Class A Chimney Pipe

Class A chimney pipe is insulated, double- or triple-wall pipe rated for safe clearance through walls, ceilings, and roofs. Shop Class A pipe and support components sized for your venting system below.

Class A Chimney Pipe

Class A chimney pipe is a factory-built, insulated pipe system designed to safely vent wood-burning stoves, fireplace inserts, and other solid-fuel appliances through combustible walls, ceilings, and roofs. Unlike single-wall stovepipe, which is only rated for use within the room where the appliance sits, Class A pipe's insulated construction keeps outer wall temperatures low enough to pass safely through framing and roofing materials.

Why Class A Pipe Matters

  • Code-required for penetrations — most building codes require Class A pipe anywhere your venting passes through a wall, ceiling, or roof.
  • Insulated for safety — the air gap or insulation between the inner and outer walls keeps exterior surface temperatures low.
  • Built for high heat — rated to handle the higher flue temperatures of wood-burning appliances.
  • Long-term durability — stainless steel construction stands up to years of heat cycling and weather exposure.

What to Consider When Buying Class A Pipe

  • Diameter — match the pipe diameter to your stove or insert's flue collar size.
  • Length & components — factor in straight lengths, elbows, and roof or wall supports for your full run.
  • Single-wall vs. Class A — single-wall pipe is only for the connector section inside the room; anything passing through a wall or ceiling needs Class A.
  • Brand-matched systems — stick with one manufacturer's Class A system from appliance to termination for certified, safe performance.

Frequently Asked Questions

  • What's the difference between single-wall stovepipe and Class A chimney pipe?

    Single-wall pipe connects your stove to the wall or ceiling thimble within the room and requires more clearance to combustibles. Class A pipe is insulated and rated to pass safely through walls, ceilings, and roofs.

  • Do I need Class A pipe for my entire chimney system, or just part of it?

    You typically need Class A pipe anywhere the venting passes through a combustible wall, ceiling, or roof, and often for any exterior sections as well — check your appliance manual and local code for specifics.

  • Can I mix Class A pipe from different manufacturers?

    We recommend using one manufacturer's Class A system throughout, since these systems are engineered and certified as a matched set.