【Ventilation fan with Check Valve and slim design 】 This 4” air duct vent has check valve. You can keep air reversible or exhausting cooking odors by your request. When the airflow stops, it can be closed by spring automatically. And if you don’t need the check valve, you can take it off easily.
【Wall exhausted fan with filter】 When installed on glass, window or wall, it can be used to prevent dust, leaves, with ABS panel filter, providing you a clean air circulation environment.
【Easy to install】--This wall-mounted vent fan can be installed on a window or wall and is easy to install. It is an advanced window exhaust fan and wall exhaust fan with powerful motor and high performance.
【High Performance】--12W low energy consumption, noise lower than 35 dB. Also designed with back damper check valve which allows it open and close automatically with the fan.
【Widely Used】--Extractor fan comes with a power cord with plug,perfect for greenhouse, attic, bathroom, kitchen, windows, basement, garage, office, living room and other places that need ventilation.