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floor or grade below. The guards shall be constructed in accordance with Section 824.0 Except~on: Guards are not required on the loading side of loading docks and the auditorium side of stages and raised platforms. (SECTION 813.0 MEANS OF EGRESS DOORWAYS) 813.4.1 Locks and latches: All means of egress doors shall be readily openable from the side from which egress is to be made without the use of a key or special knowledge or effort· Exceptions: Key operation is permitted from a dwelling unit provided the key cannot be removed from the lock when the door is locked from the side from which egress is to be made. 2. Locking devices conforming to Section 610.3.2 shall be permitted in buildings of use group 1-2. 3. Locks conforming to Section 611.5 shall be permitted in buildings of use group 1-3. Egress doors from individual dwelling units and guest rooms of use group R having an occupant load of ten (10) or less are permitted to be equipped with a night latch, dead bolt. 5. Special locking arrangements conforming to Section 813.4.1.2. In buildings of Use Groups B, F, M and S, the main exterior means of egress door is permitted to be equipped with a key-operated locking device from the egress side where in compliance with the following three conditions: a. The locking device is of a type that is readily distinguishable as locked. A readily visible, durable sign is posted on the egress side on or adjacent to the door stating "This Door To Remain UnlockedWhen This Building Occupied". The sign shall be in letters not less than i inch (25 mm) high on a contrasting background. The main entrance door is a single door or a pair of doors which, when unlocked, the door or both leafs of a pair of doors swing free. In any existing building, key operation is permitted from a dwelling unit provided the existing dwelling unit egress door contains a glass panel or is located immediately adjacent to an existing window or fixed glass panel. 11