What is an example of a direct vent gas appliance?

A direct vent gas appliance is specifically designed to draw air for combustion directly from the outdoors and exhaust the combustion gases back outside through a sealed venting system. The direct vent furnace operates using this method, providing enhanced safety and efficiency because it minimizes the risk of backdrafts and ensures that fresh outdoor air is used for combustion.

In comparison, the conventional furnace generally relies on indoor air for combustion and may have different venting requirements, thus not fitting the definition of a direct vent appliance. Similarly, a standard water heater may vent gases using traditional methods that do not meet the criteria of being sealed or drawing outdoor air. A portable gas heater is designed for flexibility and mobility, often lacking a dedicated venting system and typically relying on the surrounding indoor air for combustion. This makes the direct vent furnace the most appropriate example of the specified type of appliance.