United States Stove Company 1800 - Manual (Page 28)

Notched both sides
for Blower Wire.
Insert the filter and slide the filter cap into place.
The 18" square air intake can be fitted with a collar
to accept a return cold air duct.
C
D
B
A
D
B
C
B
E
1
4
3
2
26
A
B
D
FILTER BOX OPTION MODEL 1600 / 1800
20" x 20" x 1" Filter Required
Assemble filter box sections in the order shown in the
illustration and secure with sheet metal screws provided.
1. Assemble parts B and C to part E - bottom.
2. Attach to back of furnace.
3. Assemble part D to parts B and C.
4. Assemble part A - top, after you have attached filter box to
furnace and blower is inside filter box on furnace.
NOTE: The side with the 18" square hole can be used
as the right or left side. If you want filter on left side of
furnace, part "B" should be as shown. If you want filter
on right side of furnace, parts "B" and "C" should be
reversed.
4
LARGE FILTER BOX KIT #C61899