The main duct that comes out of the plenum is rectangular. Air is directed up into the living area.
Smaller sections of pipe that carry air from the main duct to individual rooms.
The main duct that comes out of the plenum is round. Air is directed down into the living area.
Tool shaped like a pair of pliers, which is used to make corrugations in the end of a sheet metal duct to reduce its size.
Forced air system
A system of heating or air-conditioning in which the air is forced through a chamber connected to distributing ducts.
A large duct that comes directly out of the furnace or central air source or plenum. It is sometimes called a trunk duct.
HVAC system accumulation and distribution chamber for connection of ducts.
The central heating or cooling system contains a fan that gets its air supply through the return ducts. These ducts should ideally be installed in every room of the house.
A rectangular duct that is used between wall studs to vent supply and return duct runs.
The ductwork that carries air from the air handler to the rooms in the house.
Oval duct compared to round duct
Oval duct provides a more efficient alternative to rectangular duct in application where round can't be used. It is manufactured with the same techniques used to make round duct. As a result, oval duct shares many of the performance characteristics of round duct.