Ventilation Question

[Regiampiero]

No rabbit air is only good enough if it's within 2 ft of where you smoke. I use an industrial smoke eater I picked up on craigslist that is similar to what certain shops use. It eliminates the smoke, but the odor stays.

If you want to exhaust than you'll need some sort of return or you'll crack your window seals, but depending on the size of the fan that quarter of an inch space under the door will be more than adequate, not to mention it will actually keep most the smoke away from the door you'll be exiting from.

As far as fan size. Calculate the cubic feet in your room and think about how long you want the smoke to linger. You hot 1,620 CF of air to push, so 500 CFM will deal with that in a little more than 3 minutes, but if you want to clear the air in the time fir the next puff than you'll need at least a 1000 CFM fan.

Lastly, wall or ceiling? Really don't know without seeing the conditions, but the ceeling sound less than ideal especially if you ever consider using the attic as storage space. Than again a big silver cowling on the side of the house might not be a good choice either.

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