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Thanks all! I figured bout 160 cfm's to turn air over every 5 mins. My fan is doing about 1200cfms. So yeah new fan or more vents.

Hello, first time poster, long time reader, this is my first time, I have a 2x4x4 tent that hook up a hvac blower type fan to, have it pulling thru tent with one 6". And one 3" inlet ducts. But with fan running the tent is sucking in! Will this hurt anything??