Air collector OS22 Solar air heater, air ventilator with LCD thermostat: heating air Conditioner Conditioning Exhaust Fan Ventilator Thermal Panel Dehumidifier Heat Pump Ventilation Dehumidification water Attic roof vent gableProduct details: OS22 solar air heater 2 in 1 Function: 1. Heating outdoor fresh air, applicable in Spring, Autumn and Winter; 2. Heating indoor air internal circularly. This mode is the best way to heat the room. Applicable to OS22 32 42. Model No. OS22 Appro room area 40m2 Maximum air volume 98m3 h Time for air change Approximate 2 hours Heating efficiency 72% Sun intensity performance(w h set ) 550W Total Annual Heating Delivered (9months) 720 KWh