Boiler & Water Heater Flue Systems
Factory-built chimney and venting for commercial boilers, water heaters, and condensing appliances, Category I–IV.
Overview
High-performance, prefabricated factory-built chimney and venting systems precision-engineered for commercial boilers, water heaters, and multi-appliance flues. Available in single-wall, double-wall air-insulated, and double-wall high-density fiber-insulated configurations optimized for both standard high-temperature and modern high-efficiency condensing applications. For retrofit projects, specialized Category III and IV rigid and flexible stainless-steel liners restore existing masonry or factory-built chimneys. Fully certified to UL 103 and UL 1738 across Category I, II, III, and IV draft environments. Every system is custom-configured to NFPA 54 and California Mechanical Code (CMC) based on field conditions, thermal draft calculations, and appliance manufacturer specifications.
Listings · UL 103 · UL 1738 · NFPA 54 · CMC
Specification Highlights
What this system delivers.
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Condensing-Ready Detailing
Liquid-tight joints, pitched horizontal runs, and drain tees route condensate safely to neutralizer kits.
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Category I–IV Coverage
Single-wall, air-insulated, and fiber-insulated profiles certified for every draft category.
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Retrofit Liners
Rigid and flexible stainless liners restore existing masonry and factory-built chimneys without demolition.
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Engineered to Local Code
Configured against NFPA 54, CMC, and appliance manufacturer draft requirements.
