According to NFPA 80, the maximum undercut allowed for rated fire doors is how many inches?
A.
1/2
B.
3/4
C.
5/8
D.
1
The Answer Is:
B
This question includes an explanation.
Explanation:
NFPA 80 (Standard for Fire Doors and Other Opening Protectives) sets requirements for fire door construction and installation. It specifies that the maximum undercut clearance is 3/4 inch unless otherwise tested and listed. Greater clearances compromise the integrity of the fire barrier.