Hi Mark, a few questions if you don't mind: 1)The interior view of your final install shows the plastic plate on the interior as well as something that looks like a muffler on the vent line (another vent door perhaps?) What is the plate doing for the whole install? 2) Any idea what the CFM on the bathroom fan was? I considered using this style vent cover for a bath fan but was concerned that it wouldn't be strong enough to hold the door open; as opposed to a dryer. 3) Lastly, the maker recommends putting the metal cylinder over the vent line instead of inside it. Were you able to do this with your install?