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

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.
North Mississippi Medical Center - Tupelo, MS
High velocity 18" combination air eliminator and dirt separator.
IM Flash Technologies - Lehi, UT
Custom 14" all stainless steel high velocity air eliminator for process chilled water.
Kansas State University - Manhattan, KS
Following the installation of numerous smaller units on campus that met all expectations, a separator upgrade was proposed for the central plant.