Factory-Built, Residential Type and/or Building Heating Appliance Type Chimney — Type HT

A residential type and building heating appliance chimney suitable for use at 1000°F (538°C), which complies with the optional 10-minute 2100°F temperature test of UL 103, Factory-Built Chimneys for Residential Type and Building Heating Appliance. Such chimneys are labeled as Type HT and are required for certain solid fuel-fired applications.

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