Skip to main content
  • Feature Story

UL Approved for NOx Testing

March 27, 2017

Recently, UL was approved for NOx testing under the South Coast Air Quality Management District’s Laboratory Approval Program (SCAQMD LAP) for SCAQMD Rules 1111, 1121, and 1146.1 protocols for gas furnaces, water heaters, and boilers respectively. UL’s Toronto, Canada combustion lab is the primary facility for this testing.  For more information, please contact Peter Nguyen at