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Posted by HeatPro on April 01, 2008 at 08:44:11:
In Reply to: How would I purge air from hydroair system in attic? posted by Dave on April 01, 2008 at 06:58:05:
The procedures for setting pressure and purging air are here:
http://www.heatpro.us/purgeairtree/
When all else fails, having a valve to let air out at the highest point can help.