I've got a two zone Carrier system. The ducting is in the attic and there are only two motorized dampers that feed each zone. There are several rooms that could use a bit more air. I have a walk-in closet, a utility room and a laundry room which since they are small get a lot more airflow than is needed. I want to close those registers to redistribute air.
My question is more of a theoretical one. The main trunks run through the attic with the octopus arms branching out to the individual registers. If I close a register, the air will still travel out the octopus arm where it will stop at the closed register. How will that air benefit the remaining registers that are open?