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MBPE issues opinion: ERV intake/exhaust ducts may remain outside conditioned space; ducts and HVAC push equipment must be inside
Summary
The MBPE committee on July 18 adopted a staff opinion clarifying that ducts and HVAC “push” equipment must be located inside the conditioned space to receive R406 credits, but intake and exhaust ductwork for ERV/HRV systems need not be inside the conditioned space.
The MBPE committee on July 18 approved a staff opinion clarifying how ERV/HRV ductwork is treated under the residential energy code.
The committee's opinion says ducts and all HVAC “push” equipment must be located within the conditioned space to qualify for the R406 credit; however, the intake and exhaust duct runs that serve energy recovery ventilators (ERVs) and heat-recovery ventilators (HRVs) are not required to be inside the conditioned space. The committee voted to adopt the opinion and issue it to the City of West Richland, which had requested guidance.
Why it matters: The residential R406 credit is tied to placing distribution equipment where it is insulated and within the building’s thermal enclosure. Building officials, designers and contractors…
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