It's also a bad idea to use an existing roof vent for bathroom exhaust. You'll partially block the vent with the duct pipe, reducing the flow of cooling air through your attic. Moreover ...

If you don't have a cap on your roof like the one shown in Photo 2, chances are your bath fan vents into the attic. Running a new duct up through the roof isn't a complex job, but you will have to ...

【Anti-corrosion Material】This roof vent cap is crafted from high-quality iron, featuring a black coating on its surface. This effectively isolates the vent from the external natural ...