Maximize the air and sound performance of your Broan ventilation fan by using one of our wide variety of termination fittings specifically designed for Broan fans. Designed to exhaust a fan through a slanted roofRoof vent kit includes 8' of 4" flexible ducting, roof cap model 636, 3" to 4" adapter, 4" diameter connector, and two 4" diameter clampsDo not use for dryer venting