The steel fire door is made of high-quality preferred stainless steel plates – hot-dip galvanized cold-rolled thick steel plates on both sides.

https://ztfiredoor.com/20109.html

3 panel fire rated door,28 inch fire rated door,fire rated doors for hospitals,interior doors fire doors,ul fire rated door,fire door seal,3 panel fire rated door,2 hours fire rated door,ul fire rated door,fire doors rated 90 minutes,fire rated doors for hospitals,2 hour fire rated door price,3 panel fire rated door,fire door internal,fire rated doors for hospitals,ul fire rated door