This is Lambro's 4-In. Aluminum Roof Cap for venting bathroom exhaust fans. The damper design allows for outbound airflow and no back draft from outside air. The metal screen prevents outside elements from entering through the vent. It boasts a screen, damper, and 1.75 in. collar.

- Opening/closing damper prevents outside elements from entering the vent.
- Screen prevents birds from nesting inside of vent.
- Designed to prevent leaks with proper installation.
- Not recommended for clothes dryer venting.

- Sold as 1 Each.