Chimney Safety Institute of America (CSIA) Certification Practice Test

What is a "breech" synonymous with in chimney terminology?

1. Flue

2. Thimble

3. Cap

4. Insert

The correct answer is: Thimble

In chimney terminology, "breech" refers to the section of the chimney system that connects the appliance (like a stove or furnace) to the flue. The breech is specifically the horizontal or angled portion that facilitates the passage of combustion gases from the appliance to the flue. The term "thimble" is used to describe a fitting or part of a chimney that allows a pipe to pass through a wall or another structure, often connecting the appliance to the chimney. In this context, the breech can sometimes be closely associated with the thimble as both are components of the chimney system, but they serve distinct functions. It's important to note that a flue is the vertical passage through which smoke and gases exit, a cap is a cover at the top of a chimney to keep out water and debris, and an insert refers to a fireplace insert, which is an appliance designed to be installed into an existing fireplace. The specific connection of the appliance through the breech to overall chimney performance and safety makes understanding its terminology essential for chimney safety.