工业门

Features: 1) Outside is zinc-plated steel planks; high performance and rustproof 2) Thickness: 40/50mm 3) Door is steel/polyurethane/steel construction 4) Heat insulating coefficient: R=20.15 5) The U-tube rubber at the bottom along with the top and side seals are tight, keeping out wind, dirt and water 6) All the metal tightening parts are made of galvalized steel 7) Torsion spring can be used for more than 100,000 times 8) It has a quick stop system when meeting obstacles