What is the Difference Between Stove Pipe and Chimney Pipe?

A stove pipe is a single-wall or double-wall pipe used inside the home to connect a wood stove to a chimney system. It is not designed to penetrate walls or roofs. A chimney pipe, also known as a class-A chimney pipe, is an insulated, double- or triple-wall pipe that vents smoke and gases safely outdoors. Unlike stove pipe, chimney pipe is rated for high temperatures and is required for passing through ceilings, walls, or roofs.

What is the 3/2/10 Rule for Stove Pipes?

The 3/2/10 rule for chimney installation states that:

1. The chimney must extend at least 3 feet above the highest point where it exits the roof.
2. The top of the chimney must be at least 2 feet higher than any part of the building within 10 feet horizontally.
3. This rule ensures proper draft and prevents downdrafts, improving the efficiency and safety of the stove.

What Are the Rules for a Wood Stove Chimney?

Key wood stove chimney regulations include:

• Use UL-listed Class A chimney pipe for venting.
• Maintain at least 2 inches of clearance from combustible materials.
• Follow the 3/2/10 rule for proper height and clearance.
• Avoid excessive horizontal runs to maintain strong draft.
• Regularly inspect and clean the chimney to prevent creosote buildup and fire hazards.

What is the Code for Wood Stove Pipe?

The National Fire Protection Association (NFPA) Code 211 and local building codes regulate wood stove pipe installation. General guidelines include:

• Single-wall stove pipe: Requires 18 inches of clearance from combustibles.
• Double-wall stove pipe: Requires 6 inches of clearance from combustibles.
• Must connect to a UL-listed chimney system and follow manufacturer specifications.

Does a Wood Stove Chimney Have to Go Above the Roof?

Yes, a wood stove chimney must extend above the roofline according to the 3/2/10 rule. This ensures proper airflow, prevents downdrafts, and meets fire safety codes. A chimney that is too short may lead to poor draft, increased smoke, and fire hazards.

How Far Can You Run Wood Stove Pipe Horizontally?

A wood stove pipe should not run horizontally for more than 3 feet. The shorter the horizontal section, the better the draft. If a horizontal run is necessary, it must be pitched upward at a minimum of 1/4 inch per foot toward the chimney to ensure proper smoke evacuation.

What is the Proper Way to Run a Stove Pipe?

The correct stove pipe installation follows these guidelines:

• Keep it as vertical as possible to improve draft.
• Use as few elbows as possible (preferably no more than two 90-degree elbows).
• Ensure tight-fitting, properly sealed connections to prevent smoke leaks.
• Secure the crimped end facing down into the stove collar to prevent creosote leaks.
• Maintain proper clearance from combustibles based on pipe type.

How Far Should a Chimney Extend Above the Roof Line?

A chimney must extend at least 3 feet above the roof and 2 feet higher than any structure within a 10-foot radius, following the 3/2/10 rule. This ensures proper airflow and prevents smoke from re-entering the home.

How Many Elbows Can You Have in a Wood Stove Pipe?

Ideally, a wood stove pipe should have no more than two 90-degree elbows to maintain strong draft and minimize creosote buildup. More elbows can reduce efficiency and increase the risk of smoke backup.

Does the Crimped End of a Stove Pipe Go Up or Down?

The crimped end of a stove pipe should always face down toward the stove. This prevents creosote and condensation from leaking at the joints, reducing the risk of leaks and potential fire hazards.

Do I Need a Flue Liner for a Stove Pipe?

A flue liner is required if you are connecting a wood stove to an existing masonry chimney. A stainless steel chimney liner improves draft efficiency, protects the chimney structure, and reduces creosote buildup. If using a class-A chimney system, the insulated pipe itself acts as the liner.