The size of the hole should comply with the relevant provisions of GB/T 5824, and the special size of the hole can be determined by the manufacturer and the user according to the needs of negotiation.



Fire door dimensions are mainly based on the "Building Door and Window Dimensions Series" GB/T 5824-2008, Table 1,2.



In short, it is generally the following empirical numbers:

Single fire door 900 wide (1000) X2100 high (2200, 2300)

Double fire doors 1200 wide (1500, 1800, 2100)X2100 high (2200, 2300)

No bigger.



It is required to re-certify the production qualification of double fire doors with opening dimensions greater than 2100X2300 and single fire doors with opening dimensions greater than 1000X2300. Most manufacturers cannot produce fire doors that exceed specifications.