Safety of domestic gas appliances. Specification for combined appliances: fanned-circulation ducted-air heaters/circulators|Pilot flames, Gas space heating, Performance testing, Thermal testing, Domestic safety, Fan-assisted warm-air heating, Test equipment, Domestic, Type testing, Automatic control systems, Lint, Heating equipment, Heaters, Electrical safety, Temperature control, Ignition systems (heat engineering), Central heating, Leak tests, Safety measures, Performance, Circulators (heaters), Heat exchangers, Temperature rise, Water heaters, Combustion products, Maintenance, Testing conditions, Control devices, Fire safety, Fire tests, Instructions for use, Installation, Air heaters, Classification systems, Stability, Rated power, Flues, Ignition, Warm-air heating, Gas-powered devices, Marking