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OfflineSchwip
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Registered: 06/27/05
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Smalles ratio or just smallest possible flowhood
    #5688638 - 05/29/06 09:43 PM (17 years, 8 months ago)

Well, last time i had a nice flowhood it was freaking huge.

Now, I no longer have a bunch of space to dedicate to the hobby.

So my question:

What would be the smallest possible flowhood i could make that would still be effective?

Im thinking something pretty flat. A prefilter and filter only inches apart. Maybe a total of 10" to 12" depth.

Any input?


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--------------------------------

" If the sky were to suddenly open up there would be no law. There would be no rule. There would only be you and your memories... the choices you've made, and the people you've touched. If this world were to end there would only be you and him and no-one else. "

..............

"MAN! You know there aint no such thing as left over crack!"



Edited by Schwip (05/29/06 09:45 PM)


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OfflineSchwip
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Re: Smalles ratio or just smallest possible flowhood [Re: Schwip]
    #5690087 - 05/30/06 09:48 AM (17 years, 7 months ago)

bump


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--------------------------------

" If the sky were to suddenly open up there would be no law. There would be no rule. There would only be you and your memories... the choices you've made, and the people you've touched. If this world were to end there would only be you and him and no-one else. "

..............

"MAN! You know there aint no such thing as left over crack!"



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Offlineno_satori
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Re: Smalles ratio or just smallest possible flowhood [Re: Schwip]
    #5690137 - 05/30/06 10:15 AM (17 years, 7 months ago)



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~NS

Grow Log #1 (P.E.) -


Edited by no_satori (05/30/06 10:17 AM)


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OfflineAnnoA
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Re: Smalles ratio or just smallest possible flowhood [Re: Schwip]
    #5690145 - 05/30/06 10:20 AM (17 years, 7 months ago)



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OfflineSchwip
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Re: Smalles ratio or just smallest possible flowhood [Re: Anno]
    #5690170 - 05/30/06 10:37 AM (17 years, 7 months ago)

Yes!

That auction link is pretty well what I had in mind. :smile: 

Well got some ideas now.......I'll post again when i have a solid plan.

Is there a set formula or standard for fan cfm to output size?


--------------------
--------------------------------

" If the sky were to suddenly open up there would be no law. There would be no rule. There would only be you and your memories... the choices you've made, and the people you've touched. If this world were to end there would only be you and him and no-one else. "

..............

"MAN! You know there aint no such thing as left over crack!"



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OfflineSchwip
Never sleeps.
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Registered: 06/27/05
Posts: 3,937
Last seen: 11 years, 2 months
Re: Smalles ratio or just smallest possible flowhood [Re: Schwip]
    #5690207 - 05/30/06 10:52 AM (17 years, 7 months ago)

Ok found the formula i was looking for.

In case anyone else is interested:

Quote:

According to Stamets (Paul Stamets and J.S.Chilton: The Mushroom Cultivator p. 347 ff) the air speed of the air flowing from the filter surface should be (at least) 100 feet per minute(fpm).(around 30 meter per minute or 0.5 meter per second). Determining the correct blower for a filter consists of several steps:

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).




--------------------
--------------------------------

" If the sky were to suddenly open up there would be no law. There would be no rule. There would only be you and your memories... the choices you've made, and the people you've touched. If this world were to end there would only be you and him and no-one else. "

..............

"MAN! You know there aint no such thing as left over crack!"



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InvisiblePrisoner#1
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Re: Smalles ratio or just smallest possible flowhood [Re: Schwip]
    #5690210 - 05/30/06 10:54 AM (17 years, 7 months ago)

I have that same unit, ask the seller about the voltage as mine is 240v and others are 120v, I had to do some wiring to make mine work


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