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Hows it going? I recently.installed two honeywell ARD dampers one is a 10" and the other 8" when i cut on the thermostats to open both dampers only one opens if i shut off the opened dampers thermostat it closes alowing the other to open. Any ideas on what could be causing this? Too much air flow? Both are 2 wire dampers.
 

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The ARDs normally come set up power closed, spring open. How do you have them wired.
 
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