Active Ventilation 4 in. D Aluminum Round Back Static Roof Vent Roof Jack in Black with 2 in. Collar and 2 in. Tail Pipe

Active Ventilation products round back roof jack is excellent for venting a duct. The design is great for terminating air from bathrooms and range hoods. Made of rust free aluminum with tail pipe with inner vertical louvers which prevent insects, wildlife, rain and snow from entering the jack. Meets code for forest fire prone areas.