B3. Landing doors
B3.l.l. The openings in the well giving access to the lift car
should be provided with imperforate doors. When closed, those
doors should completely cover the openings, subject to the
necessary clearance, which should be as small as possible and in
any case less than ¼in. (6mm).
B3.2. Strength of landing doors and their frames
B3.2.l. (1) Doors and their frames should be so constructed
that the doors will not become deformed in the course of time.
It is recommended that metal doors should be used in all cases.
(2) The use of glass, even wired glass, or of plastic material
should be allowed only for vision panels. The horizontal dimen-
sion of such vision panels should not be more than 6in. (15cm).
B3.2.2. Landing doors should comply with the fire prevention
and protection rules in the country where the lift is installed.
Without necessarily being as fire-resistant as the walls of the well
onto which they open, landing doors should afford a degree of
protection against fire corresponding to that required for those
B3.2.3. Doors, including vision panels (if any) and locks,
should have adequate strength and rigidity.'
'In this respect the following criterion could be adopted: locked landing
doors should withstand without permanent deformation a horizontal force of
661bf (3Okgf or 3OdaN) applied at any point on either side of a door panel,
this force to be evenly distributed over an area of 4sq.in. (25cm2) in a round
or square section. After this test the doors should function normally.