What is the maximum distance between a return air and appliance vent outlet according to the fuel gas code?

The maximum distance between a return air and appliance vent outlet is specified in the fuel gas code to ensure proper airflow and venting efficiency. A distance of 10 feet is set as the standard because it helps prevent any potential interference between the return air stream and the venting system of combustion appliances. This distance minimizes the risk of negatively affecting the combustion process, which could lead to improper venting or, in worst-case scenarios, the backdraft of combustion gases into the building.

In residential and commercial installations, this guideline is crucial for maintaining indoor air quality and ensuring the safety of occupants. Having the return air too close to the appliance vent outlet may allow exhaust gases to be drawn back into the living space, posing health risks. Thus, the 10-foot requirement serves as a protective measure in mechanical design principles.