I recently removed the drywall ceiling from my basement and have two related questions about removing the HVAC ducts/pipes. Pictures attached here: http://imgur.com/a/qep4w
1. Is it OK to remove the insulation from the ducts? I believe that this was put in place so air con/heat didn't escape into the ceiling when the drywall was in place. Now that the ceiling space is part of the room, it doesn't seem to be a problem.
2. Is it alright to remove the vents and take the ducts all the way up to the main area? (Removing red X area, taking back to square red area). Same rationale - when the ceiling was in place, it couldn't vent into the ceiling space, but now there is no need to have it vent into the middle. Seems sound - just need to understand if there are air flow considerations/calculations that are needed.
Alternatively, removing the ducts all the way up until the edge of the room - I don't need it to vent into the center, from the side of the room would be fine now that the ceiling is open.