Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances. Gas fires, convector heaters, fire/back boilers and heating stoves (2nd and 3rd family gases)|Safety measures, Fuel-effect appliances, Maintenance, Gas-powered devices, Hot-water boilers, Ventilation, Combustion products, Convection heaters, Installation, 3rd family gases, Gas space heating, Exhaust gases, Flow measurement, 2nd family gases, Gas-fired heaters, Flues, Boilers, Flued heaters, Fire-tube boilers