Final answer:
Compressed air is supplied to the torch in a CAC-A torch through a canister or tank, which releases the air when the torch is in use.
Step-by-step explanation:
Compressed air is supplied to the torch in a CAC-A torch through a canister or tank. The compressed air is stored in the canister under high pressure. When the torch is in use, the compressed air is released from the canister and flows through a hose into the torch nozzle.