Ventilation is for:

(i) To provide oxygen.

(ii) To remove combustion gases, heat, dust, lint odors.

(iii) To remove contaminates such as smoke, shells, C02 etc.

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Ventilation means:

Free passage of clean air supply of outside air in to or the removal of inside air from an enclosed space. Types of Ventilation are –

I. General ventilation:

Removal of air from or the supply of air to the general area.

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II. Diluted Ventilation:

Supply of outside air to reduce the airborne con­tamination in the space.

Reasons for ventilation:

(a) If the room is not properly ventilated there will be excessive quantity of carbon dioxide in the air, difficulty in breathing. When the amount of carbon dioxide by volume is 6%, man losses consciousness when it reaches 10%, carbon dioxide should be 0.6%.

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(b) It is required to control dust & other impurities in the air.

(c) It is required to suppress body odours, smoke & concentration of bacte­ria.

(d) It is required to remove condensation.

(e) It is required to remove body heat generated by the occupants.

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(f) It is required to prevent suffocation.