Air collector OS20 Solar air Heater heating air Conditioner Conditioning Exhaust Fan Ventilator Thermal Panel Dehumidifier Heat Pump Ventilation DehumidificatioNakoair Solar air heater No cost for heating Ventilation Dehumidification Humidification Healthy indoor climate. Avoid moisture, mold, fungus, formaldehyde (HCHO), TVOC, benzene, ammonia, odor. Nakoair solar collectors provide you with a healthy and warm home and automatically processes indoor air. When it's a sunny day, OS20 30 will heat outdoor fresh air all the time. Runs completely independent of the grid. Applications: Holiday Homes; Residential;