The approvals arm of the commercial property insurer FM, and the source of the FM Approved listings named throughout this directory’s suppression and passive-protection files. Its testing is done at the 1,600-acre FM Research Campus in West Glocester, Rhode Island, whose 180,000 sq ft Fire Technology Laboratory is the largest facility of its type in the world: warehouse-scale fires are reproduced there to test automatic sprinklers, and full mock-ups are built for special-hazard extinguishing and water-mist systems, alongside laboratories for hazardous-location, gas-detection and fire-alarm equipment. Engineering and research sit at Norwood, Massachusetts. Insurer ownership is the point rather than a caveat — the approvals exist to reduce the insurer’s own losses — but a reader weighing an FM Approved listing should know it.