name two methods of two ventilation.
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There are three ways of removing dust and impurities from air in a building: (1) the natural method; (2) forced ventilation by means of fans, and (3) the exhaust method. Natural ventilation is produced through doors and windows.
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(1) the natural method; (2) forced ventilation by means of fans, and (3) the exhaust method. Natural ventilation is produced through doors
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