Class A chimney pipe is the only type of chimney system rated to pass safely through ceilings, walls, and roofs. Every Class A system sold in the United States must be tested and listed to UL 103HT, meaning it can withstand continuous flue gas temperatures of 1000 degrees F and short-term exposure up to 2100 degrees F. NFPA 211 requires Class A pipe for all new wood-burning installations that vent through combustible construction. Below we compare four of the most widely available Class A chimney pipe brands in the U.S. so you can see how they stack up on materials, warranty, support, and price.
1. Ventis - Premium North American Quality
Ventis Class A systems are manufactured in Canada and the U.S. using 304L and 316L stainless steel inner liners. All Ventis products carry UL 103HT certification and come with a limited lifetime warranty. The build quality is strong, and Ventis has a solid reputation among chimney professionals.
The trade-off is price. Ventis systems tend to sit at the higher end of the market, which can push the total cost of a full chimney installation above what other certified systems cost. For homeowners on a budget, the premium may be hard to justify when other UL-listed systems offer the same certified safety rating.
2. DuraTech (DuraVent) - Proven and Widely Available
DuraVent's DuraTech line is one of the most widely distributed Class A systems in the country. It meets UL 103HT standards and is stocked by many local hearth dealers and online retailers. DuraTech is a reliable mid-range option with strong brand recognition.
One thing to note: some DuraTech models use a galvanized outer shell rather than full stainless steel. Galvanized steel can corrode faster in humid or coastal environments, which may affect the system's long-term durability compared to a full stainless construction.
3. Selkirk - Affordable and Easy to Find
Selkirk's SuperVent and SuperPro lines are budget-friendly and widely available at big-box retailers. They meet UL 103HT standards and are a common choice for homeowners looking for a lower upfront cost. Availability is a strong point - you can often pick up components the same day.
Selkirk systems tend to use thinner materials and may carry shorter warranty terms compared to premium brands. For homeowners planning to use their stove as a primary heat source over many years, it is worth comparing the warranty coverage and material specs carefully before choosing based on price alone.
4. Flue-Pipes.com - Direct From the Producer
Our own Class A stainless-steel chimney systems are manufactured from high-grade 304 type stainless steel, fully insulated with mineral wool, and tested to UL 103HT (2100 degrees F). By supplying directly from the producer - without distributors or retail mark-ups - we keep pricing as low as possible while maintaining professional-grade quality.
What sets Flue-Pipes.com apart is the combination of certified quality and hands-on support. Every customer gets access to real chimney specialists who can help with system selection, installation questions, and after-sales support. We also offer a 100% lowest price guarantee on equivalent UL-listed systems and a limited lifetime warranty.
- UL 103HT Listed - fully tested and certified for wood-burning appliances per NFPA 211
- Limited Lifetime Warranty - manufacturer-backed protection
- 100% Lowest Price Guarantee - we match any equivalent UL-listed system
- Expert Technical Support - real specialists available before, during, and after your purchase at 888-834-0880
- Next-Day Shipping - fast delivery across the continental U.S.
Side-by-Side Comparison of Class A Chimney Pipe Brands
| Brand | Main Material | UL 103HT Listed | Warranty | Sales Model | Technical Support | Lowest Price Guarantee | Typical Price Level |
|---|---|---|---|---|---|---|---|
| Flue-Pipes.com | 304 Type Stainless Steel | Yes | Limited Lifetime | Direct from producer | Direct support by chimney specialists (pre- and after-sales) | Yes, 100% | Lowest |
| Ventis | 304L / 316L Stainless Steel | Yes | Limited Lifetime | Dealer and distributor network | Via dealers and installers | No | High |
| DuraTech (DuraVent) | Stainless Inner / Galvanized or Stainless Outer | Yes | Limited Lifetime | Dealer and wholesale | Via dealers and documentation | No | Mid-range |
| Selkirk | Stainless Inner / Galvanized Outer | Yes | Varies by product line | Retail and big-box stores | Retail support and manuals | No | Budget |
Why Does Flue-Pipes.com Offer the Best Value?
All four brands in this comparison meet the same UL 103HT safety standard. The differences come down to materials, warranty, support, and pricing. Flue-Pipes.com is the only brand that combines full stainless steel construction, a limited lifetime warranty, direct-from-producer pricing, and dedicated technical support from real chimney specialists.
If you are installing a Class A insulated chimney pipe system, choosing a fully certified product is not optional - it is required by U.S. building codes and NFPA 211. The question is whether you want to pay a premium for a brand name, or get the same certified safety and performance at a lower price with better support.
Shop Complete Chimney Kits
Every kit includes the components you need for a safe, code-compliant installation. Choose the configuration that fits your project:
- Through-the-Roof Complete Chimney Kit
- Through-the-Wall Chimney Kit - Complete Package
- Garage Chimney Kit - Compact System
For a two-story home, read our guide to chimney installation in a 2-story house. If your chimney runs through an attic, check our through-the-attic installation guide. For cathedral ceiling situations, see how to install a chimney through a cathedral ceiling.
Frequently Asked Questions
What does UL 103HT mean for chimney pipes?
UL 103HT is a safety testing standard for factory-built chimneys. A chimney pipe that passes UL 103HT testing has been proven to handle continuous flue gas temperatures of 1000 degrees F and short bursts up to 2100 degrees F. This certification is required by NFPA 211 and most local building codes for wood-burning appliance installations. Learn more in our detailed explanation of UL 103 testing.
Can I mix Class A chimney pipe brands in one installation?
No. Mixing components from different manufacturers voids the UL listing and violates NFPA 211. Each brand's system is tested as a complete assembly, and the pieces are not designed to interconnect with other brands. Always use one brand throughout your entire chimney run.
What is the difference between Class A chimney pipe and stove pipe?
Stove pipe (also called connector pipe) is single-wall or double-wall black pipe used only in the same room as the stove. It connects the stove to the chimney system but cannot pass through any wall, ceiling, or roof. Class A chimney pipe is a fully insulated, UL-listed system designed to safely pass through combustible construction with a 2-inch clearance to combustibles. You need both: stove pipe in the room, and Class A from the ceiling or wall penetration to the top of the chimney. Browse our stove pipe and Class A chimney pipe categories.
How do I choose the right Class A chimney pipe diameter?
The chimney pipe diameter must match the flue collar on your stove. Most wood stoves use a 6-inch or 8-inch outlet. Never reduce the diameter below the stove manufacturer's specification - this restricts draft and creates a safety hazard. If you are unsure, use our free chimney design service and we will recommend the right size and components for your setup.
Need Expert Advice?
Our U.S. team provides free technical guidance for homeowners and installers. Whether you need help choosing the right chimney liner kit or planning a full chimney kit installation, we are here to help.
Call us at 888-834-0880 (9am-9pm, 7 days a week), email contact@flue-pipes.com, or use our free chimney design service for a custom recommendation within 24 hours.
Watch our Class A chimney pipe comparison video
