How to drywall wall with HVAC trunk and pipe penetrations
I am building a wall separating a utility room from the remainder of the basement. An HVAC trunk, gas pipe and two PVC pipes from the furnace in the utility room penetrate the new wall, entering a soffit on the basement side of the wall. I am drywalling the utility room side of the new wall. A soffit to enclose the trunk and pipes is not feasible in the utility room. I have installed a wood frame in the wall around the trunk and pipes. The wall does not need to be fire-proof, although firestop material (mineral wool) is installed to prevent fire from travelling through the soffit.
How do I make a nice looking joint between the utility room wall and the trunk and pipes? Should I caulk between the edge of the drywall and the trunk? Or use some sort of collar around the trunk? Or do I drywall as close to the penetrating objects as I can? Should I use mud to seal the wall to the trunk and pipes? The trunk is galvanized sheet metal covered with a thin metallic bubble-wrap insulation.