1) Air and tear enders 2) Air carriers 3) Air conduits 4) Air passages 5) Air passages, at times 6) Air-conditioning passageways 7) Body tubes 8) Channels 9) Conveyors of a sort 10) Heat carriers 11) Heat pipes 12) Heating conduits 13) Heating pipes 14) Heating system network 15) Passages 16) Pipes Found on https://www.crosswordclues.com/clue/ducts
- The heating system. Usually round or rectangular metal pipes installed for distributing warm (or cold) air from the furnace to rooms in the home. Also a tunnel made of galvanized metal or rigid fiberglass, which carries air from the heater or ventilation opening to the rooms in a building. Found on http://www.homebuildingmanual.com/Glossary.htm
The heating system. Usually round or rectangular metal pipes installed for distributing warm (or cold) air from the furnace to rooms in the home. Also a tunnel made of galvanized metal or rigid fiberglass, which carries air from the heater or ventilation opening to the rooms in a building. Found on https://www.homebuildingmanual.com/Glossary.htm