USSC Clayton 1600M Installation & Operator's Manual page 19

The back draft damper may be installed in either a vertical or horizontal section of the hot air duct. It should be positioned as close to
the plenum opening of the furnace as practical. Press female end of the back draft damper over Clayton Furnace collar or male end
of the duct pipe. When properly placed the arrows on the air flow decal should point away from the furnace.
HORIZONTAL
INSTALLATION
INSTALLING OPTIONAL BACK DRAFT DAMPER
NOTE: POSITION SO
THAT AIR FLOW WILL
OPEN DAMPER IN
DIRECTION OF
DUCTWORK.
19
SEE PRODUCT
LABEL.
NOTE: POSITION SO
THAT AIR FLOW WILL
OPEN DAMPER
FROM BOTTOM.
VERTICAL
INSTALLATION