This SS, 27" ventilation unit, Twister Model AK8000AS is for insert into a hood fan housing. It was newly purchased before we ultimately changed our renovation plans. It is now a discontinued item and ours is in the original unopened box. Exhaust internal blower of 290CFM, 3.2 Sones, 3 speed levels.Lighting is 2 35watt Halogen bulbs. It has a washable mesh filter. Duck size 6" diameter. $110. Check out the prices of other ventilation units for sale, and you will see what a bargain this is. Find more the info on website: Zephyr Ak8000bs 28-inch Twister Built-In Hood Insert. Checkout the positive reviews on this item.