![]() Standards dealing with the design and operation of ventilation systems for the purpose of achieving acceptable indoor air quality include: ASHRAE Standards 62.1 and 62.2, the International Residential Code, the International Mechanical Code, and the United Kingdom Building Regulations Part F. However, the overall impacts of ventilation on indoor air quality can depend on more complex factors such as the sources of pollution, and the ways that activities and airflow interact to affect occupant exposure.Īn array of factors related to design and operation of ventilation systems are regulated by various codes and standards. The ability for a system to reduce pollution in a space is described as its "ventilation effectiveness". More generally, the way that an air distribution system causes ventilation to flow into and out of a space impacts the ability for a particular ventilation rate to remove internally generated pollutants. In kitchen ventilation systems, or for laboratory fume hoods, the design of effective effluent capture can be more important than the bulk amount of ventilation in a space. In scenarios where outdoor pollution would deteriorate indoor air quality, other treatment devices such as filtration may also be necessary. ![]() Although ventilation is an integral component to maintaining good indoor air quality, it may not be satisfactory alone. The design of buildings that promote occupant health and well being requires clear understanding of the ways that ventilation airflow interacts with, dilutes, displaces or introduces pollutants within the occupied space. When a building design relies on infiltration to maintain indoor air quality, this flow has been referred to as adventitious ventilation. Infiltration is the circumstantial flow of air from outdoors to indoors through leaks (unplanned openings) in a building envelope.Ventilation is typically described as separate from infiltration. In this case, mechanical systems may be used to supplement or regulate the naturally driven flow. Since natural ventilation flow depends on environmental conditions, it may not always provide an appropriate amount of ventilation. The mechanical and natural components may be used at the same time, or at different times of day, or in different seasons of the year. ![]()
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