Direct vent refers to a sealed combustion system that draws outside air and exhausts gases directly through an exterior wall or roof.

Direct vent is a combustion system design used in heating appliances that draws combustion air from outside the building and exhausts flue gases directly outdoors through a sealed vent. This closed system separates the combustion process from indoor air, improving safety and energy efficiency.

In construction and mechanical systems, direct vent configurations are commonly used with gas fireplaces, furnaces, boilers, and water heaters. The venting system typically consists of a coaxial or dual-pipe arrangement—one pipe brings in fresh air while the other expels exhaust gases. This design allows flexible installation through walls or roofs without relying on traditional chimneys.

From a performance and safety perspective, direct vent systems reduce the risk of backdrafting, indoor air contamination, and energy loss. They are well-suited for tight building envelopes and modern energy-efficient construction, and must be installed in accordance with manufacturer requirements and mechanical codes.

Because direct vent systems are sealed, they can often be installed in bedrooms or tight indoor spaces where traditional vented appliances aren’t allowed.

• Gable Vent
• Intake Vent
• Ridge Vent