Commercial Gas Vent Flue Fittings

These new-in-box, stainless steel commercial gas vent/flue fittings are designed for extreme resistance to chloride ion pitting, crevice corrosion and stress corrosion cracking, as well as general corrosion in oxidizing and moderately reducing environments. Ideal for withstanding harmful effects of corrosive condensates created by partially or fully condensing high-efficiency natural gas and propane-fired heating appliances. These Security Chimneys double wall Secure Seal items are available in 4" and 6" diameters in a variety of options. 

• Tube ends formed under stringent guidelines and held to exacting standards.
  
• Outer tube made of type 441 stainless steel for longevity and outdoor stability.
• 1" air space between flue and casing.
• Smooth, laser butt-welded seams inside and out.
  
• Double-wall system fully interchangeable with single-wall system.
• When installed properly, meets all test requirements for horizontal and vertical, interior or exterior installations. 
• For use with Categories I, II, III and IV gas-fired appliances, high-efficiency gas boilers, furnaces, booster heaters, pool heaters, water heaters, unit heaters or tankless water heaters.
• Type BH Gas Vent Systems for appliances having a rated operating flue temperature of 480°F. 
• Flex features smooth inner wall that provides for no output reduction, while supporting system’s overall strength. 
• Built-in draw latches provide quick and easy tool-free assembly and disassembly. 
• Standard adjustable vent length provides vertical or horizontal adjustment for easy system pitching. 
• 29-4C® stainless steel resists extreme corrosive environments found in condensing boilers.
• Super-ferritic stainless steel (Flex) protects against chloride ion pitting and corrosion.
• Viton-seals; more resistant than silicone against chemicals such as sulfuric acid often found in condensate. 
• Tested and listed to UL-1738 and ULC-S636
• 90% or more off MSRP.