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Image:

Wrong: This return air plenum is not lined and air sealed

Wrong: This return air plenum is not lined and air sealed
Image:

Wrong: This wall cavity is open to the attic allowing unconditioned, attic air to enter the HVAC system, bypassing the filter, and degrading system life and performance

Wrong: This wall cavity is open to the attic allowing unconditioned, attic air to enter the HVAC system, bypassing the filter, and degrading system life and performance
Video:

Your Northern Home: Walls