831F Low Noise Ventilation Fan Reversible Exhaust Fan With Remote Control Attic Pipe Ventilation Extractor Two Way Duct Fan

The 4inch exhaust fan is make from ABS, It can bear to everyday wear and tear, guaranteeing long terms performances. This bathroom fan offers intake and exhaust to indoor and outdoor temperatures, effectively purifying indoor air. Included remote control simplifies the operation of round exhaust fan from a distance. The check valves automatically opens during operation and closes when stopped. Low noise, easy to use. It can conveniently installed in locations such as garages, workshops, chicken coops, sheds, attics, greenhouses, offices, hospitals, and theaters, suitable for both indoor and outdoor, residential and commercial use.