Panic Hardware Operating Force and What a Failure Points At

Three separate forces are measured and they fail for different reasons. RELEASE FORCE is the bar itself, and a high reading points at the device: binding, a bent bar, a latch dragging on a misaligned strike, or a device that has never been lubricated. SET-IN-MOTION and SWING forces are the door, and a high reading there points at the closer, the hinges, or a pressure difference across the opening. A 36 in fire-rated stair door measuring 9 lbf release, 34 lbf to set in motion, and 12 lbf to swing has a bar that is fine and a door that is not: release passing while set-in-motion fails by 4 lbf is the signature of something HOLDING THE DOOR SHUT, and on a stair door that is almost certainly stairwell pressurization. Replacing the exit device would change nothing; the fix runs through the mechanical system, checking the pressure difference with the fans in their worst-case mode. Adjusting the closer down would help the reading and hurt the door's ability to close and latch, which on a rated stair door is not an acceptable trade. The geometry checks travel with the forces: the actuating portion must span at least half the leaf width -- 18 in on a 36 in door -- and the bar must sit between 34 and 48 in above the floor. And fire exit hardware carries a constraint that gets violated with good intentions: on a rated door the latch must engage, so a device dogged down to make a door swing freely for convenience has defeated a fire door, and only listed fire exit hardware without a dogging feature belongs on a rated opening. A force comparison against limits the user supplies. The limits, how and where the force is measured, and the exceptions differ between the building code, the life safety code, and the accessibility standards. It does not determine whether panic hardware is required for the occupancy and occupant load, address delayed or controlled egress, evaluate the fire door assembly or its annual inspection, or compute the pressure difference across the door. A door that will not open under crowd load is a fatality mechanism: the adopted building and fire codes, the hardware listings, and the AHJ govern.

each measured force is compared to its own entered limit; the actuating portion must be at least half the door leaf width; the bar must sit between 34 and 48 in above the floor.

The egress door operating force limits by name -- release of the latch, force to set the door in motion, and force to swing it to full open, each measured separately -- with the actuating portion and mounting height requirements named, and NFPA 80 cited for rated doors. Limits are entered from the adopted code.

Comparison of the user's own gauge readings against limits they enter; no code table is reproduced.

Estimate. AHJ and licensed professional govern.

Field names used by the API: release_force_lbf, set_in_motion_lbf, swing_force_lbf, release_limit_lbf, set_in_motion_limit_lbf, swing_limit_lbf, door_leaf_width_in, actuating_portion_in, mounting_height_in, release_margin_lbf, set_in_motion_margin_lbf, swing_margin_lbf, required_actuating_in

• Three forces, three different causes release points at the device; set-in-motion and swing point at the door and its environmentegress hardware practice
• Pressurization can fail a compliant door the building holds it shut, and adjusting the closer trades a reading for latchingadopted building code
• Dogging a rated door defeats it only listed fire exit hardware without a dogging feature belongs on a rated openingNFPA 80