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

Maine Medical Center - Augusta, ME
Three of the larger Spirotherm® products on this multi-system project.
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.
Commercial Gallery
Spirovent® is now the basis of design in many specifications by the top consulting engineering firms for new construction.
Healthcare Gallery
Spirovent® and Spirotrap® separators are installed in hundreds of hospital and medical centers throughout North America.