Achieving good indoor air quality (IAQ) in nonresidential and low-rise residential buildings requires designers to understand and balance many HVAC system parameters. Following the ASHRAE standards that apply to ventilation, air movement, and exhausting of contaminants ensures that IAQ requirements will be met. A well-designed HVAC system must provide sufficient air flow, control moisture and contaminants in building assemblies and mechanical systems, limit contaminants from indoor and outdoor sources, meet system performance requirements, and minimize lifecycle costs.
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