304 Stainless Steel Non-Powered Hood, Factory Ceiling Exhaust Fan Ball Puller, Cooling (Small: 12)

Practical: Very effective in preventing downdrafts and increasing ventilation. The chimney lid ring prevents wind from going down the chimney, completing the solution to prevent downdrafts. ✔ QUIET & RAINPROOF - Curved fan blades have encrypted blades to ensure rainwater does not invade during working conditions. High exhaust efficiency allows easy operation. Protect your fireplace from rain and moisture ✔Working principle: use natural wind and thermal air convection caused by indoor and outdoor temperature differences to make the turbine rotate and discharge indoor air. 110-250mm comes with its own clamp, 300mm comes with its own foot pads Quiet & Rainproof - The roof vent turbine makes no noise when turning. Encrypted blade spaces are small enough to prevent rainwater from entering the ventilation system.