Roof shapes and interior features vary ... But recessed light fixtures or plumbing exhaust pipes aren’t always air-sealed where they penetrate the ceiling. Inadequate or compressed attic ...

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 ...

The built-in extension can be seamlessly connected to flexible or metal ducts and is compatible with kitchen and roof exhaust systems for efficient indoor air circulation. 【Widespread ...