B-5.2.2 Internal Passages

Intensity in use of the corridor shall be a criterion when establishing the minimum width and length of the corridor (see Fig. 41). The minimum unobstructed width of corridors shall be 1 500 mm, with a preference for a width of 1 800 mm.

Where less than 1 800 mm wide, a corridor shall be provided with passing places, 1 800 mm wide and at least 1 800 mm in length at reasonable intervals. These dimensions shall be exclusive of handrails and any other projections, for example portable fire extinguishers, notice boards, etc.

Adequate circulation space, where a doorway exists, shall be provided (see B-5.3).

Changes of direction within a corridor shall have a turning circle with a diameter of $1500\mathrm{mm}$ or more, clear of any obstructions (see Fig. 42).

The minimum clear height of corridors shall be 2 100 mm.

Hanging objects on walls should be avoided, except when they comply with B-2.6.2. The minimum unobstructed width shall remain 900 mm.

41A MINIMUM UNOBSTRUCTED WIDTH OF CORRIDOR

All dimensions in millimetres.

FIG. 41 DIFFERENT CORRIDOR WIDTHS DETERMINED BY THE INTENSITY OF USE

B-5.2.3 Turning Space for 90° Turn of a Wheelchair in Corridors

The manoeuvring zone required for a wheelchair to make a $90^{\circ}$ turn shall be designed according to Fig. 42. It shall have no gradient, and it shall not be less than 1 500 mm wide and 1 500 mm long in the direction of travel.

B-5.2.4 Circulation Space for $180^{\circ}$ Wheelchair Turn The space required for a wheelchair to make a $180^{\circ}$ turn shall be not less than 2 000 mm in the direction of travel and not less than 1 800 mm wide.

For landing dimensions, see B-6.2.6.

B-5.2.5 Resting Benches/Seats

In long paths of travel resting areas shall be provided

FIG. 42 SPACE REQUIRED FOR $90^{\circ}$ TURN

at frequent intervals not exceeding $30\mathrm{m}$ complying with B-2.2.1 (g).

B-5.2.6 Protruding Object

Obstacles, projections or other protrusions shall be avoided in corridors, passageways or aisles. Long paths of travel shall be avoided and resting areas shall be provided at frequent intervals not exceeding 30 m. For provision of unavoidable obstacles and protruding objects and protection therefrom, requirements given in B-2.6 shall be followed.