I am currently planning my HT and it will be in the basement of my new home the space is aproximately L21 X W14 H7'10"raw dimension. I have a HVAC duct that run through and terminates in the middle of that space. I belive (and this is whatI need advice on) that I can turn it 90 degrees and put it at the front of the theater and isolate it there. My question is how much will it affect the airflow to the ductwork it connects to and are there solutions if it does. I will be able to build a soffit around the duct work so it an auxilary fan is necessary I would be able to accomodate it. Thanks in advance to all of you HVAC guys I know you are out there.