When to use: Select an electromagnetic lock holding force from the door leaf weight, width, and required security level. Standard ratings are 300, 600, 1200, 1500 and 2000 lbf. IBC egress note: mag-locks on egress doors must release per IBC 1010.2.11/1010.2.13 — sensor-release (motion + manual) or door-hardware-release with a listed device, loss of power releases the lock, and signage is required.