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The ducted system is very lilely marginal to Dometic Specifiations as it is sized for only one rooftop unit. If you investigated the fan specs for each unit they deliver about 300 cu feet/min each or 600 cubic feet per minute. If you measured the airflow out of each ceiling vent you should get close to the total of 600 cu feet per minute. You would need to rent a hood and meter to measure airflow. If the duct met specs for two units it should work fine. The pressurized duct should give equal flow to each ceiling register if they are all identical freespace per register.
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