ACTIVE AIR EXHAUST SYSTEMS come with exclusive installed fan flange adaptors for 4" 6" & 8 " ducting, intake safety grill & attached power cords. Squirrel cage design. Following each fan is the intake flange size & area of air exchange each fan can perform in 2 min.
60 CFM: 4" /100 cf -95 CFM: 4"/200 cf -80 CFM: 4"/800 cf -265 CFM: 4"/1200 cf -465 CFM: 4"/2200 cf -600 CFM: 6"/2900 cf -800 CFM: 8"/4000 cf
EXTRA HEAVY DUTY AXIAL FANS for exhausting compact spaces. With Cord. The 4" has an output of 105 cfm, the 6" has an output of 235 cfm, and the 10" has an output of 550 cfm. Axial fans are quiet, and move a lot of air for their size, but do not have sufficient torque to move air through very much ducting. 2 or 3' of ducting is about all they can push through without overheating. They make superb intake or out-take fans where they merely push air between walls without ducting.