Q. What are the biggest duct system problems?
A. Good ducting must begin with a good room-by-room heat load calculation that will determine the right amount of heating, cooling and air that is right for each room. Next comes return and supply air placement and grill selection. Then an acceptable duct static pressure must be selected using the equipment manufacturers static pressure air flow information.
With this information, a proper duct system can be designed. Then the duct system must be installed as designed. The biggest problem with duct systems is that most duct systems are designed around the price of the system and not the requirements of the home or the comfort of the home owners.