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HVAC hard-pipe duct with "mechanical" dampers


Nolan Kienitz
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1958 house, slab foundation, "hard pipe" HVAC ducts in slab with floor vents. (Mind you this is Texas ... NOT typical).

Mechanical damper control in each floor vent with felt sealer to close off when there is no air movement from system.

Anyone have any history?

MechDamper.jpg

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