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.