Excellent energy saving: set heat recovery inside, exchange the exhausted air and supply air, recovery efifciency ... to 90%, 1, Excellent energy saving: set heat recovery inside, exchange the exhausted air and supply air, recovery efifciency up ... .productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Rotary heat recovery equipment, with cooling, heating system, filter function