Chimney Pipe Differences
A proper chimney pipe is essential for safely venting smoke and gases from wood stoves, fireplaces, and other heating appliances. Whether you’re installing a new system or replacing an old chimney, understanding the different types of chimney pipes will help you choose the right one for your home.
Types of Chimney Pipes
There are two main types of chimney pipes: Class A Chimney Pipe and Stove Pipe. Each serves a specific purpose in venting solid-fuel appliances like wood stoves and fireplaces.
- Class A Chimney Pipe (Insulated)
Also known as double-wall or triple-wall chimney pipe, Class A chimney pipes are designed for high-temperature venting. These pipes:
Are used to vent wood stoves, fireplaces, and furnaces.
Feature insulated walls to keep outer surfaces cooler.
Are suitable for through-the-wall and through-the-roof installations.
Must be used when venting through combustible areas like walls or attics.
Best for: Homeowners needing a safe, durable chimney system for wood-burning appliances.
- Stove Pipe (Connector Pipe)
Stove pipes connect a wood stove to a Class A chimney pipe or existing masonry chimney. Unlike Class A chimney pipes, stove pipes:
Are designed only for indoor use (between the stove and the chimney system).
Come in single-wall or double-wall options.
Must not pass through walls, ceilings, or attics.
Best for: Indoor stove installations where the pipe connects directly to an existing venting system.
Choosing the Right Chimney Pipe
- Single-Wall vs. Double-Wall Stove Pipe
Single-Wall Pipe:
More affordable but requires at least 18 inches of clearance from combustibles.
Radiates more heat into the room.
Double-Wall Pipe:
Reduces clearance to 6 inches, making it safer for tight spaces.
Retains more heat inside the pipe for better efficiency.
- Chimney Pipe Diameter
Always match the chimney pipe diameter to your appliance's venting requirements. Common sizes include 6-inch and 8-inch diameters, but check your stove or fireplace manual for the correct fit.
- Chimney Pipe Length
Determine how much pipe you need based on your installation route. Standard sections come in 12-inch, 24-inch, 36-inch, and 48-inch lengths.
- Installation Route
Through-the-Roof Installation – The most direct venting method, requiring a roof flashing and storm collar for weather protection.
Through-the-Wall Installation – Requires an insulated thimble and tee support to safely transition outside.
Chimney Pipe Components You May Need
Depending on your setup, you may require additional parts for a safe and secure installation:
Elbows & Tees – For navigating obstacles or making turns in venting systems.
Wall Thimbles – Protects combustible walls when running a pipe through.
Roof Flashing & Storm Collars – Seals the roof penetration for waterproofing.
Chimney Caps – Prevents debris, animals, and moisture from entering your chimney.
Final Tips for Buying a Chimney Pipe
Always follow local building codes and manufacturer guidelines.
Choose the correct pipe type based on your appliance and installation needs.
Measure your pipe diameter to match your stove or fireplace.
Consider clearance requirements to ensure safe operation.
Need Expert Advice? Selecting the right chimney pipe can be confusing, but we’re here to help! Contact us today for personalized recommendations and expert support.