Termination Cap or Chimney Cap:
The last piece of the top most part of a factory-built chimney pipe system, which serves the purpose of arresting sparks, keeping water out of the flue, and providing an outlet for cooling air on air-cooled chimney system.
Chase Cover (bottom pan):
A custom-made flashing that keeps water out of the chimney chase and home while providing an opening for the pipe termination.
A pathway for a manufactured chimney pipe to pass through. Chases are commonly built on the home to resemble a traditional chimney, to provide lateral support for the chimney pipe, and keep the cold weather from cooling the flue.
Firestop / Firestop Spacer:
A manufactured component of a factory-built chimney that separates the fireplace enclosure from the attic areas and still allows proper heat clearances to adjacent combustibles. This slows the spread of fire through a home in the instance of a house fire and is required by building code.
The structure that passes through the construction of the home and encloses the flue (or flues).
This is the firebox or place where you build the fire or place the gas logs.
The non-combustible floor area in front of the fireplace that is required for safety. NFPA code requires the outer hearth to extend 18″ from the fireplace opening.