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is it the same with either one of the other zones calling at the same time as the wireless?
Ok, and just to confirm...we dont think it is because the zone is smaller and when it is the only one open the blower seems faster because of much smaller amount of duct? In other words if blower is running same speed but most of the ductwork is closed...it is not just the force of the blower blowing through limited duct?
Do you have an 80% with variable speed blower? or the model number and I can tell.