his is a special size coil we have ordered we only have a few 15x24 coil measurement / 130,000 BTU For use in your hot air furnace plenum.These are heavy built units, 12 fins per inch. 3 1/2" thick, 15.5" wide, 26" long (not including the manifold that sticks out of the plenum). Quality unit with .006" aluminum fins, 3/8" copper inner tubing, and 20 gauge outer casing. 130K BTU perfect for heating a home/shop or garage. 3 row pass system for efficiency/longer life. › See more product details