Dacheng brand mechanical door shelter New developed products which widely use in warehouse door,ensure to seal the clearence between warehouse door hole and the truck 1.Material:Special industrial filber 2.Strength hardware as frame 3.Suit for various door hole dimention 4.Standard front seal contact area:500-800mm(width) 5.Temperature-holding,dust-proof when truck lean on the shelter and proceed loading or unloadings.