Can a Fire-Rated Door Have a Hold-Open? What NFPA 80 Allows — Q&A Guide

Yes, only as an automatic-closing assembly. NFPA 80 Section 6.1.4 requires a closing device that returns the door to the closed and latched position, so the hold-open must be released by the fire alarm. A person-released hold-open, including Waterson's own C and D sets, belongs on non-rated doors; on the rated door Waterson supplies the K51M A set as the listed closing device and an electromagnetic holder does the holding.

Two builds: a listed electromagnetic holder plus a separate listed closing device, or a surface closer with integral electromagnetic hold-open. Waterson recommends the first: the K51M A set is UL Listed (GVEV.R26997), certified to ANSI/BHMA A156.17 Grade 1, permitted by NFPA 80 on assemblies rated up to 3 hours, with no closer arm on the door face. Schedule both: holder in Division 28, hinges in Division 08.

Waterson asks this before quoting almost every hold-open inquiry, because many labeled slabs hang in non-rated walls. The rating that governs is the one the code requires for the opening (corridor, stair, occupancy separation, shaft); the labels, life-safety drawings, and authority having jurisdiction settle it. A labeled door in a non-rated partition can run as a non-rated opening, which opens it to the Waterson C or D set.

Waterson K51M and K51L are UL Listed self-closing hinges (GVEV.R26997), ANSI/BHMA A156.17 Grade 1 (1,000,000 cycles), permitted by NFPA 80 on assemblies rated up to 3 hours. The hold-open in the C and D sets is a mechanical SB hinge that parks the door at 85° ± 5° and releases only when someone pushes the leaf, so it is offered for non-rated doors; the A set is the fire-door closing device.

Yes. The D set (DS · HA · SB) pairs hydraulic damping with the 85° hold-open; the C set (SB · SA · SA1) pairs it with mechanical friction brakes. Per Waterson's technical team, only the hydraulic model delivers anti-slam damping at the end of travel; the mechanical model gives self-closing with swing- and latch-speed control. Both are for non-rated doors in 2- and 3-hinge sets.

A light push or pull releases it, and the spring closes the door under speed control. It is enabled or disabled at the lower barrel with a 5 mm hex key. Because it can be re-enabled the same way, Waterson specifies a set with no SB hinge for fire doors (the A set, or a B set combined with mechanical hinges; ask Waterson) rather than a disabled C or D set.

The brake holds the door against the spring force at 85°, and four or five springs together exceed what it is designed to hold. Waterson supplies the built-in hold-open in 2- and 3-hinge sets; 4-hinge doors (up to 8 ft and 330 lbs) normally ship as A or B sets, so ask Waterson before specifying hold-open on one.

Thickness: 2-1/8 in is 54 mm, inside the 44.5–63.5 mm band, so K51M-500 or the heavy-weight K51M-500D for a dense slab. Height: 81 in is 6'9", above the 6'8" two-hinge ceiling, so 3 hinges (rated to 7'0" and 260 lbs); above 260 lbs, 4 hinges. A required fire door takes the A set; a non-rated door wanting hold-open takes the C3 or D3 set.

Fire door with hold-open: "Self-closing hinges: UL Listed, certified to ANSI/BHMA A156.17 Grade 1, permitted by NFPA 80 on fire door assemblies rated up to 3 hours (Waterson K51M-500, A set, 3 hinges). Hold-open: listed electromagnetic door holder released by fire alarm; door shall close and latch on release." Non-rated door: "Self-closing hinges with integral hold-open at 85° (Waterson K51M-500, C3 or D3 set)."

At the annual inspection (NFPA 80 Section 5.2.3.5.2) the inspector operates the door from fully open, confirms it closes and latches under its own closing device, and looks for auxiliary hardware that interferes with its function (kick-down stops, wedges, magnetic catches). On an automatic-closing door the holder is dropped on test and the Waterson hinges latch the door. Steel shims for hinge alignment are permitted under Section 6.4.3.