What might be the result of an improperly sized lateral run in a venting system?

In the context of venting systems, an improperly sized lateral run can lead to pressurization issues. When the dimensions of the venting system are not correctly calibrated for the appliance's output, it affects the flow of combustion gases. If the lateral run is too small or improperly shaped, it can restrict the exhaust flow, causing buildup of gases and resulting in increased back pressure within the system.

This pressurization can lead to several operational problems, including potential back drafting, where combustion gases flow back into the living space rather than being properly vented outdoors. Additionally, the venting system may not draw in fresh air effectively, further complicating combustion processes and potentially leading to safety hazards. Proper sizing and installation of each component of a venting system are crucial for ensuring efficient operation, maintaining safety, and reducing risks associated with improper venting.