Q: Is there a maximum time required for doors to automatically close? This question came up in a recent department meeting and we cannot find any code reference that specifies how quickly a door must close.
A: It depends if the door is a swinging type or sliding type. The LSC and NFPA 80 Fire Doors and Fire Windows (1999) does not specify the amount of time that a closure must close a swinging door, whether it be for a fire rated door or a non-fire rated door. However, section 4-4.1.1 and 4-4.1.2 of NFPA 80 requires horizontal sliding doors to have a delay of no more than 10 seconds in the initiation of the closing, and the average speed of the closing must be between 6 and 24 inches per second. I suggest you ask your local AHJ if they have a requirement other than NFPA that addresses this issue.