
Flexmaster is North America’s leading independent manufacturer of specialty boiler venting systems for over 35 years. The company has earned a reputation for providing innovative and high quality products for industrial and commercial venting and duct systems. Attributing their success to a corporate philosophy of creating value for customers with innovative products and services that exceed customer expectations and requirements.
- AL29-4C advanced stainless steel for unmatched corrosion resistance
- Patented double fail safe self-sealing gasket system
- cUL tested and listed
- Sizes from 3” – 24”, single and double wall
- For Category II, III, and IV heating equipment
- Patented airtight, stainless steel 316ti construction Chimney Liners
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Z-DENS Polypropylene vent systems made for High Efficiency Condensing boilers.
- Environmentally friendly - non-toxic
- Tested and listed to ULC S636
- Available in 2”, 3”, 4”, 5”, 6” and 8” diameter
- Higher temperature limit and range makes it a safer vent material.
- Self-Sealing design does not require any curing time
- Z-DENS can be completely recycled
Download Brochures

Z-DENS Polypropylene vent systems made for High Efficiency Condensing boilers.
- Environmentally friendly - non-toxic
- Tested and listed to ULC S636
- Available in 2”, 3”, 4”, 5”, 6” and 8” diameter
- Higher temperature limit and range makes it a safer vent material.
- Self-Sealing design does not require any curing time
- Z-DENS can be completely recycled
Download Brochures
OUR BOILER SPECIALISTS CAN HELP!
OUR BOILER SPECIALISTS CAN HELP!