Double fire doors are available with or without windows, depending on the site usage. The double-opening fire door is made of galvanized steel plate, which is not easy to be deformed, and is fireproof and moisture-proof.

https://ztfiredoor.com/21191.html

UL 1 hr fire door,1 hour fire check doors,prehung fire rated steel doors,pre hung fire rated doors,front fire door,20 minute fire rated interior door,UL 1 hr fire door,60 minute fire rated door,prehung fire rated steel doors,front fire door,fire rated double pocket doors,UL 1 hr fire door,fire rated door house to garage,prehung fire rated steel doors,insulated fire door,front fire door