It is possible to tap into ductwork and just ducttape a piece of 6'' or 8'' duct from a good spot and just double up your blankets and seal it as best as possible without causing a fire hazard. but, someone at home will need to be monitoring, alot. Due to the thermostat being (guessing) the first floor hallway...and I promise the thermo doesn't give a shit if there is a 400watt hid pushing out 160+ degrees in the attic. =)

another thing, I would advise more input from fellow canna.commers on you interfering with your airflow by cutting holes in it. I don't wanna be held responsible for you having to turn your computer room into a sauna during the summer because of a hacked up duct. :jointsmile: Hope I helped a little by rambling.

beSafe