Ducts must be properly sealed and what else?

Ducts must be properly sealed and what else?

• A. Lined
• B. Vented
• C. Sealed
• D. Insulated

Answer: (D)

Keeping ductwork sealed and insulated is essential for efficient heating and cooling. Sealing prevents air leaks at joints and connections, so the conditioned air actually reaches the rooms instead of escaping into walls or attic spaces. Insulation reduces heat transfer between the air inside the ducts and the surrounding environment, helping the air stay at its intended temperature as it travels, which improves comfort and lowers energy use. It also prevents condensation on cold ducts in humid spaces, avoiding moisture problems. Lining isn’t required everywhere and doesn’t address energy loss the way insulation does, and venting isn’t part of standard duct construction. Sealing alone won’t control heat transfer without insulation, so the best pairing is sealed and insulated.

Keeping ductwork sealed and insulated is essential for efficient heating and cooling. Sealing prevents air leaks at joints and connections, so the conditioned air actually reaches the rooms instead of escaping into walls or attic spaces. Insulation reduces heat transfer between the air inside the ducts and the surrounding environment, helping the air stay at its intended temperature as it travels, which improves comfort and lowers energy use. It also prevents condensation on cold ducts in humid spaces, avoiding moisture problems. Lining isn’t required everywhere and doesn’t address energy loss the way insulation does, and venting isn’t part of standard duct construction. Sealing alone won’t control heat transfer without insulation, so the best pairing is sealed and insulated.