Gas-fired overhead luminous radiant heaters for non-domestic use. Safety and energy efficiency|Type testing, Luminescent devices, Classification systems, Safety measures, Design, Control devices, Packaging, Safety devices, Combustion, Air heaters, Testing conditions, Industrial, Test equipment, Marking, Heating equipment, Performance, Performance testing, Flueless heaters, Heaters, Temperature, Gas space heating, Leak tests, Gaseous fuels, Flues, Ignition, Burners, Instructions for use, Flames, Gas-powered devices, Test pressure, Stability, Radiant heaters, Forced-draught burners, Equipment safety, Overhead, Thermal measurement