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OfflineSpinyPine44
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Flow Hood
    #8726207 - 08/04/08 07:57 PM (15 years, 7 months ago)

I want to make a flow hood for grain to grain transfers and need some help as to how powerful of a blower I will need because i suck with math, i'm making a flow hood similar to this http://www.sentryair.com/Images/218-PCR-1-l.jpg except I'm making it with bins.  I will use a large see through bin on the bottom with a square cut out for my arms to go in and air to flow out.  I am planning to put a smaller bin on top with the fan going into it and the filter between the smaller and bigger bin so i can sanitize the large bin and the clean air will flow through it and out the cut out space in the front.  I calculated the area of the small bin i'm planning on using, it is 1.33680556 cubic ft, my filter is 6.5in by 9.5in it is rated 99.97% down to .3 microns. How powerfull of a fan will i need to use? Thanks a lot

Edited by SpinyPine44 (08/04/08 09:25 PM)

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OfflineSpinyPine44
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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8726387 - 08/04/08 08:30 PM (15 years, 7 months ago)

just found this http://www.shroomtalk.com/forum/index.php?showtopic=10414 and was so surprised cuz this is EXACTLY what i had in mind!!  I just want to use a fan or blower not a air compressor I also have the same filter shown there.  Thanks

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8727836 - 08/05/08 07:45 AM (15 years, 7 months ago)

come on can someone please help me out!

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8727879 - 08/05/08 08:04 AM (15 years, 7 months ago)


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Re: Flow hood help needed!!! [Re: smokedout420]
    #8727894 - 08/05/08 08:13 AM (15 years, 7 months ago)

I would think that if you were going to use that exact setup that the filter is no bigger than say 1 foot by 1 foot so thats about 100 cfm you need there for you can try and get one of these Fans..

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Re: Flow hood help needed!!! [Re: Damion5050]
    #8727902 - 08/05/08 08:15 AM (15 years, 7 months ago)

Or even something like this Fan

your cheapest bet would be something like this you can find them at home depot for around 20-30 bucks and they go up to 400 cfm which is enough static pressure for a hepa filter that is 2 foot by 2 foot...

Edited by Damion5050 (08/05/08 08:22 AM)

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Re: Flow hood help needed!!! [Re: Damion5050]
    #8727903 - 08/05/08 08:16 AM (15 years, 7 months ago)

alright thanks alot :smile:

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Re: Flow hood help needed!!! [Re: smokedout420]
    #8727910 - 08/05/08 08:18 AM (15 years, 7 months ago)

can someone explain the main advantage of a flowhood?  vs a glovebox???

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Re: Flow hood help needed!!! [Re: instantdeath]
    #8727916 - 08/05/08 08:21 AM (15 years, 7 months ago)

Well a flow hood usually gives you more room to work..  You have a blower that blows air throw a hepa filter into the bottom chamber..  Being this air is now clean air because it was pushed through the hepa filter then you have a clean environment to work with your jars and what not also it's more forgiving if you use half way decent sterile techniques with a flow hood you will most likely not get any contams.. 100% success rate... Only because you are working in a sterile environment..

Glovebox is same idea but less room to work in as well as they are a fire hazard because there is really no air flow..  So if you decide to use a lighter in it without being careful you will ignite the alcohol fumes and start a nice fire..

Edited by Damion5050 (08/05/08 08:24 AM)

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Re: Flow hood help needed!!! [Re: Damion5050]
    #8727956 - 08/05/08 08:34 AM (15 years, 7 months ago)

glove boxes are still useful though especially if your working with mushrooms from the wild because a flow hood will blow those spores everywhere.

Damion5050 I've never seen anyone use something like this http://www.indoorgarden.com/store/product.php?productid=16465&cat=263&page=1, will these be able to provide adequate pressure?

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8728003 - 08/05/08 08:46 AM (15 years, 7 months ago)

i just have a glovebox right now.  it looks like the flowhoods are pretty pricey.  i may stick with the glovebox for now :smile:

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8728069 - 08/05/08 09:14 AM (15 years, 7 months ago)

I doubt it. Those look kind of cheesy. You need a squirrel cage type fan. The above posted chart is what you need to figure out your setup. Laminar flow hoods move air at an ideal velocity of 100 feet per minute. Fans are rated according to how much air they can push through materials (filters) of specified resistance. Filters are measured in inches of static pressure at a specific air speed.

Before you buy a filter, you can see it's dimensions, and static pressure rating. Then you can do a division problem to ascertain what the fans CFM needs to be.

I want to build a flow hood so bad. Your one lucky buck! :cheers:


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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8728081 - 08/05/08 09:18 AM (15 years, 7 months ago)

Quote:

SpinyPine44 said:
glove boxes are still useful though especially if your working with mushrooms from the wild because a flow hood will blow those spores everywhere.

Damion5050 I've never seen anyone use something like this http://www.indoorgarden.com/store/product.php?productid=16465&cat=263&page=1, will these be able to provide adequate pressure?


Go to home depot and check them out they are in the heating and air section of the store..  the 4 inch ones should have about 100 cfm's and the 6 inch should be around 200 and the 8 inch around 400-500 cfm's..  They are mainly used as booster fans in the heating and air conditioning field..  They work very very well, and I don't see why they wouldn't work for a flow hood..

Edited by Damion5050 (08/05/08 09:21 AM)

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OfflineDamion5050
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Re: Flow hood help needed!!! [Re: BrandNewbie]
    #8728091 - 08/05/08 09:20 AM (15 years, 7 months ago)

Quote:

BrandNewbie said:
I doubt it. Those look kind of cheesy. You need a squirrel cage type fan. The above posted chart is what you need to figure out your setup. Laminar flow hoods move air at an ideal velocity of 100 feet per minute. Fans are rated according to how much air they can push through materials (filters) of specified resistance. Filters are measured in inches of static pressure at a specific air speed.

Before you buy a filter, you can see it's dimensions, and static pressure rating. Then you can do a division problem to ascertain what the fans CFM needs to be.

I want to build a flow hood so bad. Your one lucky buck! :cheers:


  The math is easy..

1. Find out the area of your filter by multiplying the width and the hight in feet (for instance the smallest reasonably usable filter would be 2ft x 1ft)
2ft x 1ft = 2 ft2

2. Multiply the required air speed(the one Stamets specifies, 100 ft/min) with the area of your filter
100 ft/min x 2 ft2 = 200 ft3/min

So 200 ft3/min(= cfm = "cubic feet per minute") is the amount of air your blower must deliver at the sum of the STATIC PRESSURE of the HEPA filter + prefilter.

NOTE: 1 cfm= 1.7m3/h

So if you use the above filter with 1"(250Pa) static pressure and a furnace prefilter with a static pressure of 0.2"(50Pa) your blower must deliver 200 cfm(340m3/h) of air at a static pressure of 1.2"(300Pa).

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Re: Flow hood help needed!!! [Re: Damion5050]
    #8728098 - 08/05/08 09:24 AM (15 years, 7 months ago)

Here u can try one of these more efficient.. Also there is nothing wrong with having to much air flow at least I don't think..  If I am wrong let me know..  FAN

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Re: Flow hood help needed!!! [Re: Damion5050]
    #8728257 - 08/05/08 10:13 AM (15 years, 7 months ago)

Quote:

Damion5050 said:
Quote:

SpinyPine44 said:
glove boxes are still useful though especially if your working with mushrooms from the wild because a flow hood will blow those spores everywhere.

Damion5050 I've never seen anyone use something like this http://www.indoorgarden.com/store/product.php?productid=16465&cat=263&page=1, will these be able to provide adequate pressure?


Go to home depot and check them out they are in the heating and air section of the store..  the 4 inch ones should have about 100 cfm's and the 6 inch should be around 200 and the 8 inch around 400-500 cfm's..  They are mainly used as booster fans in the heating and air conditioning field..  They work very very well, and I don't see why they wouldn't work for a flow hood..




Wow, I never would have thought that those could push that much air!


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Re: Flow hood help needed!!! [Re: BrandNewbie]
    #8728308 - 08/05/08 10:26 AM (15 years, 7 months ago)

i know right! they look so cheap, I'm going to check them out tomorrow.

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8729596 - 08/05/08 03:37 PM (15 years, 7 months ago)

Here are some links right to Home Depot's website..  The only reason I know about these fans is because I use to work in the heating and air industry about 4 years ago and I also use to use these fans to vent a growing chamber I had at one time for weed... :wink:

80 cfm Fan

160 cfm Fan

210 cfm Fan

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8729607 - 08/05/08 03:41 PM (15 years, 7 months ago)

and say u need like 400 cfm's u can always get 2 of the 210 cfm fans there are really cheap as is and a flow hood would be awesome to have..  I think I am gona build myself one following this tek when I get some extra money..  I just went out today and bought 2 50lbs. bags of popcorn for like 25 buck total..  So I got all kinds of grain now.. :popcorn:

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Re: Flow hood help needed!!! [Re: Damion5050]
    #8731370 - 08/05/08 10:03 PM (15 years, 7 months ago)

haha nice!! well thanks a lot man I really appreciate it you have helped me out a lot 5 :mushroom2::mushroom2::mushroom2::mushroom2::mushroom2: to you my friend!

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Re: undefined [Re: SpinyPine44]
    #8731632 - 08/05/08 11:00 PM (15 years, 7 months ago)

ty I am thinking about building this flow hood but am not sure if I want to use fans or an air compressor.  fans would definantly be less noise.  Not sure yet but I will build it this weekend

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8735981 - 08/06/08 08:45 PM (15 years, 7 months ago)

Ok so I bought one of those round fans from home depot today, I bought a 250 CFM one just to be safe  and the thing sucked  it definitively wasn't near 250 CFM.  Even when i rested it right on the filter it couldn't blow air through it.  I don't really know how powerfully 250 CFM is but i don't think it was especially since I am supposed to only need a 100 CFM blower.  I'm looking at this now and am wondering if it will work...its kind of small http://cgi.ebay.com/220VAC-DOUBLE-BLOWER-150-CFM_W0QQitemZ380037840380QQihZ025QQcategoryZ53297QQrdZ1QQssPageNameZWD1VQQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247#ebayphotohosting I think I might need something bigger because it has to create air pressure in the bin that will escape through the filter maybe something like a 250 CFM squirrel cage blower.  What do you guys think?

Edited by SpinyPine44 (08/06/08 09:03 PM)

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Re: Flow hood help needed!!! [Re: SpinyPine44]
    #8736220 - 08/06/08 09:28 PM (15 years, 7 months ago)

Itll work your just gonna need a step down transformer...Honestly you could just get one from a hydro supply store and then get a fan speed control switch.


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Re: Flow hood help needed!!! [Re: Krez]
    #8736338 - 08/06/08 09:51 PM (15 years, 7 months ago)

whats a step down transformer?

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Re: undefined [Re: SpinyPine44]
    #8736480 - 08/06/08 10:22 PM (15 years, 7 months ago)

make sure u have the filter facing the right way because air only flows through the filter in a certain direction..  also u have to make sure the top tub is not closed because u need air coming into the fan so take the lid off the top tub

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Re: undefined [Re: Damion5050]
    #8736515 - 08/06/08 10:32 PM (15 years, 7 months ago)

ya i did all that and it just isn't nearly powerful enough.

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Re: undefined [Re: SpinyPine44]
    #8736787 - 08/06/08 11:13 PM (15 years, 7 months ago)

Just grab a 120v blower.


--------------------
Kids, you tried your best and you failed miserably. The lesson is, never try.  (Homer)

Look, the thing about my family is there's five of us. Marge, Bart, Girl Bart, the one who doesn't talk, and the fat guy. How I loathe him. (Drunk Homer)

All the ways you wish you could be, that's me. I look like you wanna look, I fuck like you wanna fuck, I am smart, capable, and most importantly, I am free in all the ways that you are not. (Tyler Durden)

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Re: undefined [Re: SpinyPine44]
    #8737587 - 08/07/08 04:27 AM (15 years, 7 months ago)

Quote:

SpinyPine44 said:
ya i did all that and it just isn't nearly powerful enough.


Try one of these fans go for something along these lines these are high out put squirrel cage fans..  They will do the trick but you will pay a little more just take back that fan from home depot and use the money toward this or something like this the more CFM'S the better.

Here is another link click me

Edited by Damion5050 (08/07/08 04:29 AM)

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Re: undefined [Re: Damion5050]
    #8740211 - 08/07/08 06:29 PM (15 years, 7 months ago)

ya i think I'm just going to save up and get one of the 180 CFM blowers and use one of those controller things to make it less powerful if needed. thanks again for the links

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Re: undefined [Re: SpinyPine44]
    #8740825 - 08/07/08 08:59 PM (15 years, 7 months ago)

No Prob eventually I am going to build myself a good flow hood using a nice blower but as of now I am using one of these it cost me like 45 bucks to make.. I was gona make one of the other kind..  But I don't have the money either for a good blower and or a good compressor.. 

But when I do you can bet I'll be using a blower because the cost of a top notch blower is around $110.00 and the cost of a compressor would be $180+..  So I will definantly be using a blower..  I will build it most likely some time with the next 2 months or so when I do I'll post some pictures of it so you can see how it looks..  Also if you get your done post some pictures of it so I can see how it came out..  The only problem that may accure is the plastics tubs might not be strong enough to hold those big ass blowers..

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Re: undefined [Re: Damion5050]
    #8741192 - 08/07/08 10:10 PM (15 years, 7 months ago)

ya i was checking out that tek to it's pretty sweet, and ill post pics when i'm done with mine.  Also if the bin can't hold the blower I will just prop it up with some 2by4 blocks or something.

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Re: undefined [Re: SpinyPine44]
    #8741387 - 08/07/08 10:44 PM (15 years, 7 months ago)

2x4 aint a bad idea..  I have a buddy that is a carpenter.. I was thinking about having him make a flowhood out of some 2x4's and some plywood...  he wouldn't charge me except for the cost of material the only problem is that I don't have room for that big of a flow hood..  lol

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Re: undefined [Re: Damion5050]
    #8741502 - 08/07/08 11:08 PM (15 years, 7 months ago)

ya....you could always just make one out of a smaller filter like 2' long  and 1'high or something.

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