... %, 1, Excellent energy saving: set heat recovery inside, exchange the exhausted air and supply air, recovery efifciency up to 90%,2, runner ... and mechanical belt lock,5,adopt thick aluminium foil and recovery heat with with the height of the bellows being 2 ... .0mm, wide surface area of transferring heat, high heat recovery. ( function(){ var aBigImageSrc = [ 'http://i01.i.aliimg.com/photo/v3 ...