i built an insulated room in my garage in florida. my brother has fallen on hard times and he will be living in there very soon.
the ductboard box in the attic has no more room on the sides, to cut a new hole for a new drop.
my question is; can i cut a hole in the top of the ductboard box? then connect the duct to the new top hole and gradually bend it over to the new room's ceilng register, only about 6' away?
at home depot i've also seen inline duct booster fans. (a fan inside a short length of duct). it would hopefully pull enough air upwards from the plenum box and into his room to make it comfortable.
or should i use a larger duct? i was thinking 10" but maybe 12" because the garage gets hot. the soon to be conditioned space is about 160 sq ft. the central HVAC is 3 ton and freezes the house in a couple minutes, so it is easily enough to cool another room.
thank you for your knowledge and for taking time to reply to my question. it will help tremendously. kib49