What type of venting is typically allowed for direct vent high-efficiency condensing furnaces?

Direct vent high-efficiency condensing furnaces are designed to vent combustion gases directly outside while drawing in atmospheric air for combustion. The flexibility in venting options—both vertical and horizontal—is a key feature that enhances their installation versatility.

For vertical venting, the furnace can utilize a vertical termination at the roof, which is often preferred in buildings where the design allows for it, and it helps in ensuring the exhaust is released above the structure. Horizontal venting is beneficial in applications where the indoor layout limits vertical arrangements, allowing exhaust gases to be vented out directly through an exterior wall.

The ability to accommodate both types of venting means that these furnaces can be installed in various locations, adhering to the specific building configurations and local installation codes, thus catering to the diverse needs of different structures. This design consideration is important for optimizing the performance and safety of the system.

Venting options such as underground are not applicable for these systems due to safety and functional concerns related to blocked vents and the potential for harmful gas accumulation.