Install the Spirovent® at the point of lowest solubility, which is the place in the system where the temperature is the highest and pressure the lowest. Note as well to always "pump away" from the expansion tank, never towards it.

Related Work

North Mississippi Medical Center - Tupelo, MS
High velocity 18" combination air eliminator and dirt separator.
Unocal - Pacific Northwest, US
4" Spirovent® air eliminator being used to control foam in a bottling operation for transmission fluid and motor oil.
Purdue University - West Lafayette, IN
Spirovent exceeds expectations and leads the University to purchase and install (32) additional units at the village.
University of Michigan - Ann Arbor, MI
Replacing the old style centrifugal separator after two years of unsatisfactory system performance, the Spirovent solved the problems within two months.