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32
Ventilation and Lighting
6. The room shall have a window or windows as specified
in paragraph (i) of this regulation for the purposes of ventil¬—
ation, and in paragraph (ii) for the purposes of lighting: -
(i) One or more windows which can be opened at
the top directly into the external air to an
extent equivalent in aggregate area to not
less than one-twentieth of the area of the
floor or the room.
(ii) One or more windows having an aggregate area
clear of the window frame amounting to not
less than one-tenth of the area of the floor of
the room, and so situated that from any point
thereon, or, if the total window area exceeds
the foregoing minimum requirement, from any
point on a part or parts thereof which satisfy
that requirement, a line can be drawn upwards
at an angle of thirty degrees with the horizontal
in a vertical plane at right angles to the plane
of the window without intercepting any obstruction
except an open fence within a distance of ten feet
measured horizontally from the window.
For this purpose a bay window with side lights
shall be deemed to be a flat window equal in area
to the sum of the areas of the front and side lights 5
situated at a distance from the face of the wall
from which it projects equal to half the maximum
depth of the projections
7. Immediately outside any window provided in pursuance
of these regulations there shall be an unobstructed space which
shall conform with the following requirements:
(i) The space shall extend throughout the entire width
of the window and (except where the area of such
window is not less than one-seventh of the area
of the floor of the room) for two feet on each side
of the window,
(ii) The space shall in every part extend for not lesss than
two feet from the external wall of the room except
that, where the window is a bay window with side