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.

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Maine Medical Center - Augusta, ME
Three of the larger Spirotherm® products on this multi-system project.
Residential Gallery
Spirovent® remains the world class standard that others attempt to reach. Often copied but never equaled.
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Spirovents have been installed in many new and existing industrial HVAC systems.
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“We couldn’t get the chilled water supply temperatu