The Lambro 6-In. ABS Plastic Roof Exhaust Vent with a molded 1.5-in. removable collar is ideal for venting through the roof. This vent is used for bath fan exhaust, range exhaust, and other general venting applications that require moist air and humidity to exit the home. Warning: use only on shingled roof installations and should not be used to vent dryers. The exhaust vent allows for maximum exhaust airflow using a damper that prevents back drafts. A preinstalled, fixed screen prevents critters from entering the home through the vent when not in use. This roof exhaust vent is made from ABS plastic material for durability and to maintain longevity. Check local building codes prior to installation.