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Category IV Flue

Want help with your boiler flue or engine exhaust design? Let us do the tedious part for you! Professional drawings and pressure calculations complete with a 20-year warranty!

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Heatfab® is the leading manufacturer of high quality venting systems for Special Gas Vent applications, specified by OEMs for over 20 years.


Saf-T Vent CI-Plus commercial/industrial double-wall AL29-4C vent is your answer to Category 4 venting applications up to 15" w.c. It is easy to install and the strong mechanical joint locks in place without RT. Tested and listed to UL 1738 and ULC-S636.


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Heat Technology Products