... .durable 3.long-lifetime 4.Low failure rate 1.Materials :Aluminium Alloy. stainless steel etc.2.Thickness:1.5mm 3.Size:80 ... diffuser,air grille,damper,quadrant handle,bushing,duct corner,clamp,latch,spindle…..To more more about us,please browse site aluminium alloy ventilating fan