Resource from: SEPPES The door employs a versatile PVC curtain and guides it up and down speedily together aluminum alloy rails. Resource from : SEPPES Structural Features: Doorway panels consist of a steel composite layer + polyurethane insulation layer, divided into sections for sliding and lifting. Spiral® LP (Reduced Profile) https://portonipercapannoni54197.blog2learn.com/85483377/what-does-warehouse-doors-mean