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Invisibleorchidfanatic
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flow hood hepa filter question **** update finished with picture*****
    #7408886 - 09/14/07 12:17 PM (16 years, 4 months ago)

I am building a flow hood the filter I acquired is a 2x2x11.5" filter
I am looking at this 814 CFM blower from grainger to use with it
will it suit my needs. the price is right .. will I need to slow it down ? with a controller?.. thanks for any helphttp://www.grainger.com/Grainger/items/2C946

filter specs: 2'x2'x11.5" resistance is .93 (static pressure?)
efficiency is .013 max CFM 1000..

whole house blowers are cheaper but would be loud and dangerous
thanks for any help



here is the flow from the finished flowhood how does it look?
thanks for your opinion


Edited by orchidfanatic (11/21/07 09:50 AM)


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OfflineRogerRabbitM
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Re: flow hood hepa filter question [Re: orchidfanatic]
    #7410168 - 09/14/07 05:04 PM (16 years, 4 months ago)

Quote:

From Graingers.com: CFM @ 0.700-In. SP - 280 CFM




Your filter has 4 square feet. You want a blower that will deliver 400 cfm or better @ 1" static pressure in order to get the 100 feet per minute flow rate on the sterile side of your filter. That one drops to 280 cfm at .7" static pressure, so it's not going to cut it.
RR


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Invisibleorchidfanatic
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Re: flow hood hepa filter question [Re: RogerRabbit]
    #7410242 - 09/14/07 05:20 PM (16 years, 4 months ago)

yes thank you for pointing that out to me .. I need a much larger CFM blower for this filter. might have to look into axial fans to get me this CFM flow at .93 Static press.
thank you RR


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Re: flow hood hepa filter question *DELETED* [Re: RogerRabbit]
    #7410341 - 09/14/07 05:49 PM (16 years, 4 months ago)

Post deleted by Corporal Kielbasa

Reason for deletion: .



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Invisiblecalicyco
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Re: flow hood hepa filter question [Re: Corporal Kielbasa]
    #7410367 - 09/14/07 05:56 PM (16 years, 4 months ago)

Check out this thread: http://www.shroomery.org/forums/showflat.php?Cat=0&Board=75&Number=1518026&fpart=&PHPSESSID=

I posted a lot of links to blowers when I built a flow hood.

You'll need a pretty gnarly blower, the one I used would knock you down standing in front of it :-) Yet you barely feel any air moving coming through the filter. A good blower is going to set you back about $300.

Find the specs on Grainger for what you need, then look here: http://www.electricmotorwarehouse.com/dayton_blower.htm


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OfflineRogerRabbitM
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Re: flow hood hepa filter question [Re: Corporal Kielbasa]
    #7410373 - 09/14/07 05:56 PM (16 years, 4 months ago)

Correct, except that you have to figure about ten percent losses from friction, the prefilter, etc. Therefore, you'd want a bit more than 800 cfm. I'd look for 1000 cfm @ 1" static pressure.
RR


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Invisiblecalicyco
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Re: flow hood hepa filter question [Re: RogerRabbit]
    #7410401 - 09/14/07 06:06 PM (16 years, 4 months ago)

The Dayton 4C831 blower is 1/2 HP and puts out 1092 CFM at .8"

http://www.grainger.com/Grainger/items/4C831


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Invisibleorchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
    #7410555 - 09/14/07 06:48 PM (16 years, 4 months ago)

thanks for the reply's


Edited by orchidfanatic (09/14/07 06:49 PM)


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InvisibleCorporal Kielbasa

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Re: flow hood hepa filter question *DELETED* [Re: calicyco]
    #7412571 - 09/15/07 09:41 AM (16 years, 4 months ago)

Post deleted by Corporal Kielbasa

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Invisiblecalicyco
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Re: flow hood hepa filter question [Re: Corporal Kielbasa]
    #7413147 - 09/15/07 01:09 PM (16 years, 4 months ago)

Yeah, graingers is best for pricing but it can be difficult to purchase from them unless you are a business. At least that was my experience a few years ago. Once you find the right blower do a bit of googling, you might find one at a surplus place for very cheap.


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Re: flow hood hepa filter question [Re: calicyco]
    #7413325 - 09/15/07 02:07 PM (16 years, 4 months ago)

thats a major blower I need myabe I should have gotten a 12x24 filter
anyone want to trade this 2x2 for a 12x24?


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Invisiblecalicyco
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Re: flow hood hepa filter question [Re: orchidfanatic]
    #7413370 - 09/15/07 02:22 PM (16 years, 4 months ago)

12x24 might be a bit small, especially when dealing with quart jars. You want plenty of sterile space around your work area. I built one years ago and bought a 24x36 hepa, man oh man its friggin huge hehe. But it worked like a charm, absolutely the best thing ever.


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Re: flow hood hepa filter question [Re: calicyco]
    #7414017 - 09/15/07 05:48 PM (16 years, 4 months ago)

yeah I thought a 12x24 was going to be small thats why I jumped at this one .. but It looks like I need a tornado to use it .. meaning it wont be very portable and as such will need to be setup in the garage.. not the best place for a flow hood.. considering an axial whole house fan .. way cheaper than a shaded pole fan ..cept I dont see any specs on those types of fans.. more researching needed ..


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Invisiblecalicyco
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Re: flow hood hepa filter question [Re: orchidfanatic]
    #7414066 - 09/15/07 06:04 PM (16 years, 4 months ago)

Not portable is an understatement hehe. When I decommissioned mine I had to tear the entire box apart it wouldn't fit through the door. It weighed like 150lbs.

An axial whole house fan would be more expensive I think. I looked around a bit and found one that is 930CFM at .5" and it was $400, and thats not even strong enough.

AC and heating shops replace blowers all the time, you may be able to score one for free if you call around and are really nice. They just sell them as scrap.


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InvisibleCorporal Kielbasa

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Re: flow hood hepa filter question [Re: RogerRabbit]
    #7414222 - 09/15/07 07:09 PM (16 years, 4 months ago)

so for an 8 foot area of filter do you think this fan would work
Blower,10 5/8 In,115 V
Furnace Blower, Wheel Diameter Over Blades 10 5/8 Inches, Voltage Rating 115 Volts, Current Rating 11.2 Amps, Wheel Diameter Over Rim 11 1/8 Inches, Wheel Width 10 5/8 Inches, Speed 1050 , Type PSC, Number of Speeds 4, Motor Power Rating 3/4 , Capacitor Size 15 uF, Air Flow @ 0.400 Inch Static Pressure 2374/2093/1819/1547 CFM, Air Flow @ 0.500 Inch Static Pressure 2218/1991/1740/1467 CFM, Outlet Height 11 3/8 Inches


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Invisibleorchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
    #7414251 - 09/15/07 07:22 PM (16 years, 4 months ago)

Quote:

calicyco said:
Not portable is an understatement hehe. When I decommissioned mine I had to tear the entire box apart it wouldn't fit through the door. It weighed like 150lbs.

An axial whole house fan would be more expensive I think. I looked around a bit and found one that is 930CFM at .5" and it was $400, and thats not even strong enough.

AC and heating shops replace blowers all the time, you may be able to score one for free if you call around and are really nice. They just sell them as scrap.




thats a good idea on the AC service guys . thanks


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Invisibleem_bre_O
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Re: flow hood hepa filter question [Re: calicyco]
    #7414438 - 09/15/07 08:19 PM (16 years, 4 months ago)

Quote:

calicyco said:
12x24 might be a bit small, especially when dealing with quart jars. You want plenty of sterile space around your work area. I built one years ago and bought a 24x36 hepa, man oh man its friggin huge hehe. But it worked like a charm, absolutely the best thing ever.





12"x24" is not to small.


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Re: flow hood hepa filter question [Re: em_bre_O]
    #7415742 - 09/16/07 07:39 AM (16 years, 4 months ago)

Agreed. I use a 12 X 24 that I bought years ago from fungi.com and still use it daily. It's fine for petri dishes through quart jars, but when using large spawn bags, they have to be laid on their sides to keep them within the sterile airflow. It works OK, but a 24 X 24 would definitely be better.

In addition, since it's always a good idea to close off your 'lab' for an hour before doing sterile work while your flow hood runs, the larger flow hood would scrub the air clean much sooner.
RR


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Invisibleorchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
    #7416037 - 09/16/07 09:25 AM (16 years, 4 months ago)

Quote:

calicyco said:
The Dayton 4C831 blower is 1/2 HP and puts out 1092 CFM at .8"

http://www.grainger.com/Grainger/items/4C831




that link shows the blower at 1200 CFM at .100 static pressure
thats way to high the filters max CFM is 1000 .. dont I need one that
gives me 400 CFM @ .100 static pressure? 2x2 4 square feet right?


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OfflineRogerRabbitM
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Re: flow hood hepa filter question [Re: orchidfanatic]
    #7416052 - 09/16/07 09:34 AM (16 years, 4 months ago)

Quote:

dont I need one that
gives me 400 CFM @ .100 static pressure?




No, you need one that gives 400 CFM @ 1.00" static pressure.
RR


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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."
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