The best place to put a booster is in the duct as close to the area (Room) that you want to increase airflow. This will pull the air through the ductwork, instead of having to push it all the way through it. Much more efficient way to do it. You will want to wire it into the system blower so that it cycles on and off with the blower, heat or cool. This can be accomplished using relays. Zone Heating and AC is a good option if you are doing it with new construction, but very costly in established homes. That is not to say it cannot be done, but it does require some extra planning, in that you must find the physical room for the equipment, Ductwork, Etc. You may want to consider a through the wall self-contained heating and AC unit for the 400 Sq. Ft. room. It would be much cheaper then installing a separate furnace and AC unit, Ductwork and nessesary wiring for it. Hope this helps... Visit any HVAC supply house and they will have what you need for the booster. Depending on the type, (round, square duct), current equipment, Etc. they can tell you what size you will need.
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