The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) has established a general guideline of 20 cubic feet of outside air per minute/per person for an office environment. This is a sufficient amount of air to dilute building contaminants and maintain a healthy environment. Indoor air quality complaints increase significantly in offices that are not supplied sufficient outside air: http://www.canadianblower.com/fans/index.html. Oleg Tchetchel Ventilation Expert Canada Blower http://www.canadianblower.com/blowers/index.html http://canadianblower.com/inquiry/index.html
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