G2 Gas Fitter Practice Exam 2025 - Free Gas Fitter Practice Questions and Study Guide

Increasing the height of the chimney is often an effective solution for correcting insufficient natural draft. When the chimney height is increased, it enhances the overall draft by creating a greater pressure difference between the inside and outside of the chimney due to the stack effect. This difference is essential for maintaining proper airflow, which allows combustion gases to be effectively vented from the appliance.

A taller chimney can help improve the draft, especially in situations where existing conditions may hinder it, such as nearby structures or trees that block wind flow or create turbulence around the chimney. The improved draft results in better combustion efficiency, reduces the risk of backdrafting, and helps maintain safe operation of gas appliances.

Reducing appliance load, decreasing chimney height, or installing a draft regulator may not effectively address the fundamental issue of insufficient draft compared to simply increasing chimney height, which directly impacts the necessary airflow and pressure dynamics needed for proper gas appliance function.