broan 24 built in power pack insert bbn2243ssKeep your smoke alarm silent with this power pack insert from Broan. With 350 cubic feet per minute (CFM) of venting power and three fan speeds to choose from, smoke and odours are easily cleared away. Plus, Heat Sentry automatically sets the speed to high when excessive heat is detected to take the guesswork out of your cooking experience. This insert fits into the underside of your cabinet for a flush appearance, while the smooth stainless steel