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JvF
Fletcher Detcher


Registered: 02/13/14
Posts: 2,662
Loc: Chicago
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Flow hood blower question
#21758148 - 06/03/15 05:00 PM (8 years, 7 months ago) |
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Found this blower on craigslist, the guy said its 1800 cfm. Does that seem likely? Also whatre anyones general thoughts on it?
http://chicago.craigslist.org/wcl/for/5044929188.html
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maddchef
Vaginal escape artist



Registered: 09/04/09
Posts: 5,602
Loc: Your mom's vag
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Re: Flow hood blower question [Re: JvF]
#21758161 - 06/03/15 05:02 PM (8 years, 7 months ago) |
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It could be 1600cfm but without more specs don't buy it.
It may drop to 50cfm @ 1sp
-------------------- In the land of the blind, the one eyed man is king. All mushrooms are edible, but some only once..... Easier than cakes I do science and shit.
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JvF
Fletcher Detcher


Registered: 02/13/14
Posts: 2,662
Loc: Chicago
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Re: Flow hood blower question [Re: maddchef]
#21758182 - 06/03/15 05:07 PM (8 years, 7 months ago) |
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So what specs should i be asking about? Also, what do you mean drop at 1sp?
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maddchef
Vaginal escape artist



Registered: 09/04/09
Posts: 5,602
Loc: Your mom's vag
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Re: Flow hood blower question [Re: JvF]
#21758211 - 06/03/15 05:13 PM (8 years, 7 months ago) |
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Filters have resistance. Some fans have more ummpphh than others.
If your fan doesn't have enough muscle it won't be able to provide laminar flow when paired with your filter.
-------------------- In the land of the blind, the one eyed man is king. All mushrooms are edible, but some only once..... Easier than cakes I do science and shit.
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Subnet Mask



Registered: 05/08/15
Posts: 903
Loc:
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Re: Flow hood blower question [Re: maddchef]
#21758222 - 06/03/15 05:16 PM (8 years, 7 months ago) |
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Your signature grosses me out. Every time.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Flow hood blower question [Re: JvF]
#21758223 - 06/03/15 05:16 PM (8 years, 7 months ago) |
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if you don't know about how to build a flow hood why are you building a flow hood. you don't need one until you understand one.
you need to get the graph of the blower against static pressure
you could have two 1200CFM blowers and if you put a 1SP HEPA filter up to both of them. one of them may end up pushing 200CFM and the other 50CFM.
amps volts ohms but with air.
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Sockadin



Registered: 01/03/10
Posts: 7,244
Last seen: 2 months, 21 days
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Re: Flow hood blower question [Re: bodhisatta]
#21758393 - 06/03/15 05:51 PM (8 years, 7 months ago) |
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It's like Ohms law but with air flow. AmpxResistance=Volts or some shit.
The point is that you static pressure is the amount of air build up in the space between the output of the blower and the resistance of the filter. If you Hepafilter is rated it will have a graph showing how much volume vs the pressure of 1sp to produce even laminar air flow over the surface of the filter. I think I typed that correctly. Im not the smartest guy In the thread, I just have the experience of purchasing two blowers because I did the math wrong the first time. Don't be me, do the math!
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JvF
Fletcher Detcher


Registered: 02/13/14
Posts: 2,662
Loc: Chicago
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Re: Flow hood blower question [Re: Sockadin]
#21758456 - 06/03/15 06:03 PM (8 years, 7 months ago) |
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Thanks for the help everyone, cleared some things up. Obviously i have some more reading to do.
@subnet- in a good way?
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PirateSwazey


Registered: 12/12/12
Posts: 2,993
Loc: Here, Now
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Re: Flow hood blower question [Re: JvF]
#21759287 - 06/03/15 09:21 PM (8 years, 7 months ago) |
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U can use that fan but will probably need atleast 2'x2' of filter to be able to swing it.
It's very easy to choke a fan or add a cheap speed controller to regulate it down.
I have a flowhood thread somewhere where I show how to do this if you want to see it
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