How frequently must combustion air and vent pipes be supported when installing a direct vent high-efficiency condensing furnace?

In the installation of direct vent high-efficiency condensing furnaces, it's essential to maintain the structural integrity and functionality of combustion air and vent pipes. Supporting these pipes at the appropriate intervals prevents sagging, potential leakage, and ensures proper alignment with the furnace. The correct interval for supporting combustion air and vent pipes is every 5 feet. This recommendation aligns with industry standards for maintaining safe and effective venting systems.

Supporting the pipes at this interval enables them to adequately handle various stresses such as thermal expansion and contraction, as well as potential external forces from wind or other environmental factors. When properly supported, the risk of misalignment or mechanical failure is significantly reduced, promoting the long-term efficiency and safety of the heating system.