Working in the garage where there is duct work. I took off the insulation around it and found unplugged holes in the duct work. There are similar holes that have these black caps in duct work in another area of the garage and in the furnace room.
Where can I get these caps, or whatever you call them. And where can I get the proper insulation to replace the old insulation that was around the duct work. It looked like regular R-13. I don't think I can fit anything thicker around it, due to the spacing issues between the ceiling, duct, and outside garage wall. But I've seen an aluminum looking coating on some duct work in newer houses. The duct work in the garage is 55 years old.