Lots of info on VC Montpelier noise, so this may be old news/question. Finally I have the insert installed. Blower makes a very loud hum when on (coupling in through the floor, no doubt). Removed the blower, bypassed the thermal switch, plugged the unit in to an outlet and turned the blower on. Still makes a pronounced "transformer hum" sort of noise ("moving air noise" not much at all, quite tolerable) VC customer "service" is useless on this "we don't measure the DB output of the fans" and insist the dealer is the only place to go. I've seen posts suggesting packing the fan assembly with fiberglass insulation. Seems not such a good idea to me, though. At this point I'm pretty much resigned to leaving the blower out. Any other ideas?