Ключевые слова:
Thermal efficiency|Automatic control systems|Flow measurement|Instructions for use|Flues|Burners|Heaters|Test equipment|Performance testing|Convection heaters|Temperature control|Gas space heating|Scratch tests|Combustion|Designations|Performance|2nd family gases|Combustion products|Flames|Weather resistance|Safety engineering|Warm-air heating|Heat exchangers|Abrasion|Business facilities|Artificial weathering tests|Design|Air heaters|Watertightness tests|Classification systems|Flow rates|Heat|Gas flow|Gas valves|Gas-powered devices|Air|Safety valves|Industrial facilities|Marking|Flued heaters|Ignition systems (heat engineering)