The steel fireproof door can be provided with window, shutter, ventilation shutter, etc. as required.

https://ztfiredoor.com/18924.html

12×12 fire rated access panel,12 x 12 fire rated access panel,12×12 fire rated ceiling access panel,120 min fire rated door,16×16 fire rated access panel,120 minute fire door,12×12 fire rated access panel,fire proof doors for sale,12×12 fire rated ceiling access panel,16×16 fire rated access panel,18×18 fire rated access panel,12×12 fire rated access panel,1 hour rated door,12×12 fire rated ceiling access panel,1 hour rated access panel,16×16 fire rated access panel