1010.1.4.3 Special purpose horizontal sliding, accordion or folding doors .

In other than Group H occupancies, special purpose horizontal sliding, accordion or folding door assemblies permitted to be a component of a means of egress in accordance with Exception 6 to Section 1010.1.2.1 shall comply with all of the following criteria:

   1.   The doors shall be power operated and shall be capable of being operated manually in the event of power failure.

   2.   The doors shall be openable by a simple method from both sides without special knowledge or effort.

   3.   The force required to operate the door shall not exceed 30 pounds (133.4 N) to set the door in motion and 15 pounds (66.7 N) to close the door or open it to the minimum required width.

   4.   The door shall be openable with a force not to exceed 15 pounds (66.7 N) when a force of 250 pounds (1112 N) is applied perpendicular to the door adjacent to the operating device.

   5.   The door assembly shall comply with the applicable fire protection rating and, where rated, shall be self- or automatic closing by smoke detection in accordance with Section 716.5.9.3, shall be installed in accordance with NFPA 80 and shall comply with Section 716 of this code.

   6.   The door assembly shall have an integrated standby power supply.

   7.   The door assembly power supply shall be electrically supervised.

   8.   The door shall open to the minimum required width within 10 seconds after activation of the operating device.

   9.   The door shall not be provided with a latch or lock other than panic hardware or fire exit hardware complying with Section 1010.1.10.

1010.1.4.4 Security grilles.

In Groups B, M and S, horizontal sliding or vertical security grilles are permitted at the main entrance where the opening of such grilles are essential to the operation of the establishments. Such grilles shall be installed in accordance with the following criteria:

   1.   Security grilles shall be openable from the inside without the use of a key or special knowledge or effort during periods that the space is occupied.

   2.   The security grilles shall remain secured in the full-open position during the period of occupancy by the general public.

   3.   Except as to buildings or structures classified in occupancy Group S, buildings or structures that have been designated as a landmark by the landmarks preservation commission or located in a historic district designated by such commission, on or after July 1, 2011, no security grille may be installed or replaced, nor shall the owner of a structure classified as a Group B or M occupancy or the operator of the business occupying such structure allow to be installed or replaced, a security grille to secure such property where the grille abuts the sidewalk, unless the grille, when closed, permits visibility from the sidewalk of at least 70 percent of the area covered by such grille.

   4.   No later than July 1, 2026, all security grilles installed on buildings or structures classified in occupancy Groups B or M shall comply with the provisions of Item 3 of this section.

   5.   Where two or more means of egress are required, not more than one-half of the exits or exit access doorways shall be equipped with horizontal sliding or vertical security grilles.

1010.1.5 Floor elevation.

There shall be a floor or landing on each side of a door. Such floor or landing shall be at the same elevation on each side of the door. Landings shall be level except for exterior landings, which are permitted to have a slope not to exceed 0.25 unit vertical in 12 units horizontal (2-percent slope).

   Exceptions:

      1.   Doors serving individual dwelling units in Groups R-2 and R-3 where the following apply:

         1.1.   A door is permitted to open at the top step of an interior flight of stairs within the dwelling unit, provided the door does not swing over the top step.

         1.2.   Screen doors and storm doors are permitted to swing over stairs or landings.

      2.   Exterior doors as provided for in Section 1003.5, Exception 1, and Section 1022.2, which are not on an accessible route.

      3.   In Group R-3 occupancies not required to be Accessible units, Type B+NYC units or Type B units, the landing at an exterior doorway shall be not more than 7 3/4 inches (186.9 mm*) below the top of the threshold, provided the door, other than an exterior storm or screen door, does not swing over the landing.

* Editor's note: As set forth in L.L. 2021/126; correct conversion should be 196.9 mm.

      4.   Variations in elevation due to differences in finish materials, but not more than 1/2 inch (12.7 mm).

      5.   Exterior spaces of Type B+NYC units and Type B units where permitted pursuant to the exception to Section 1107.4.

      6.   Doors serving equipment spaces not required to be accessible in accordance with Section 1103.2.9 and serving an occupant load of five or less shall be permitted to have a landing on one side to be not more than 7 inches (177.8 mm) above or below the landing on the egress side of the door.

1010.1.6 Landings at doors.

Landings shall have a width not less than the width of the stairway or the door, whichever is greater. Doors in the fully open position shall not reduce a required dimension by more than 7 inches (177.8 mm). At any stairway landing, or when a door landing serves an occupant load of 50 or more, doors in any position shall not reduce the landing to less than 75 percent of its required width. Landings shall have a length measured in the direction of travel of not less than 44 inches (1117.6 mm).

   Exceptions:

      1.   Landing length in the direction of travel in Groups R-3 and U and within individual units of Group R-2 need not exceed 36 inches (914.4 mm).

      2.   In Group R-2 occupancies, where 36 inch wide stairways are permitted pursuant to Section 1011.2, Exception 1.2, such stairway landing length in the direction of travel shall be permitted to be not less than 36 inches (914.4 mm) or the width of the stairway, whichever is greater. Doors opening onto such stairway landings shall not reduce the landing width.

1010.1.7 Thresholds.

Thresholds at doorways shall not exceed 3/4 inch (19.1 mm) in height above the finished floor or landing for sliding doors serving dwelling units or 1/2 inch (12.7 mm) above the finished floor or landing for other doors. Raised thresholds and floor level changes greater than 1/4 inch (6.4 mm) at doorways shall be beveled with a slope not greater than one unit vertical in two units horizontal (50-percent slope).

   Exceptions:

      1.   In occupancy Group R-2 or R-3, threshold heights for sliding and side-hinged exterior doors shall be permitted to be up to 7 3/4 inches (196.9 mm) in height if all of the following apply:

         1.1.   The door is not part of the required means of egress.

         1.2.   The door is not part of an accessible route as required by Chapter 11.

         1.3.   The door is not part of an Accessible unit, Type B+NYC unit or Type B unit.

         1.4.   The exterior door, other than a storm or screen door, does not swing over the landing or step.

      2.   In Type B+NYC units and Type B units, where permitted pursuant to the exception to Section 1107.4, the threshold height on the exterior side of the door shall not exceed 4 3/4 inches (120.7 mm) in height above the exterior deck, patio or balcony for sliding doors or 4 1/2 inches (114.3 mm) above the exterior deck, patio or balcony for other doors.

1010.1.8 Door arrangement.

Space between two doors in a series shall be 48 inches (1220 mm) minimum plus the width of a door swinging into the space. Doors in series shall swing either in the same direction or away from the space between the doors.

   Exceptions:

      1.   The minimum distance between horizontal sliding power-operated doors in a series shall be 48 inches (1220 mm).

      2.   Storm and screen doors serving individual dwelling units in Groups R-2 and R-3 need not be spaced 48 inches (1220 mm) from the other door.

      3.   Doors within individual dwelling units in Group R-3.

      4.   Doors within individual dwelling units in Group R-2 that are not required to comply with Section 1107.

      5.   Exterior doors in vestibules in Group R-2 occupancies shall not be required to swing either in the same direction or away from the space between doors provided that the 48-inch (1220 mm) minimum space between door swings is maintained.

1010.1.9 Door operations.

Except as specifically permitted by this section egress doors shall be readily openable from the egress side without the use of a key or special knowledge or effort.

1010.1.9.1 Hardware.

Door handles, pulls, latches, locks and other operating devices on doors required to be accessible by Chapter 11 shall not require tight grasping, tight pinching or twisting of the wrist to operate.