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Interesting HVAC return system

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This house has an interesting return for the HVAC system. It is a 1950s house on a slab. A concrete tunnel runs beneath the floor down the middle of the house. The wood floor above the slab has been furred up to allow air to flow beneath it. The returns are slits cut in the baseboard.

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There was a fairly large 18" x 20"ish register in the floor at the hallway outside the bedrooms so supply air volume would be OK. No musty smell. There was water pipe in the HVAC chase with insulation that was deteriorated. It might be an IAQ problem.

This was a few blocks from my home, Evergreen Pk., IL, "Home of the Unabomber."

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