To figure out the appropriate CFM needed, take your cubic feet and divide that by how often you want to clear the room out and this resulting total will give you the CFM needed. An example would be 1000 cubit feet divided by 10 minutes which would equal 100 CFM.
This fan provides 3,640 CFM which is more than enough and the 18 inch fan would also work just fine to keep the booth clear of fumes.
Canarm Explosion-Proof, Single-Speed Exhaust Panel Fan, 20in., 1/3 HP, 3640 CFM, Model# P20-4

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- Durable powder-coated finish
- Heavy-duty OSHA motor mount/guard
- Totally enclosed 1/3 HP motor with overload protection
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