[mosesbotbol]

Moving the air out of the garage is your primary followed by the purifier after. How it would work is the exhaust is step one and then once it's off the purifier starts. Have this function work with the garage door opener. Exhaust will blast for 5-10 minutes then the air purifier (often just an ozone generator) will go for another 5-10 minutes.

Go for more an industrial exhaust than the bathroom kind. Paint the garage in something that retards smells and/or lightly washable.