For venting 3” or 4” bathroom exhaust fans. Includes 3” and 4” locking plastic flanges for 3” or 4” duct installation. Improved damper design for easier outbound airflow and no back draft from outside air. Black. No. 354R: Material: Plastic, Color: Black
- For shingle roof installations only
- Opening/closing damper prevents outside elements from entering vent
- Screen prevents birds from nesting inside of vent
- Can be used in either 3 in. or 4 in. installations
- Designed to prevent leaks with proper installation