YOU ASKED FOR IT, NOW HERE IT IS! A HIGH QUALITY EXCHANGER AT A GREAT PRICE, 20 x 19 SIZE. THE METAL AROUND THE COIL IS 20 X 21 X 3 ½ INCH SIZE (NOT INCLUDING MANIFOLD THAT STICKS OUT OF THE PLENUM). 159,000 BTU, 3 ROW PASS. THIS UNIT HAS A LIFETIME PRO RATED WARRANTY THAT COVERS CUSTOMER ABUSE! YES, CUSTOMER ABUSE AS LONG AS YOU RETURN THE BAD EXCHANGER TO US. A COPY OF THE WARRANTY CAN BE SENT ON REQUEST. 1' COPPER PUSH ON OR SWEAT HEADERS. THIS ITEM IS NEW IN BOX. THE PHOTO IS NOT THE EXACT UNIT, BUT SHOWN AT A DIFFERENT SIZE SO YOU CAN GET THE IDEA OF WHAT YOU ARE GETTING. IF YOU HAVE QUESTIONS, PLEASE CONTACT US AND LET OUR KNOWLEDGEABLE STAFF HELP YOU GET YOUR PROJECT DONE RIGHT. NO NEED TO SHOP AROUND, BUY HERE WITH CONFIDENCE!