On a sunny day, indoor temperature can rise like an oven. The CDT solar fan is designed to reduce indoor temperatures by as much as 40 F with maximum efficiency and whisper quiet operation.The environmentally friendly CDT solar fan can provide optimal ventilation to improve air quality, minimize moisture and reduce energy costs.CDT solar fan can ventilate up to 300 square feet of space, removing up to 200 cubic feet of hot, humid, stale air per minute.Use it wherever ventilation is needed: Attic Cabin Greenhouse Shed Trailer Basement RV Truck Portable Toilet Boat Garage Crawlspace Van Bathroom Cargo Container10 feet of wiring is included.For more information: visit CDTsolar website.