The automatic shutters close to form a full seal ... The 14-inch wall-mounted smart exhaust fan produce an impressive 1,513 cubic feet of air per minute, so it's effective in larger structures ...

Sturdy Shutter Exhaust Fan: This Fanspex 8-inch Shutter Exhaust built with All metal Frame body, DC brushless motor, High quality ABS thick plastic blades and front panel for durable use ...