What is the minimum distance required between a forced-air inlet and a mechanical draft vent terminal?

What is the minimum distance required between a forced-air inlet and a mechanical draft vent terminal?

• A. 10 ft
• B. 3 ft
• C. 6 ft
• D. 15 ft

Answer: (A)

Keep combustion air intake and exhaust vent terminal far enough apart to prevent backdrafting and recirculation of flue gases into the air intake. For a forced-air appliance with a mechanical draft vent, the minimum separation is ten feet. This spacing helps ensure that any flue products leaving the vent don’t be drawn back into the combustion air intake, which could cause improper combustion and increase the risk of carbon monoxide. Measuring is from the outside face of the forced-air inlet to the outside face of the mechanical draft vent terminal.

Keep combustion air intake and exhaust vent terminal far enough apart to prevent backdrafting and recirculation of flue gases into the air intake. For a forced-air appliance with a mechanical draft vent, the minimum separation is ten feet. This spacing helps ensure that any flue products leaving the vent don’t be drawn back into the combustion air intake, which could cause improper combustion and increase the risk of carbon monoxide. Measuring is from the outside face of the forced-air inlet to the outside face of the mechanical draft vent terminal.