Rolling & Sliding Fire Doors
NFPA 80 Chapter 7 — Opening Protectives Beyond the Swinging Leaf

The FACP sends an electrical release signal to the motorized operator, driving the door closed. This is the primary closing trigger for WON-Door and similar motorized horizontal sliding/folding assemblies — there is no fusible link. NFPA 80 §7.4.3 permits a listed releasing device connected to an approved automatic detection system in place of a fusible link, and that is exactly how these assemblies are configured. Verifying the FA interface wiring is connected and confirmed-active is a mandatory annual drop test item.

A smoke detector near the opening can trigger closure earlier — before fire temperatures develop. NFPA 101 and CMS/TJC require smoke-actuated closure at healthcare corridor separations and smoke compartment boundaries, making smoke detection a practical requirement in those locations even when NFPA 80 treats it as optional.

A sealed battery in the controller enclosure ensures the motorized operator can close the door during a power outage. Capacity is specified in the listing documentation — substituting a smaller battery affects the listed assembly performance. Verified annually with AC power disconnected before marking the test passed.

A two-piece metal link held together by a temperature-rated alloy (commonly 165°F, 212°F, or 286°F). When fire heat melts the alloy, the link separates and the curtain drops under gravity or spring tension. Zero electricity required — the mechanical failsafe that operates independently of fire alarm systems, power, and batteries. NFPA 80 §7.5.4 requires the fusible link to be correctly rated for the hazard and positioned at the door.

Motorized vertical coiling assemblies may supplement the fusible link with a smoke detector or FA signal interface for earlier closure — before temperatures reach the link threshold. At healthcare smoke compartment boundaries, NFPA 101 and CMS/TJC may effectively require it. For gravity-close only assemblies, this layer is absent.

Gravity-close assemblies do not need battery backup — the curtain falls under its own weight when the fusible link releases. Motorized assemblies that add an electric operator require battery backup so the motor can close the door even before the fusible link releases.

The alarm chirps overhead. She hears it before she sees anything — then the corridor ahead changes. A wall that was never there begins to materialize. Corrugated panels unfold out of a pocket she never noticed, sweeping silently across the 18-foot opening, following the slight curve of the hallway.

Eight seconds later, the corridor is sealed. She stops. I need to get back to my patients. Then she sees the green bar. “PUSH TO OPEN.” She pushes. The leading panel folds back into its pocket with a soft mechanical sigh. She steps through. The door closes behind her. If no one had shown her this bar, she would have stood there in a real emergency, convinced she was trapped, while the actual egress route was three inches from her hand.

He does not touch the wall station yet. He walks the door first — the whole assembly, pocket to frame — because the paperwork deficiencies are the ones that get missed when you go straight to the drop test.

Travel zone: is anything in the path? A linen cart parked at the pocket edge, an IV pole stored against the wall, floor markings worn to nothing — all of that goes on the report before the door moves. Panels: visible dents or buckled slats from a prior impact? Any cracked or missing seals along the panel edges? Listing label: legible on the frame and on the panels? He photographs it. Inspection tag: is one present, and is the date current or has it expired? An overdue tag is a finding even if the door passes the drop test. He writes each item up before calling for the technician.

He commands the door from the wall station and hits the stopwatch the instant the first panel moves. He is already moving toward the floor.

By the time the leading edge reaches the frame he is on his knees, face at floor level, looking for light under the seal. Any gap — anywhere along the bottom bar — is a finding. He notes the travel time: 8 seconds on AC power. Then he goes to the controller panel, opens it, and disconnects AC at the breaker. Commands the close again. Stopwatch. The door takes 11 seconds on battery — that goes in the record verbatim. He checks the battery voltage with a meter: 12.4 VDC. He photographs the controller display, the breaker, and the voltage reading before he reconnects power. He also listens — there is a slight metallic skip on the third panel hinge that has been there since the last ITM. He flagged it then. He is flagging it again today, in writing, because the next time that hinge binds mid-travel it will stop the door short of the frame.

WON-Door Firewall and similar accordion designs include emergency egress bars — the green "PUSH TO OPEN" bars on the leading panel edge. An occupant pushes the panel; the accordion compresses back into the pocket, the person passes through, and the door re-closes automatically. NFPA 80 §6.1.8 requires fire door assemblies in a means of egress to be operable from the egress side. Vertical coiling (rolling steel) doors generally do NOT have manual egress provisions unless the listing specifically includes them — which is exactly why they belong in non-egress openings, not corridors that serve as primary means of egress.

The annual inspection for rolling and sliding types is actually more involved than for a swinging door — it requires a full operational drop test, battery backup verification with AC power disconnected, fusible link inspection (where applicable — vertical coiling types), track and panel condition check, floor seal confirmation, egress bar operation verification, and documentation. Skipping the drop test because the door "looks fine" is a direct NFPA 80 violation and a CMS / TJC citation.

A dead controller battery, a tripped circuit breaker, a corroded or bypassed fusible link, a motor that seized, or a wiring connection that worked itself loose — any of these fails the door independently of whether the fire alarm is functional. The annual drop test exists precisely because the door must be proven to close as an integrated system under real conditions.

The test procedures differ because the pressure dynamics of a sliding or coiling door differ from a swinging leaf. A 90-minute UL 10B rating and a 90-minute UL 10C rating both protect the same 2-hour wall opening, but the listing is type-specific — you cannot substitute one for the other. The AHJ will cite an installation where the wrong door type was specified for the opening.

DH Pace Company — Who We Call

For rolling and sliding fire door service and annual NFPA 80 drop tests at Samektra-managed facilities in metro Atlanta and Gwinnett County, DH Pace is our go-to contractor. They know these assemblies the way an ITM specialist knows a fire pump — the WON-Door accordion, the rolling steel coiling curtain, the motorized operator box, and the controller that ties back to the FACP.

DH Pace is one of the largest professional door, dock, and hardware service companies in the United States, with more than 60 locations and crews trained specifically on commercial fire-rated assemblies. Their technicians carry out the full annual drop test — battery backup verification with AC power disconnected, FA interface confirmation, floor seal and label inspection, egress bar function, full-travel operational test — and hand you the signed documentation you need to satisfy TJC and CMS surveyors. When a controller fault or a drop test failure turns up during an ITM round, DH Pace is who we call to get the deficiency closed.