... 2.Application:YUTONG,RAFERALSTON 3.Material:ABS, aluminium-platic fan Fresh air damper specification:Material:ABS, aluminium-plastic fan, 3M filter, replaced nut ... °-- 85°LifeMax. 500,000cycleDimensions470*135*70mmWeight945gQuality certificateTS16949/ISO9001BUSINESS PARTNER Fresh Air Damper