Prefabricated grease duct systems are tested and listed under the Underwriters Laboratories UL-1978 listing and the UL-2221 classification for zero clearance to combustibles. Proper design… Read More »

Chimney systems serving high efficiency hot water heaters and boilers fall under the scope of Underwriters Laboratories UL-1738 listing. Proper design of these systems presents… Read More »

Fire resistive ductwork systems are an important tool for the designer in many modern building applications. While the product is not new, there are often… Read More »