Best Class B Vent Pipe Options for Safe Home Venting

The best Class B vent pipe choices balance safety, durability, and ease of installation for residential and light commercial setups. This guide highlights five widely compatible options and explains who each is best for. Whether you’re replacing a vent, installing a new fireplace, or upgrading a gas appliance vent, these picks help you choose confidently. The top picks cover round rigid pipes, aluminum variants, and adjustable double-wall designs for flexible layouts.

Summary of chosen products:

  • DuraVent Type B 60 Inch Length Round Rigid Pipe – 7BV60
  • Simpson Dura-Vent 8GV36 Duravent 8″x36″ Type B Vent Pipe, Aluminum
  • Selkirk 4″ Diameter Adjustable Wall Thimble and Firestop – 187704
  • SELKIRK 104012 Type B Round Gas Vent Pipe, Aluminum Inner / Steel Outer
  • 4″ x 12″ Adjustable Length Type B Double Wall Round Gas Vent Pipe (4M12A)

DuraVent Type B 60 Inch Length Round Rigid Pipe


DuraVent Type B 60 Inch Length Round Rigid Pipe image

Best for: General residential venting where a rigid, 60-inch length is needed. This option provides sturdy, long runs suitable for longer vent paths and stable installation.

Simpson Dura-Vent 8GV36 Duravent 8″x36″


Simpson Dura-Vent 8GV36 image

Best for: Aluminum venting where lighter weight and easier handling are priorities. Good for shorter runs or where aluminum is preferred for corrosion resistance in dry environments.

Selkirk 4″ Wall Thimble and Firestop 187704


Selkirk 187704 wall thimble image

Check Price on Amazon

Key features include a versatile double-wall venting design, providing a 1-inch air space to combustibles when installed per specifications, and an aluminum liner with a galvanized exterior for durability. Best for: Residential or light commercial installations needing a combined vent, wall thimble, and firestop. Limitations: Requires exact air-space clearances to maintain safety standards.

SELKIRK 104012 Type B Round Pipe


Selkirk 4 inch Type B Round Pipe image

Check Price on Amazon

Best for: Systems needing an adjustable pipe connector to connect to the appliance outlet. The male end adapts to standard inlets for flexible installation. Caution: Follow local codes for length and layout to ensure proper venting distance and heat exposure protection.

4″ x 12″ Adjustable Length Type B Double Wall Pipe


4x12 Type B Double Wall Pipe image

Check Price on Amazon

Best for: Applications requiring adjustable lengths with a locking system for secure connections. Note: Overlaps add 1.5 inches when joined, so assembled length is slightly shorter. Choose this if you need a tight, twist-locked seal and variable run lengths.

Buying Guide

What should I consider when selecting a Class B vent pipe?

  • Material and durability: Aluminum vs. galvanized steel. Aluminum is lighter and resistant to weather in outdoor runs, while steel provides rugged protection for longer indoor sections.
  • Diameter and length: Ensure the pipe diameter matches the appliance outlet and vent-inlet requirements. Consider adjustable lengths to fit the space without excessive coupling joints.
  • Double-wall vs. single-wall: Double-wall designs offer better insulation and safety, but may be bulkier. Single-wall can be easier to maneuver in tight spaces.
  • Install clearance: Maintain required air space from combustibles and follow manufacturer guidelines for wall thimbles, firestops, and supports.
  • Ease of installation: Look for locking systems (like SureLock) and compatible end fittings to simplify assembly and reduce leakage risk.

How to compare these options quickly

  • Rigid round pipes (like the DuraVent 7BV60) are best for stable, straight runs with fewer joints.
  • Aluminum vents (Simpson 8GV36) offer lighter handling for shorter or moderately long runs.
  • Double-wall components with firestops (Selkirk 187704) provide enhanced safety in mixed indoor-outdoor paths.
  • Adjustable pipes (104012, 4M12A) help tailor length in tight spaces and reduce waste joints.

Installation tips

  • Verify compatibility with the appliance type and venting class required by your local codes.
  • Use proper sealing methods and gaskets at all joints to prevent leaking gases.
  • Position supports at manufacturer-recommended intervals to avoid sagging or misalignment.

FAQ

  1. What is Class B vent pipe best used for?

    Class B vent pipes are designed for venting certain gas appliances and fireplaces, providing safe, double-wall construction to reduce heat transmission and condensation.

  2. Can I mix aluminum and steel vent components?

    Mixed materials are generally not recommended unless specified by the manufacturer. Check compatibility and local codes before mixing components.

  3. Is a double-wall vent necessary for all installations?

    No. For some indoor, short, or low-heat runs, a single-wall vent may suffice. Double-wall is preferred for higher temperatures and external exposure.

  4. How do I determine the correct pipe diameter?

    Match the appliance outlet or the vent collar specified by the manufacturer. Diameter is critical for proper venting and safety.

  5. What is SureLock technology?

    SureLock refers to a locking mechanism that creates a secure twist-lock connection, reducing the risk of unscrewing joints under pressure or heat.

Similar Posts