However, a single exit route is allowed where the number of employees, the size of the building, or the arrangement of the workplace would enable all … Exterior doors in homes and businesses not only provide security, but they also serve as a vital means of egress during a fire or other emergency. With every commercial property, there are numerous interior and exterior doors, and the majority of these doors must be built to the proper size. Where there is only one exit access leading to an exit or exit discharge, the width of the exit and exit discharge must be at least equal to the width of the exit access. Openings more than 24 in (610 mm) in depth shall comply with 4.2.1 and 4.3.3. Fire doors obviously play a significant part when exiting a building and the regulations state where they should be situated within a building to slow down and compartmentalise the spread of fire. Building Codes for Exterior Doors. 1910.36(g)(3) The width of an exit route must be sufficient to accommodate the maximum permitted occupant load of … Exception: The landing or floor on the exterior side shall be not more than 7 3 / 4 inches (196 mm) below the top of the threshold provided the door does not swing over the landing or floor. Clear widths :- The effective clear width through a single leaf door, or one leaf of a double leaf door (clear of any projections from the face of the door such as door furniture and weather boards) should be a preferred 800mm and a minimum 750mm based on a straight-on wheelchair approach as set out in clause 6.4.1 of BS 8300:2001. Any other exterior door has a threshold height limited to 7 ¾ inches. Clear width is 32 inches (815 mm) minimum measured from the one side wall to the face of the opposite side wall. It might be in keeping with and old building ie a small door to an old cottage! Locks shall not require the use of a key for operation from the inside. (3) Each swinging exterior door other than screen or storm doors shall have a key-operated lock that has a deadlocking latch or a key-operated dead bolt with a passage latch. Falling Out. minimum height for external door. Landings or finished floors at the required egress door shall be not more than 1 1 / 2 inches (38 mm) lower than the top of the threshold.. Shedmen Shedmen, Aug 29, 2006 #4. andyscotland likes this. The opening width of the door cannot be reduced either. All exterior sliding glass doors must provide a minimum 28-inch wide × 72-inch high clear opening. Part E – Sound Insulation is relevant to doors, particularly when fitted in an apartment block. mudhut New Member. Maximum Doorway Depth. This is the minimum width required for a passage door. You may also find a few narrower doors in stock, including 30 inches, 28 inches, and 24 inches. Maximum Doorway Depth. 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