Equipment installed in and made a part of the vent, which will provide a positive induced draft is what?

• A. Mechanical draft blower
• B. Venturi aspirator
• C. Mechanical exhaust system
• D. Natural draft stack

Answer: (C)

In venting systems, moving combustion products out of the building is done either by natural forces or by a powered device. When you need to create induced draft, you rely on equipment that is installed in and becomes part of the vent itself. A mechanical exhaust system fits this requirement because it includes a fan or blower that actively pulls flue gases through the vent, producing the needed draft. This integrated, powered assembly is designed to create the induced draft reliably, regardless of natural buoyancy conditions.

The other options are not the same. A venturi aspirator is a passive device that uses flow to entrain air and is not a powered vent component. A natural draft stack relies on buoyancy with no moving parts. A mechanical draft blower can exist as part of a system, but the phrase “in and made a part of the vent” points to the complete ventilating assembly—the mechanical exhaust system—that provides the induced draft.