Advanced Composite Lining for Safer, Stronger Chimneys
At United Chimney, we proudly offer in-house installation of FuranFlex® resin composite chimney liners, a cutting-edge solution for commercial buildings that demand durability, efficiency, and long-term protection. We’ve trusted FuranFlex® technology for years. As certified installers, we deliver these high-performance systems with even greater precision, quality, and control.
What Is FuranFlex®?
FuranFlex® is a revolutionary, joint-free composite chimney liner system designed to withstand extreme heat, resist corrosion, and adapt to virtually any flue shape or length. It installs quickly with minimal disruption and hardens to the strength of steel without adding unnecessary weight or reducing flue capacity.
Unlike traditional steel liners, FuranFlex® won’t corrode, making it ideal for today’s high-efficiency gas and oil heating systems, which produce acidic condensate that eats away at metal over time.
Why Commercial Chimneys Need FuranFlex®
Many of today’s boiler systems, especially high-efficiency or dual-fuel units, generate acidic condensation that can degrade clay liners and even stainless steel over time. This corrosion not only compromises system performance, it can also lead to dangerous gas leaks, DOB violations, or premature system failure.
FuranFlex® solves this by forming a sealed, corrosion-proof interior that conforms to your existing flue. It’s the ideal choice for:
- Boiler venting systems
- Gas and oil heating appliances
- Exhaust ducts in Pre-War and landmark buildings
- Hard-to-access or irregularly shaped chimneys
Key Advantages of FuranFlex® Liners
- No demolition required – Installs without removing walls or brickwork
- Joint-free installation – Seamless liner reduces risk of gas leaks
- Corrosion-resistant – Backed by a 25-year corrosion warranty
- Steel strength, minimal weight – Reinforced composite is lighter than metal
- Fits any flue shape – Round, square, oval, or variable cross-sections
- Quick turnaround – Most installations completed in a single day
- Smooth interior – Improves draft and efficiency
Our Installation Process
As certified FuranFlex® installers, United Chimney handles the entire process start to finish:
- Inspection & Assessment – We scan your flue and determine the optimal liner size and placement
- Liner Placement – The soft FuranFlex® tube is inserted into the flue
- Steam Expansion – Using controlled steam pressure, the liner inflates and molds to the chimney’s exact shape
- Curing – The liner hardens into a rigid, airtight composite shell
- Final Testing – We perform a video scan and pressure test to verify integrity and performance
Ideal for Pre-War and Multi-Story Buildings
In New York City and other dense urban environments, many flues are routed through Pre-War buildings with unique challenges: aging masonry, tight access, and shared venting systems. FuranFlex® excels in these environments because it can be installed without demolition, conforms to irregular paths, and provides gas-tight performance even in tall or unusually shaped chimneys.
Why Choose United Chimney?
With over 30 years of commercial chimney expertise, United Chimney is the trusted name in turnkey venting solutions. Our certified team is trained in the latest FuranFlex® installation techniques and equipped to handle complex venting projects in high-rise, mixed-use, and legacy buildings across the tri-state area.
Whether you’re upgrading your boiler system, replacing a failing flue, or resolving corrosion concerns, FuranFlex® offers a future-proof solution and United Chimney delivers it with unmatched precision.
Ready to Upgrade Your Chimney Liner?
Let’s talk about how FuranFlex® can improve the performance and safety of your building’s venting system. Schedule an inspection today and discover the smarter way to line your chimney.
