Just installed a fantastic fan in the bedroom and two fantastic smoke colored vent covers. Not to terribly hard to do...hardest thing is getting up on the roof. Possibly a bit more involved...you remove 4 of he screws securing the fan....removing some dicot and re sealing the vent in those four areas. You use some longer screws and a clip to allow the cover to be removed easily with the pull of a few cotter pins. Once fully assembled they seem pretty stiff and allow for good airflow. I would like a screen on the vent however.