Source from: SEPPES The doorway makes use of a flexible PVC curtain and guides it up and down immediately together aluminum alloy rails. Resource from : SEPPES Structural Features: Door panels include a metallic composite layer + polyurethane insulation layer, divided into sections for sliding and lifting. Initial equipment companies https://portoni-per-capannoni30467.humor-blog.com/36829491/warehouse-doors-things-to-know-before-you-buy