SHUOTIAN Industrial Auto Door

* Outside is zinc-plated steel planks; high performance and rustproof

*Thickness of Framwork: 1.5-3mm 

* Door is steel/polyurethane/steel construction

*Heat insulating coefficient: R=16.04/20.15

*The U-tube rubber at the bottom along with the top and side seals are tight, keeping out wind, dirt and water

*All the metal tightening parts are made of zinc-plated steel

*Twisted spring can be used for more than 100,000 times

*It has a quick-stop system.