Security Chimneys Secure Black 7DL18A Double Wall Adjustable Lengths d5.625 5 Weighted average LHV (Low

5 Weighted average LHV (Low Heating Value) & HHV (High Heating Value) efficiencies using data collected during EPA emissions test

Model 18CNHC1F5 Product Size 18" Vent Type Vented Fuel Type Natural Gas Certification ANSI Z

Wall Plate

Listings/Standards

superior quality

Security Chimneys Secure Black 7DL18A Double Wall Adjustable Lengths d5.625 5 Weighted average LHV (LowOverview Since starting operations in 1960, Security Chimneys International has built a reputation as one of the most trusted suppliers of quality chimneys in North America. Our dedication to total quality lives in the research and development of new products and services for the residential and commercial markets. With a 104,800 square foot manufacturing facility in Laval, Quebec, we are fully equipped and accredited to certify that all our products