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Right – Transfer grilles, Jump ducts, and wall grilles provide passive returns for air returning from bedrooms to the central HVAC system
Reference: Technical Guidance to the Indoor airPLUS Specifications
Author(s): U.S. Environmental Protection Agency
Organization(s): EPA

Website providing technical guidance to help home builders and their subcontractors, architects, and other housing professionals understand the intent and implementation of the specification requirements of the IAQ labeling program.

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The grille in the photo on the left brings air into a return air plenum under an air handler platform. As shown in the infrared image on the right, the plenum is not air sealed so hot attic air is being pulled into the air handler closet.
Reference: Field Evaluation of Efficient Building Technology with Photovoltaic Power Production in New Florida Residential Housing
Author(s): Parker
Organization(s): FESC

Report comparing a high-performance house with a code-built control home.

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