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(b) that any steps necessary for access to any part
of the building comprising the room may be
placed in or over such area if they are so placed
as not to be over or across any window of
the room required by the regulation in that
behalf.
8.—(i.) The room shall be effectually lighted by means of one
or more windows opening directly into the external
air.
(ii.) Every such window shall be so constructed that onehalf
at the least may be opened and that the opening
may extend to the top of the window.
(iii.) The total area of such window or windows clear of
the sash frames shall be equal at the least to oneeighth
of the floor area of the room and a portion of
such total area equal in extent to at least one-tenth
of such floor area shall be so situated that a line
making an angle of thirty degrees with a horizontal
plane can be drawn upwards from any point thereon
in a vertical plane at right angles to the plane of the
window so as not to intersect within a distance of
ten feet measured horizontally from the window any
wall of any area adjoining the room or any other
wall or any kerb or other obstruction except an
open fence.
For the purposes of this paragraph a bay window
having side lights shall be assumed to be equivalent
to a flat window of the same area and of the same
height in relation to the room and situated at a
distance from the outside area wall equal to the
mean width of the area.