What is the common venting system for an induced draft non-condensing furnace?

The common venting system for an induced draft non-condensing furnace is categorized as Category 1. This classification is specifically for appliances that are designed to operate with a negative vent pressure, which is characteristic of induced draft furnaces. They are typically installed with venting systems that are intended for operation at atmospheric pressure and are suitable for flue gases with a flue gas temperature that is not significantly different from the ambient temperature.

Category 1 systems utilize a venting style that allows for the safe discharge of exhaust gases into the atmosphere without the need for specialized vent materials that can withstand high temperatures or acidic conditions. This makes them a compatible choice for non-condensing furnaces, which do not generate the same level of moisture in their exhaust as condensing appliances.

Understanding these distinctions is essential for ensuring the proper installation and functioning of the furnace while adhering to safety standards.