gaine

CONT: Les gaines destinées aux installations de chauffage par air chaud peuvent être constituées par des matériaux métalliques ou non métalliques.
OBS: gaine : terme très fréquent dans les sources européennes, mais à déconseiller dans l'usage canadien, selon l'Ordre des architectes du Québec.

CONT: Duct. ... metal pipes ... round or rectangular in shape, for distributing warm air from the heating plant to the various rooms, or for conveying air from air-conditioning devices.
CONT: Forced air systems (heating) ... As the hot air is delivered through the ducts and into the room through the supply outlet, cooler air from the space (room) is being returned through return grilles, into ducts and back through the central heating unit to be heated and sent back to the space. The ducts may be circular or rectangular, and their size depends on the amount of heated air which must flow through them to maintain the desired temperature of the room.