11 years, 5 months ago) |
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I am glad I found this post. I have the same filter and I have been wracking my brain for quite awhile trying to find the info I need. I have even contacted American AirFilters (AAF) to get information about my filters static pressure/working point and I have had no luck.
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