Sources of natural light and ventilation

54.

Every room in any building shall be provided with natural light and ventilation by means of one or more sources having an aggregate area of not less than-

Rooms for residential purposes

(a)

15 per cent of the floor space of the room of which atleast 70 per cent shall have openings so as to allow free uninterrupted passage of air, if such room is used for residential purposes [(excluding such room as referred to in paragraph (c)],

If such room is in a low rise building there should be an-unobstructed passage of not less than 2.3 m. between such opening and the boundary of the lot opposite to such opening.

Rooms for business purposes, etc.

(b)

15 per cent of the floor space of the room of which at least 50% shall have openings so as to allow free uninterrupted passage of air, if such room is used for business purposes or in connection with a shop, a place of public resort, a factory or any other usage not mentioned in this regulation;

Storces, garages, etc in residential buildings.

(c)

10% of the floor space of the room of which 50% shall have openings so as to allow free uninterrupted passage of air, if such room is used as a store, pantry , utility room, garage or the like in a residential building.

Water closets toilets and bathrooms

(d)

10% of the floor space of the room or 0.2 m2 (whichever is greater) of which 100% shall have openings so as to allow free uninterrupted passage of air, if such room is a water-closet, latrine, urinal, bathroom, toilet or laundry room;

Schools

(e).

20% of the floor space of the room of which at least 50 per cent shall haveopenings so as to allow free uninterrupted passage of air, if such room is used for the dissemination of knowledge in school;

(f).

20% of the floor space of the room of which 100% shall have openings so as to allow free uninterrupted passage of air, if such room is used for the accommodation of patients in a hospital, convalescence home, nursing home or the like;

Staircase, corridors and lobby

(g)

10% of the floor area per floor in the case of an enclosed staircase, corridor or lobby of which 50 per cent shall have openings so as to allow a free uninterrupted passage of air except as required under the provisions of the Code of Fire Precautions for Buildings.

Parking

(h)

10% of the floor space of the room of which at least 50% shall have openings so as to allow free uninterrupted passage of air

Factories, warehouses and godowns

(i)

10% of the floor space of the room of which atleast 50 per cent shall have openings so as to allow free uninterrupted passage of air, if such room is used as a godown or any other storage area.

Terrace Houses

55.

In addition to the requirements of paragraph (a) of regulation 57 there shall also be provided in the case of terrace houses of a depth greater than 12 m. permanent ventilation from front to rear by suitable vents in all front, back and cross walls at each floor. Such vents shall have a net opening area of not less than 0.4 square meters.

Adjoining rooms

56.

For the purpose of determining light and ventilation requirements, any room may be considered as a portion of an adjoining room when half of the area of the common wall is open and unobstructed

Natural light and ventilation for basement rooms

57.

When any room is located in a basement and is to be naturally lighted and ventilated, such room shall have atleast one third of the height of its external walls and all its required sources of natural light and ventilating above the outside ground level.