Quality and Dependability
The Secure Seal flue is manufactured from AL29-4C, a super-ferritic stainless steel 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. AL29-4C is the ideal choice for withstanding the harmful effects of corrosive condensates created by partially or fully condensing high-efficiency natural gas and propane-fired heating appliances.
The Canadian Gas Research Institute found that test results proved AL29-4C to be one of the two “most corrosion-resistant alloys of 20 candidate stainless steels evaluated for resistance to chloride-induced corrosion in condensing and partially condensing gas-fired appliances.”
Stringent Standards for Quality Assurance
To guarantee a perfect fit every time and to avoid built-in stress points or weak areas, tube ends are formed under stringent guidelines and held to exacting standards.
The casing (outer tube on Secure Seal SSD/SSID) is manufactured from type 441 stainless steel to provide long-lasting performance and stability when exposed to the outdoors.
The air space between the flue and casing is 1″ on SSD and 2″ insulated on SSID, providing close clearances to combustibles, reasonable outside dimensions and an additional heat shield or margin of safety where needed.
Built to Last
Secure Seal features a smooth weld seam inside and out, which is completely shielded during the welding process. Contamination or molecular changes in the weld seam are avoided and no fillers are used in the welding process.
The Secure Seal double-wall system is fully interchangeable with our Secure Seal single-wall system. Both have been conformed to UL1738 and certified to ULC-S636 safety standards. When installed according to Security Chimneys’installation instructions, Secure Seal meets all test requirements for horizontal and vertical, interior or exterior installations. SSID features the same construction as SSD, but with 2″ air space filled with mineral wool insulation.
- Secure Seal® LDCS/LDCD (26″-36″ dia.)
- 3” Diameter Secure Seal