engine, my bathroom has a normal vent fan..just vents out air form the bathroom.. doesn't bring air in.. and in the main living room section is a normal vent without a fan... I really hate to pay dealer to run wires and install...the turbo maxx is nice as it goes right over my vent, but then I still have to have dealer install the wires for it.. im not handy myself and will mess it up... the fans on the AC unit when not in AC is not too bad and they are vented right into the roof so even my bedroom has vent ontop with that fan, but problem is no Thermostat when in fan mode, only low and high. but it is nice having multiple fan vents thruout for the fan and the AC... im not sure yet what I want to do...ARGHHHHHHH
