Our new Fire-Resistant floor boxes expand the versatility of our floor box line by providing enhanced, fire-resistant versions of our existing products. All of our Fire-Resistant Products are UL Listed and complies with UL 263 Fire Resistance Ratngs and UL 514 Scrub water requirements. The FRK fire- resistant system is offered in two sizes: the FL-FRK-500P and FL-FRK-605P. Other depths are available consult an FSR sales associate. Both models include a UL listed 3-hour Fire-Resistant Floor box system comprised of a FireStop box, and four FL-FRK 1 1/2" Intumescent-lined Conduit Assemblies, hardware and installation instructions.