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Tips, Techniques, and Questions -- Technical questions or tips

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  #1  
Old 2011-12-18, 6:32pm
Judy D.'s Avatar
Judy D. Judy D. is offline
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Join Date: May 01, 2011
Location: Ohio--Crossroads of the Nation!
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Question Is this the kind of in-line fan to use in exhaust system?

I'll be using a Minor torch, natural gas, and an oxygen concentrator. I am working out what I'll need for exhaust and have found these on eBay, and am wondering whether this would be an appropriate choice for an in line fan for my exhaust system:

http://www.ebay.com/itm/280779383091...9#ht_500wt_951

Appreciate any feedback, this is all new to me. Thank you!

Judy
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Old 2011-12-19, 10:28am
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loco loco is offline
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I have two ventilation fans and they are both "can fans" or "inline fans." I love them for being quieter than most other type fans.

Although I'm not sure if the 790 CFM in the listing is going to be enough for your space. You can ask in the SAFETY room.

Oh and because someone will ask WHY I have two fans: I have a powder box as well as regular ventilation. I use a lot of frit!
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Old 2011-12-19, 11:32am
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cheng076 cheng076 is offline
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Formula for figuring required CFM is;

(Area of hood opening...length X width) X Factor = CFM

Factor is 100 for enclosed or semi enclosed hood openings such as ones having side curtins or 125 for plain old overhead openings.

Example: (hood is 2' X 4' = 8 sqr ft. hung over the bench with no side curtins) TIMES 125 = 1000 CFM required.

So the fan pictured would be marginal. Side curtins would improve its efficiency. The factors are somewhat variable depending on circumstances and other conditions such as duct work length and duct air resistance. Smooth sheetmetal ducting is far better than corrigated types.

Hoods can be made smaller if positioned closer to the flame column. In the picture note the side curtins that semi enclose the hood. My hood is 32" x 50" and my fan pulls 1200 cfm on low speed and 3000 cfm on high speed. Hope this helps.
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Last edited by cheng076; 2011-12-19 at 11:38am.
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