Neuman and Sandru (1990) emphasize the advantage of a manifolded exhaust system.
...a manifolded exhaust system offers the opportunity for energy recovery. Since all effluents are brought to a single exhaust system only one large recovery unit would be required and would operate at a higher efficiency than small individual recovery units. The recovery system or equipment should be chosen on the basis of temperature level. Practically all exhaust air recovery systems could be implemented such as run-around coils ... pipe heat exchangers etc. Care must be taken to prevent contaminant carryover between exhaust air and supply air streams.
