... air flow delivery 3. Durable motor, long service life 4.6''/8''/10''/12' Exhaust fan / ventilation fan1. Power saving and ... very safe4. Easy installation, User friendly5. Available sizes: 6” , 8”,10",12"6. Material :New white virgin plastic7.High quality blade angle ... products meet your interest, please feel free to contact with us.; 6",8",10",12" smoke Plastic shutter exhaust fan