Best roof cap for kitchen range hood vent?
Hi- hope this is the right forum to post this in...
We're installing a 600 CFM range hood in a one-story ranch house in southern Maine.
The guy at the appliance store was saying something about "if you can afford it, get one of those chef-hat type spinning roof caps". He thought that the lower-profile ones might cause ice dams because they spit the hot air right onto the roof... and/or that snow on the shallow roof pitch (5:12) might cover and block the low-profile type. Is he being overly cautious?
Clearly we want our vent to work as optimally as possible and avoid roof leaks, but we're also on a budget (and DIY.)
Related question: what type of damper is best and where to install it? I have read to install it at the thermal break, i.e. at the attic insulation level. Comments on that?