4 Inch Roof Vent Cap With Backdraft Damper For Bathroom Ventilation System Galvanized Steel Exhaust Vent In Black Durable Roof Vent For Superior Airflow Corrosion Protection No Hassle Easy Install

4 Inch Black Roof Vent Cap with Backdraft Damper
✔️ Galvanized steel build offers 75 percent airflow plus mesh guard

This 4 inch roof vent cap works as an exhaust point in bathroom ventilation setups to keep air moving outward from homes and similar buildings.

✅ Galvanized steel body with powder coating fights corrosion
✅ Backdraft damper helps block reverse airflow
✅ Includes 120mm by 90mm mesh cover with 3mm gaps
✅ Pipe extension fits under flange for duct hookup
✅ Four mounting holes secure it to roof jacks or walls

💡 What is a roof vent cap used for in ventilation systems? Roof vent caps direct air out of indoor spaces while stopping unwanted backflow. - They pair with exhaust fans to push moist air from baths and laundry areas - The damper design cuts energy loss by limiting cold air entry - Mesh screens keep pests from getting inside ducts or attics - Install options let users mount them on roofs or side walls for flexible setups