With summer coming, I want to install a exhaust fan in my attic. It appears there are two types - roof and gable. I looked into solar fans, but since I need to use a northern exposure, I was advised against this. a) Is one (roof vs. gable) more efficient (better?) than the other? b) I currently have fan shaped attic gable vents (which don't seem to lend themselves to the square shutter vents required by the gable fans without exterior alteration). Or is it necessary? c) I have abandoned vents on my roof (from old gas heaters). Can one of these be converted to the roof fan? d) Do these vents need to be capped in the winter to avoid heat loss? e) My neighbor has an attic fan which is extremely noisy. How can I tell how quiet one will be before purchase? e) Who is the best person to install an attic fan? a roofer, an electrician? or? As you can tell, I am clueless on this sort of thing.

hello ppl, thanks for reading, first post here, iv been looking all over the net now for some time, i have a 20' long duct that hangs down 14" along the wall, does n e know a good link i could work off of, thanks alot, im going to use 1" * 2"' lumber for the box, that sound about good for the job???? thanks for the help