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

Penn State University - State College, PA
Penn State is one of our largest university customers with more than 90 units installed across campus.
University of Delaware - Newark, DE
Following an on-site system review, the first two Spirovents were installed in an equipment room serving two residence halls with recurring problems.
International ALERT Academy, Big Sandy, TX

“I have not had to vent a coil in the three months since

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.