COOL AND CLEAN: This is an excellent solution for Small Chicken Coops, Doghouse,Greenhouses, Sheds,Pet houses,attic, etc. Window Exhaust in the hot summer .The 15W Solar Panel Dual Fan Kit can push the heat air out and push the cool air in,which effectively reduces the indoor temperature and keeps the air fresh. LARGE AIRFLOW: It is designed with high quality weatherproof motor, service life more than 6 years, with Max rotational speed 3200 r/min, 200 CFM large airflow.Recommended Max greenhouse &chicken coops space:200cubic feet(L X W X H) WEATHERPROOF DESIGN: The motor part of fan (PCB board/wiring/bearing) has been coated to prevent rain from causing short circuit or damage .The waterproof level can reach IPX7, which is suitable for outdoor environment use. RUSTPROOF AND SAFETY DESIGN: The dual fan is equipped with a double protection net to prevent small animals from being injured and to protect the normal operation of the fan blades.Sturdy and durable, the fans equipped with hard plastic frame, completely waterproof and rustproof, safe enough. NOTE: The speed of the fan is greatly affected by sunlight. When the sun shines directly on the solar panel, the fan can reach 3200 RPM