A 6" duct was required for the 400 CFM ventilation fan built into the microwave. Successful installation of duct includes running pipe as straight as possible with minimal use of elbows, and pitched slightly down and out through the building. Air sealing with fire retardant spray foam helps to maintain a tight building envelope. The non-structural soffit was partially framed prior to the duct installation.
Under the Sun Building and Remodeling, LLC
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