Figuring air flow

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Old 09-10-16, 12:51 PM
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Figuring air flow

Hello,
I want to add an exhaust fan in my shop to exhaust lacquer fumes. I have found an explosion proof fan on ebay and I think I can make it work. It has a 12" duct included with it an I should be able to tie into an existing section of duct that leads to a vent in the wall to outside. This is all above a drop ceiling. This vent is about 2" x 8" and I need to figure how much air will pass through it without backing up into the room. Can anyone help with this? Here is a link to the fan.
12" Explosion Proof Centrifugal Fan w Ducting | eBay

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Old 09-23-16, 05:19 AM
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This could be a life safety issue so probably will not get much help here. It would be best to get an engineer involved to calculate the CFM needed to remove the fumes. Don't forget you are going to need to replace that air. How are you going to heat that make up air?
 
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Old 09-23-16, 07:07 PM
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Thanks airman,
I'm in Florida I might have to cool the make up air. No heat necessary
I appreciate the comments.
 
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Old 09-28-16, 05:48 AM
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Cooling isn't required by code so it will only be a comfort thing if you want it.
 
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Old 09-28-16, 07:50 PM
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Comfort is good but I need to exhaust the lacquer out of the shop. I think I will have to go with a regular box fan in the doorway for now.
 
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Old 09-29-16, 06:55 AM
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Last month a co-worker described how he was spraying Etsy-type projects in his basement and complained of it stinking up the house. I pointed out the open flame from his water heater, possibly furnace, sparks from motors, etc were a potential risk and gave him a surplus water heater vent blower (3") of about 200CFM for him to build a small benchtop paint booth (foamboard) and duct it outside. He reports that the flow is enough that he can see the paint mist moving to the filter in the back of the hood and no more fumes hanging in the air.

Good enough for small projects. Hopefully you're not painting a bus in your basement.
 
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Old 09-29-16, 08:32 AM
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A friend wanted to do some auto spray painting at his shop and ran into a lot of problems with insurance. The requirements were major and they clearly stated they would not cover any resulting damage if he went ahead with the painting without the improvements. There is a lot more to it than just an explosion proof fan.

Bud
 
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Old 09-29-16, 07:12 PM
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Thats a cool little booth.I have a shop area around 1200 sq'. I spray in a small but open area around 12'x12' but open to the rest of the shop. I was hoping to build something right above me into the drop ceiling to grab the fumes before they went all through the shop. I have no gas or other pilot light type open flames around anyplace.
 
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