A 4'' mid grade inline should run about 170 CFMs. 3x3x6= 54cuft/170= aprox 3x a minute running NONSTOP. This should be MINIMUM exchange rate, so IMO you should NOT stop your fan at all!
A 4'' mid grade inline should run about 170 CFMs. 3x3x6= 54cuft/170= aprox 3x a minute running NONSTOP. This should be MINIMUM exchange rate, so IMO you should NOT stop your fan at all!