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orchidfanatic
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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) |
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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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RogerRabbit
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7410168 - 09/14/07 05:04 PM (16 years, 4 months ago) |
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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
-------------------- 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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orchidfanatic
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Re: flow hood hepa filter question [Re: RogerRabbit]
#7410242 - 09/14/07 05:20 PM (16 years, 4 months ago) |
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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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Corporal Kielbasa

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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) |
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Post deleted by Corporal KielbasaReason for deletion: .
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calicyco
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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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RogerRabbit
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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
-------------------- 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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calicyco
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Re: flow hood hepa filter question [Re: RogerRabbit]
#7410401 - 09/14/07 06:06 PM (16 years, 4 months ago) |
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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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orchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
#7410555 - 09/14/07 06:48 PM (16 years, 4 months ago) |
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thanks for the reply's
Edited by orchidfanatic (09/14/07 06:49 PM)
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Corporal 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) |
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Post deleted by Corporal KielbasaReason for deletion: .
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calicyco
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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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orchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
#7413325 - 09/15/07 02:07 PM (16 years, 4 months ago) |
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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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calicyco
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7413370 - 09/15/07 02:22 PM (16 years, 4 months ago) |
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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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orchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
#7414017 - 09/15/07 05:48 PM (16 years, 4 months ago) |
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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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calicyco
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7414066 - 09/15/07 06:04 PM (16 years, 4 months ago) |
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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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Corporal 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) |
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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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orchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
#7414251 - 09/15/07 07:22 PM (16 years, 4 months ago) |
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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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em_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) |
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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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RogerRabbit
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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) |
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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
-------------------- 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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orchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
#7416037 - 09/16/07 09:25 AM (16 years, 4 months ago) |
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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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RogerRabbit
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7416052 - 09/16/07 09:34 AM (16 years, 4 months ago) |
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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
-------------------- 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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orchidfanatic
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Re: flow hood hepa filter question [Re: RogerRabbit]
#7416365 - 09/16/07 11:38 AM (16 years, 4 months ago) |
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oh I miss read it .. it said 1200 CFM @.100 and its 1092 CFM at .8 SP .. so .93 SP of my filter would be around 1072 CFM.. then I might need to slow it down by restriction or a controler.. thanks RR I thought it was 400 CFM
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RogerRabbit
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7416938 - 09/16/07 03:38 PM (16 years, 4 months ago) |
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It will probably be perfect by the time you get a prefilter installed. 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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orchidfanatic
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Re: flow hood hepa filter question [Re: RogerRabbit]
#7417707 - 09/16/07 07:56 PM (16 years, 4 months ago) |
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the million dollar question is even if I got that blower, could I use it in a garage and hope for low cotamination on my work?
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RogerRabbit
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7417987 - 09/16/07 09:20 PM (16 years, 4 months ago) |
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Sure. You're going to work right up against the filter anyway. Be sure to shut off all other fans in the garage and close all the doors. You could improve your chances by making a plastic cage to work in, but if you can get rid of drafts in the room, working right in front of the center of the flowhood will work well. 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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Jrsxt
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Re: flow hood hepa filter question [Re: RogerRabbit]
#7418164 - 09/16/07 10:08 PM (16 years, 4 months ago) |
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Where did you purchase your filter?
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orchidfanatic
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Re: flow hood hepa filter question [Re: Jrsxt]
#7418879 - 09/17/07 05:41 AM (16 years, 4 months ago) |
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I got my filter for 35 dollars on ebay .. shipping was 35 as well its heavy at 43 pounds. do a search for airguard on ebay I think he has several more left
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OrganicMyco
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7420034 - 09/17/07 02:59 PM (16 years, 4 months ago) |
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Those seem to be a decent brand.
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orchidfanatic
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Re: flow hood hepa filter question [Re: OrganicMyco]
#7420184 - 09/17/07 03:34 PM (16 years, 4 months ago) |
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yeah five left .. search airguard hepa
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em_bre_O
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7422833 - 09/18/07 09:24 AM (16 years, 4 months ago) |
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I don't like how it's 12" thick. First, much more space usage ,bulky.
'was lazy
Edited by em_bre_O (09/20/07 03:51 AM)
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orchidfanatic
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Re: flow hood hepa filter question [Re: em_bre_O]
#7422870 - 09/18/07 09:40 AM (16 years, 4 months ago) |
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he allready said what i needed .. a blower that pushes 400 CFM @ 1" static pressure
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orchidfanatic
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Re: flow hood hepa filter question [Re: calicyco]
#7422873 - 09/18/07 09:41 AM (16 years, 4 months ago) |
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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
this blower
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em_bre_O
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7424226 - 09/18/07 03:15 PM (16 years, 4 months ago) |
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I was lazy and didn't scroll down to see the specs graph at the bottom.
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orchidfanatic
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Re: flow hood hepa filter question [Re: em_bre_O]
#7424910 - 09/18/07 06:07 PM (16 years, 4 months ago) |
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no problem just wanted you to have the all the info you needed
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orchidfanatic
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7546946 - 10/22/07 01:40 PM (16 years, 3 months ago) |
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I found this blower on ebay no bids on it .. its a high pressure blower with 525 CFM @ 1" static pressure.. does anyone know if this will work as well as the other blower I was thinking of getting ?
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orchidfanatic
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7546975 - 10/22/07 01:46 PM (16 years, 3 months ago) |
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reading back on this post I see that it will work, price is right too I think I will bid on it so I can get my flow hood built.
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em_bre_O
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7587211 - 11/02/07 10:31 AM (16 years, 2 months ago) |
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I got a 1200cfm off ebay and figured it would end up about right when it got down to .8sp but it seems alil' strong. same filter btw
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orchidfanatic
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Re: flow hood hepa filter question [Re: em_bre_O]
#7587276 - 11/02/07 10:52 AM (16 years, 2 months ago) |
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you got the 2x2x11" airguard filter? SP is .93 on that baby
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orchidfanatic
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7587280 - 11/02/07 10:53 AM (16 years, 2 months ago) |
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do you have a prefilter on it ? that would bring it down some
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orchidfanatic
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7662101 - 11/21/07 09:48 AM (16 years, 2 months ago) |
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finally finished so how does this airflow look to those that have a flow hood? the prefilter
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RogerRabbit
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Re: flow hood hepa filter question [Re: orchidfanatic]
#7662157 - 11/21/07 10:04 AM (16 years, 2 months ago) |
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Looks fine. You could probably also slow it down a bit. Be sure to set it on a solid table or piece of glass for sterile work. The airflow would carburete dirty air up through the slits in your workbench. I'm sure you know that-just pointing it out for others who might have a similar table/bench.
Don't forget to run it for at least an hour before beginning sterile work. I also spray the face of my flowhood with lysol before starting it up to nuke the contaminants that have settled on the filter while it was off. 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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orchidfanatic
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Re: flow hood hepa filter question [Re: RogerRabbit]
#7662179 - 11/21/07 10:11 AM (16 years, 2 months ago) |
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Thanks for the tips RR .. I guess I could restrict the prefilter somewhat to slow the flow down a little.
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