Lambro 109R 4-In. Aluminum Exhaust Roof Vent Cap with Screen, Damper, and Collar, 109R

• Opening/closing damper prevents outside elements from entering the vent;• Compatible with part number 636AL;• Maximum exhaust outflow with minimum back pressure;• Screen prevents birds from nesting inside of vent;• Designed to prevent leaks with proper installation;• Not recommended for clothes dryer venting;