2010 ASHRAE Ventilation Standard Brings Breath of Fresh Air to Industry
Greenbuildingpro.com (06/15/2010)

ANSI/ASHRAE Standard 62.1-2010, Ventilation for Acceptable Indoor Air Quality, modifies the Natural Ventilation Rate Procedure so that buildings that meet the natural ventilation requirements also need to have a mechanical ventilation system to meet the Ventilation Rate or IAQ procedures, which should be employed when extreme outdoor temperatures, noise, and security concerns cause windows to be closed. According to Roger Hedrick, chair of the committee that worked on the standard, "Most buildings using natural ventilation in the United States are high-rise residential buildings that often have no form of outdoor air intake other than operable windows. This results in buildings with inadequate ventilation, because occupants often leave the windows closed in order to run the air conditioning, keep out noise, etc. The committee felt it needed to strengthen the existing prescriptive requirements to ensure adequate ventilation and their corresponding IAQ benefits are available to occupants." The standard also moves exhaust system requirements to a new section and indicates that all buildings must abide by the exhaust requirements -- regardless of the method employed to calculate outdoor air intake flow rates -- among other things.
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