Main prod. Group survey
deu
fra
esp
41
Environmental, waste disposal and recycling technology
Heat-economical installations
Heat recovery and transfer systems
2121.11
Evaporators
2121.17
Sampler coolers for superheated steam, boiler feedwater
2121.21
Ventilators with heat recovery
2121.27
Earth heat recovery plants
2121.31
Heat pumps
2121.33
Heat pump installations
2121.34
Heat pump controls
2121.96
Heat recovery units
2121.97
Heat transfer plants
