I noticed on my new furnace installation that there is a lot of air leakage where they connected the new ductwork to the the outlet on the furnace/coil. It seems like there should have been some sort of sealant. This seems inefficient or I am being too critical. I noticed the leakage when I was standing by the furnace I felt the draft in my face. There are open holes on all of the corners and alot of air leakage on some of the sides as well.