About This Inline booster fan diameter 4 inch, speed 2300 RPM, air flow 190 CFM, voltage 110/120v Inline duct fan have superior balanced blades for long service life and quiet operation,motor features a permanently lubricated bearing that operates quietly and requires no maintenance,portable and light weight Duct fan used as intake fan to bring fresh air into grow rooms,also used as exhaust fan in smaller setups with LED or lights under 400w Max operating temp of inline fan is 130℃ / 266℉,max ambient temp is 60℃ / 140℉. if any other materials/particles get into the duct fan and get the blade stuck, users are to turn off the power immediately, clean it up, turn the power back on when handled properly 4 Inch inline fan will help to boost airflow in HVAC units to remove exhausts and odors from bathrooms & workshops and ventilate basements attics etc Overview Brand : SunStream Color : Black Electric fan design : Exhaust Fan Power Source : Electric Style : Industrial Product Dimensions : 12.5"D x 9.2"W x 8.9"H Room Type : Bathroom, Kitchen Special Feature : Portable Recommended Uses For Product : Air Circulation, Drying, Exhausting Mounting Type : Window Mount