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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site vent damper A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system. Related category    • VENTILATION TOPICS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP