... Excellent energy saving: set heat recovery inside, exchange the exhausted air and supply air, recovery efifciency up to 90%, ... bellows being 2.0mm, wide surface area of transferring heat, high heat recovery. ( function(){ var aBigImageSrc = [ 'http://i01 ... (); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Rotary heat recovery equipment, with cooling, heating system, filter function