The thermal deformation rate of the steel fire door is low, and the bending curvature of the deformation after heating is low. Steel fire door when the fire opens, it can freely open to escape or close the smoke evacuation and wait for rescue.

https://ztfiredoor.com/19902.html

a fire door,metal fire door,34 inch fire rated door,internal fire doors prices,fire rated aluminum storefront doors,a fire door,overhead fire door,metal fire door,fire rated attic door,internal fire doors prices,therma tru 20 minute fire rated doors,a fire door,fire rated internal stable door,metal fire door,2hr fire rated door price,internal fire doors prices