of all kinds, solid fuel-burning appliances, chimney liners or repair treatments and record keeping equipment. Guardian tests to UL, ASTM, NFPA, CSA and ULC test standards for timed...Guardian Fire Testing Laboratories Inc. Guardian is a fire testing laboratory with services designed to meet your evaluation needs. We specialize in testing building products... Commission. Guardian can provide 3rd party factory inspection services. Guardian Fire Testing Laboratories, Inc. is accredited to ISO 17025 as a fire testing laboratory; ISO 17020...