M&G DuraVent has developed the industry’s first UL-listed relining system for factory-built chimneys for use in the United States. To date, there has never been a UL-approved product standard for such installations. All M&G DuraVent UL1777- listed relining systems combined with a patent-pending termination have been approved.

Safely relining factory-built chimney systems has been a longterm industry unknown. Many factory- built chimneys were designed and installed as a system with a solid-fuel–burning appliance, often a zero-clearance fireplace. This combined system was initially installed under its own UL safety standard, typically UL127. Installing a liner within an existing factory-built chimney (not covered by any safety standard) potentially creates a number of safety issues.

This can easily impair the safe operation of the existing chimney system. This mixing of systems and UL standards has been a problem, with a number of field failures. M&G DuraVent used its industry-leading test facilities and an innovative approach to test these installations systematically.

M&G DuraVent has engineered a solution that exceeds UL’s stringent safety requirements and can thus bear the UL mark. This advance will bring a new level of reliability to installations and will significantly improve safety.