What are the installation requirements for upflow furnaces with B-width coils?
Heat Shield Kits MAYBFERCOLKITA, MAYCFERCOLKITA, or MAYDFERCOLKITA must be used for B-, C-, and D-width coils respectively when installed in all orientations on upflow furnaces. (Page 3)
From the official Trane S9x1 manual, page 3
Have a follow-up question?
Answers from the official manual.
Common questions