Robert, If there's a rule on this forum of not opening old threads, I apologize...My bad. I am a member of many forums, on various subjects ranging from auto racing to hunting, to fishing, to HVAC, to....... I've seen many people search up old threads and find answers to their questions without ever...

Round metal duct is the best way to go about this, like Robert said. And the stuff is not that expensive. Increasing to 10" duct will help the problem you're having. It might not completely fix it, but it will help get more air to the other trunk line. You could also overkill it on the duct siz...

Payne is good equipment. And yes, it is made by Carrier.

Jay

I think what he's saying is the cross-over duct is built into the metal duct work and connects the two main trunk lines, and they meet up when the two halves of the house are lined up. I've seen this design many times, and this problem many times. When they do it this way the connector duct is the s...

Another route you can goo is to reasearch the different grill manufacturers. They will usually offer grills with "apposed blade dampers" built onto them. These to not effect the diverter direction of airflow. But they do control the volume of air. We use the flat, round dampers like you de...