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
Silence is Golden (Yellow) for Berners-Schober
“The pumps are much quieter as is the circulating water
Eastern Illinois University - Charleston, IL
After having tried numerous other methods, the first Spirovent was installed in Carman Hall to deal with a long history of no heat calls and clogging valves.
IM Flash Technologies - Lehi, UT
Custom 14" all stainless steel high velocity air eliminator for process chilled water.