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Very high efficiency DOAS equipment & design best practices

Published 3/25/20
Updated 4/02/25
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System requirements and recommendations to maximize system efficiency

These system requirements, recommendations, and compliant systems are intended to provide guidance to manufacturers, designers, and specifiers regarding the components and design principles of very high efficiency dedicated outside air systems (or very high efficiency DOAS). Developed over several years of research, market analysis, and demonstration project installations, these system requirements have been refined to decrease energy consumption, improve indoor-air quality, and improve occupant comfort over conventional systems.

View compliant systems

Download a list of all heat and energy recovery ventilation systems with ≥82% sensible effectiveness that comply with the very high efficiency DOAS approach.