Stairwell Door Closers
for Fire-Rated Exit Stairs

Why Stairwell Doors Need a Dedicated Closer Strategy

Stair doors are the most code-sensitive doors in most buildings. An enclosed exit stair is a protected escape route: if one door is propped open or fails to latch, smoke can fill the stair on every floor. That is why stair doors must be self-closing and positively latching, and why fire marshals check them first during inspections. The closer is part of the listed fire door assembly, so it must be UL listed for use on rated doors.

• Fire rating: interior exit stairways are typically enclosed with 1-hour or 2-hour construction depending on building height, with 60-minute or 90-minute rated doors. Confirm the label on each door and frame.
• Self-closing and latching: required by NFPA 80 and the IBC for fire door assemblies; the door must close and latch from any open position.
• Hold-opens: only allowed when released automatically by the fire alarm or a smoke detector. Wedges, kick-down stops and hook-and-eye holders are violations.
• Re-entry and locking: stair re-entry rules affect the lock or exit device, not the closer, but the closer must still bring the door fully into the latch.

Pressurized Stairwells and Stack Effect

In high-rise buildings, stairs are often pressurized to keep smoke out, and stack effect pushes air through stair doors all winter. Both create pressure on the door. The closer needs enough power and a firm latch speed to close against it, yet NFPA 101 limits the force needed to open egress doors (in general, 30 lbf to set the door in motion and 15 lbf to release the latch). The way to balance both is an adjustable closer, set with the pressurization system and HVAC running, then verified with a door pressure gauge.

Under the 2010 ADA Standards for Accessible Design (section 404), interior hinged doors must open with no more than 5 lbf, and a closer must be adjusted so the door takes at least 5 seconds to swing from 90° to 12° from the latch. Fire doors are the exception on opening force: the authority having jurisdiction sets the minimum. Always check local code and your AHJ.

Specifying Stairwell Door Closers

1. Read the fire label on every stair door and frame (60, 90 minutes or 3 hours).
2. Record door weight, width and swing; stair doors are usually heavy hollow metal.
3. Choose the arm position: parallel arm keeps the arm out of the stair path and protects it from abuse.
4. Note any stair pressurization or stack effect and set the closer with systems running.
5. Log every stair door for the annual NFPA 80 fire door inspection.

Learn more in our guides to fire-rated door closers (UL and NFPA 80) and door closer mounting types. Stair doors in tall buildings are covered on our office building and apartment pages, and exposed stair towers on our parking garage page.

DRIWON DN-9500 Specifications

Need the lighter-duty option for interior doors? See the DRIWON DN-8220 Grade 1 door closer. Full details on the DN-9500 product page.