Which duct component is responsible for distributing supply air to different sections of a building?

Which duct component is responsible for distributing supply air to different sections of a building?

• A. Return air grille
• B. Air handler
• C. Supply plenum
• D. Chimney

Answer: (C)

Distributing conditioned air to different parts of a building relies on a central point in the duct system that feeds the various branches. The supply plenum serves as this main distribution chamber, receiving air from the air handler and then delivering it into the network of supply ducts that run to different rooms or zones. Because the plenum provides a common starting point and pressure for all the branches, it enables even delivery of air throughout the building. The air handler is the unit that conditions and moves the air into the system, but the actual distribution to multiple sections happens via the supply plenum feeding the branch ducts. Return air grilles pull air back for reconditioning, and chimneys aren’t part of this distribution function.

Distributing conditioned air to different parts of a building relies on a central point in the duct system that feeds the various branches. The supply plenum serves as this main distribution chamber, receiving air from the air handler and then delivering it into the network of supply ducts that run to different rooms or zones. Because the plenum provides a common starting point and pressure for all the branches, it enables even delivery of air throughout the building. The air handler is the unit that conditions and moves the air into the system, but the actual distribution to multiple sections happens via the supply plenum feeding the branch ducts. Return air grilles pull air back for reconditioning, and chimneys aren’t part of this distribution function.