Building an Airbrushing Booth.

[e-paw]

Go with a separate duct. Think about the amount of lint and dust trapped inside a dryer vent that could be blown out on to a freshly painted whatever, or paint getting sent into your dryer full of cloths. There are one way traps available for exhaust duct, but they rarely work .I change out the motors on exhaust fans and find all kinds of stuff that gets past the one way doors. On a side note you should change or clean out the vent on your dryer once a year to help guard against a lint fire.