Drolet Heat Commander Installation And Operating Instructions Manual page 25

Heat Commander Furnace Installation and Operation Manual
5.2.3 Assembling the plenum extension (A) to the plenum (B)
Slide plenum (B) over the plenum
extension (A) to the extent determined
in Section 5.1.
Using 13 self-drilling screws (D),
secure the plenum (B) to the plenum
extension (A).
25