Reply by mision56

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Posted on Vent oil Based Poli From Dryer Vent

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51 posts in 966 days

#1 posted 02-15-2017 03:47 PM

4 inch duct only moves about 90 CFM.
It sounds like you have about 1200 cubic feet of air in your shop.
You need to think about how many air changes per hour you want to remove the odor.
You will need to factor in make up air to match the air lost.
400 CFM exhaust and make up air will change the air in your shop once every three minutes.

- gmakra

Thank you, exactly what I was looking for!

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