The ducts supplying the customers master bed room are 2 7" ducts tied into a 50' run of 12" explained to customer that over that lengthy of a duct run the air supplied will lose some velocity and gain a few degrees in temperature informed her the best solution would be to upsize the duct that feeds the two supplies in the master bedroom and to upsize them as well Customer did not want to do that at this time Also fully opened a halfway closed vent in master bedroom