The Broan/Nautilus 180 cfm vertical discharge fan helps eliminate humidity from laundry rooms, tobacco smoke from rec rooms and workshops, or cooking fumes from kitchens. The fan is capable of filtering 180 cubic feet of air per minute at 6.5 sones, and the 8-1/4-inch-by-7-inch housing fits an 8-inch round duct. The fan comes complete with a built-in damper to minimize backdrafts and is designed for vertical use only. The fan is backed with a 1-year limited manufacturer"s warranty.