SAILFLO 6 Inch Window Shutter Exhaust Fan with Reversible Airflow, 176CFM 25W Wall-Mounted Quiet Ventilation Fan Air Intake Extractor for Bathroom Home Bedroom Attic, φ6 Inch Impeller

This fan can breathe reversely by simply using the pull string.first time the fan turns on, second time, it reversely runs, third time the fan turns off and the shutter will be closed.It will keep your home well ventilated while reducing humidity.make you breathe fresh air and leave a comfortable environment for you.Product Details: Model:SF-LFW-15DK Panel size: 250 × 250mm Opening size: 195*195mm Exhaust air volume: 300m³/h(176 CFM) Air intake: 180 m³/h Noise: 40dB Power: 25W Speed1 year Installation Precautions: 1.Installation location>> You can purchase 1 or more to meet your needs install it in the wall, glass or windows, DIY your own air circulation system.2.Space requirements>> Do not vent in one direction in a closed environment.The installation environment requires intake and exhaust to ensure air circulation and avoid air pressure difference due to too much air flow.3.About wiring>>Each exhaust fan has a 40cm standard wire, which is convenient for you to connect to the circuit.The installation position and layout are different for each customer, so there is no design plug, you can configure the plug or power switch according to your needs.4.About noise>>30-40 dB, If you install it in the bedroom, please place it stay away from your bed.5.About wind speed>> If the air volume is too large, you can equip it with a speed controller.Or you can add more fans if the air volume is not enough.6.About after '