Eric, ours is in that vent in the bathroom. We decided on that location since the controls are on the fan and we'd have to use a stool to reach it in the kitchen vent. Plus it's very accessible for exhausting moisture when showering.
This is the vent cover we are using:
http://www.campingworld.com/browse/s...13655&src=SRQC
I bought it and the fantastic fan at the RV Surplus store in Elkhart, IN, during the rally last September. I think they're the one someone posted the url to --
www.rvsurplussalvage.com
I haven't recently compared their prices to CW on this item.