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

Residential Gallery
Spirovent® remains the world class standard that others attempt to reach. Often copied but never equaled.
University of Nebraska - Lincoln, NE
With close to one hundred Spirovents installed, The University of Nebraska at Lincoln is one of our largest higher-ed customers.
University of Missouri - Columbia, MO
The University of Missouri, Columbia is home to the second of the world's largest Spirovent® combination air eliminator and dirt separator.
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.