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External Air vs Open Air

What is the difference between External Air and Open Air?


External Air:

No prescribed window shall be deemed to face into the external air unless:

(a) it faces into a street which is not less than 4.5 m wide; or

(b) it faces into a space uncovered and unobstructed above the area delineated by the rectangular horizontal plane; and

(c) it is so placed that, if another rectangular plane, the base whereof is equal to and common with the base of the rectangular horizontal plane, is inclined, above the rectangular horizontal plane, at an angle of 71 1/2° from the horizontal where the window is in a room used for habitation or 76° from the horizontal where the window is in a room used for the purposes of an office or as a kitchen, no part of the building, or of any other building within the site on which such building is erected, protrudes above such plane; or (G.N.A. 97 of 1962)

(d) where such window opens on to an area bounded on the side opposite the window by a boundary of the site on which the building is erected, such window is so placed that, if the rectangular horizontal plane is projected to such boundary and, from the position at which it first intersects the boundary, another rectangular plane, the base whereof is parallel and level with the sill of the window and has a length equal to the length of the base of the rectangular horizontal plane, is projected, towards the site and above the rectangular horizontal plane, at an angle of 80 1/2° from the horizontal where the window is in a room used for habitation or 83° where the window is in a room used for the purposes of an office or as a kitchen, no part of the building, or of any other building within such site, protrudes above such inclined plane: (G.N.A. 97 of 1962) Provided that, where there is a service lane or street less than 4.5 m wide adjacent to and parallel with such boundary, the boundary shall, for the purposes of this subparagraph be deemed to be at a position 1.5 m beyond such boundary. (L.N. 54 of 1969)


Open Air:

A space which—

(a) is vertically uncovered and unobstructed;

(b) is not less, in any horizontal dimension, than 1.5 m; and

(c) where such space is enclosed on 4 sides, it needs to have a horizontal area of not less than 1 m2 for every 6 m of the mean height of the walls enclosing the space


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