The fan ' s sunlight responsive design automatically adjusts rotation speed for energy efficiency, operating exclusively during daylights hours without battery maintenance required This 15W solar power exhaust fan with 75mm to 110mm duct adapter delivers ventilation for greenhouses, pet houses, and workshops using renewable solar energy, featuring without emissions and quiet operations Ideal for homeowners, gardeners managing greenhouse airflows, and pet owners seeking control in kennels or chicken coops Equipped with a brushless motor for quiet (under 40dB), the fan connects to standard PVC pipes via its 75mm intakes / 110mm outlet design and includes 5.1m weatherproof cables for flexible solar panel placement Optimizes air circulations in sunlit spaces like attic window, garage workshops, bathroom vents, and agricultural structures requiring daytime ventilation without electrical wiring, Manufacturer: APGLSXY