The vent moves a considerable amount of air as one would expect, some key points
- there are easier ways to install than listed in the instructions. No template included, so the instructions state to hold it up and mark the mounting hole locations, which would be very difficult. On items such as this, I mark the hole locations on my level and then use the level to mark the hole locations. 
- low speed is noisier than the higher speeds due to the squirrel cage being just a bit out of round and a little out of balance, it makes the unit sound cheap. 
- unit includes damper, a plus.
- other than that, the unit was not difficult to install, looks good and functions well.