Products regulated by mechanical codes

UL certification programs and services help code authorities and designers achieve safe, code compliant installations.

Boilers and water heaters

Electric, solid-fuel fired, gas-fired and oil-fired units. Learn more. 

Chimneys and vents

Includes factory-built chimneys, chimney liners, vents, connectors and related products. Learn more. 

Commercial Cooking

Products intended for use in commercial kitchens. Learn more.

Duct systems

Products used in air-conditioning, heating, and ventilating systems. Learn more.

Fireplaces and room heaters

Factory-built fireplaces, accessories and heaters. Learn more.

Other certifications 

Clothes dryer transition ducts Products certified to UL Subject 2158A Information Manufacturers