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Gas-powered devices|Heaters|Instructions for use|Heat|Commercial|Fire safety|Gas space heating|Classification systems|Combustion|Safety valves|Marking|Flames|Flow rates|Performance testing|Gas valves|Convection heaters|Temperature control|Leak tests|Flues|Heat exchangers|Abrasion|Design|Performance|Ignition systems (heat engineering)|Artificial weathering tests|Testing conditions|Flued heaters|Air|Air heaters|Automatic control systems|Warm-air heating|Test equipment|Weather resistance|Thermal efficiency|2nd family gases|Gas flow|Flow measurement|Burners|Industrial|Combustion products|Safety measures