Air cycle machine fan and compressor housing

An air cycle machine comprising:

• a first turbine section configured to expand air routed thereto;
• a second turbine section configured to expand air routed thereto;
• a fan and compressor section configured to draw in and compress air routed thereto and having a fan and compressor housing, the fan and compressor housing further comprising:
• a fan inlet disposed around a center axis of the housing and having a fan inlet mounting flange, the fan inlet mounting flange having a pinhole disposed thereon configured to receive a pin from a fan inlet diffuser housing and a fan inlet counterbore configured to receive a mating component from the fan inlet diffuser housing;
• a compressor outlet having a compressor outlet mounting flange, the compressor outlet mounting flange having a compressor outlet counterbore configured to receive a first mating component from a condenser/reheater;
• and
• a compressor inlet having a compressor inlet mounting flange, the compressor inlet mounting flange having a compressor inlet counterbore configured to receive a second mating component from the condenser/reheater.