Answering the common buyer question: which Class B vent pipe best suits residential heating needs? This guide compares five practical options, highlighting who each product is best for, and why. It emphasizes durability, ease of installation, and suitability for gas appliances. Use this overview to narrow choices for venting gas fireplaces, furnaces, or water heaters. The buying table below helps you quickly compare core traits at a glance.
| Product | Best For | Key Benefit |
|---|---|---|
| DuraVent Type B 60 Inch Length Round Rigid Pipe – 7BV60 | Medium-to-long runs, rigid installations | Rigid, stable venting with fixed length |
| Simpson Dura-Vent 8GV36 Duravent 8″x36″ Type B Vent Pipe | Standard 8×36″ runs, aluminum construction | Lightweight aluminum with good outdoor resistance |
| Selkirk 4″ Diameter Adjustable Wall Thimble and Firestop | Wall penetration with fire protection | Firestop and air-space guidance for installs |
| SELKIRK 104012 Type B Round Gas Vent Pipe Aluminum Inner/Steel Outer | 4″ round venting with mixed metal design | Combination aluminum inner, steel outer for durability |
| 4″ x 12″ Adjustable Length Type B Double Wall Round Gas Vent Pipe UL Listed | Adjustable-length gas vent runs | SureLock system for easy, twist-lock assembly |
DuraVent Type B 60 Inch Length Round Rigid Pipe
Best for long, rigid vent runs where durability and fixed length matter. Suitable for straight runs from a gas appliance to a vent chase. Pros: stable, less flexible than corrugated options; Cons: less adaptable in tight spaces.
Simpson Dura-Vent 8GV36 Type B Vent Pipe
Best for standard 8×36″ runs where aluminum construction provides light weight and corrosion resistance. Choose this when you need easier handling without sacrificing Type B vent performance. Caution: ensure the exact size matches your appliance outlet and chase dimensions.
Selkirk Wall Thimble and Firestop, 4″
Best for installations requiring a wall penetration solution with fire protection. The thimble supports a proper 1-inch air space to combustibles when installed to specifications. It combines an aluminum liner for quick heat response with a galvanized exterior for outdoor durability. Consider this if your project prioritizes fire safety and clean wall routing. Limitation: compatibility with non-Selkirk components should be verified for your exact system.
SELKIRK 104012 Type B Round Gas Vent Pipe, 4″ x 12″
Best for 4″ round venting needs with a sturdy inner aluminum liner and outer steel construction. The adjustable connector helps align the vent with appliance outlets and standard inlets. It is a solid choice when you require a durable, mid-size vent path. Caution: verify that the chosen configuration remains within UL-listed guidelines for your appliance model.
4″ x 12″ Adjustable Length Type B Double Wall Round Gas Vent Pipe
Best for flexible layout needs where adjustable length is beneficial. The SureLock locking system provides a twist-lock connection to minimize leaks and simplify installation. Maximum temperature rating for Type B vent is indicated, and you should confirm the exact assembly length when joined, as overlaps can affect final length. Choose this if you want reliable, tool-friendly assembly in variable runs. Limitation: the overlap reduction should be factored into measurement plans.
Buying Guide: Key Purchase Considerations
- Ventage type and compatibility: Ensure the vent pipe matches your appliance’s Type B requirements and diameter.
- Material and weather exposure: Aluminum liners with galvanized exteriors resist corrosion and outdoor exposure well, but check local climate needs.
- Installation ease: Look for twist-lock or simple locking mechanisms to reduce installation time and error risk.
- Fire safety: Wall thimbles, firestops, and air-space considerations are essential for safe installations near combustibles.
- Length and adaptability: Fixed-length rigid pipes suit straight runs; adjustable-length options are better for complex layouts.
- UL and code compliance: Verify listings for gas-vent usage in your jurisdiction and with your appliance model.
Frequently Asked Questions
- What is Class B vent pipe used for?
Type B vent pipe is designed for venting gas appliances such as furnaces, water heaters, and fireplaces, using a double-wall system for safety and performance.
- What diameter should I choose?
Choose the diameter that matches your appliance outlet and the vent height. Common residential sizes include 4 inches.
- Are adjustable-length pipes better than fixed-length?
Adjustable-length pipes offer flexibility for irregular layouts, while fixed-length pipes provide simpler, rigid runs with less fitment risk.
- Do I need a wall thimble or firestop?
Yes, if the vent passes through walls or combustible materials. A wall thimble helps maintain air space and adds fire protection.
- How important is the locking system?
Locking systems (like SureLock) reduce the chance of accidental separation and improve performance in sealed installations.
- What should I verify before buying?
Check appliance compatibility, local code requirements, warranty considerations, and whether the vent is UL-listed for your specific use case.