Which term describes equipment installed as part of the vent to provide a positive induced draft?

Which term describes equipment installed as part of the vent to provide a positive induced draft?

• A. Mechanical exhaust system
• B. Draft hood
• C. Venturi damper
• D. Regulator vent

Answer: (A)

Positive induced draft is created by a powered device that actively pulls combustion gases through the vent and out of the building. The term that describes equipment installed as part of the vent to provide that induced draft is a mechanical exhaust system. This typically means an induced-draft fan or blower built into the vent to ensure a steady flow of flue gases, improving venting performance and preventing backdrafts. Draft hood, by contrast, is a passive component at the appliance outlet that helps relieve pressure variations and does not actively pull gases. A venturi damper is a passive device that can influence draft through airflow dynamics but is not a powered mechanism that provides positive induced draft. The regulator vent is simply the vent used for the gas pressure regulator and is not part of venting combustion products.

Positive induced draft is created by a powered device that actively pulls combustion gases through the vent and out of the building. The term that describes equipment installed as part of the vent to provide that induced draft is a mechanical exhaust system. This typically means an induced-draft fan or blower built into the vent to ensure a steady flow of flue gases, improving venting performance and preventing backdrafts.

Draft hood, by contrast, is a passive component at the appliance outlet that helps relieve pressure variations and does not actively pull gases. A venturi damper is a passive device that can influence draft through airflow dynamics but is not a powered mechanism that provides positive induced draft. The regulator vent is simply the vent used for the gas pressure regulator and is not part of venting combustion products.