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Air pressure

Posted by Harold Kestenholz - Hydronic Network on February 19th, 2001 05:56 PM
In reply to But You Said ... by Jay J -Moderator on February 19th, 2001 02:35 PM [Go to top of thread]

Right, aside from the semantics, any machine that forces air out one location (with its human-produced moisture) must make up air from some other location - in the winter, the dry outdoor air is the replacement. Warm water systems don't set up pressure differentials or leak air from duct gaps. Forced air central return systems have been measured showing a greater than 100% air change increase - hence reducing moisture in the home by diluting the remaining air that is left after forcing moister air out in another area. An increase in winter air changes results in a reduction of relative humidity.

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