Look at our large choice of overhead doorway operators suitable for use with our rolling doors, shutters and grilles. Source from : SEPPES Structural Characteristics: Doorway panels consist of a steel composite layer + polyurethane insulation layer, divided into sections for sliding and lifting. Spiral® LP (Minimal Profile) Superior-performance rigid https://portonipercapannoni20627.thenerdsblog.com/44161952/5-essential-elements-for-warehouse-doors