Knowledgebase: HVAC
I am confused about the differences between the different fan types. Can you explain?
Posted by - NA -, Last modified by Michael J. Witte on 28 November 2017 07:19 PM
In short:
Fan:ConstantVolume is a constant volume, continuous operation fan which can be turned on and off via a schedule.
Fan:OnOff is similar to the one above, but it cycles itself on and off as required by its thermostat ... all during the scheduled operation period. This is a typical mode of operation for a home furnace.
Fan:VariableVolume runs continuously during the Schedule period, but varies its volume to meet the heating or cooling demand.

Review the Input Output Reference (group Fans) for additional information.

Note: Thanks to J. V. Dirkes II for this article.
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