Subbases for Combustible Floors Dimensions
Subbase for Combustible
Floors Part Number
Furnace Subbaee
NAHH001SB
NAHH002SB
NAHH003SB
NAHH010SB
Subbase for
Coil Cabinets
NAHH004SB
NAHH005SB
NAHH006SB
NAHH009SB
Subbase for Combustible
Floor Dimensions
H* J* K**
1511/16 283/4 149/16 16
195/16 283/4 183/16 16
225/16 283/4 2113/16 16
243/4 209/I6 239/16 161/4
1511/t6 209/I6 149/16 161/4
195/16 209/16 183/16 161/4
23 209/16 2113/16 161/4
2411/t6 283/4 239/16 16
Opening In Floor
M N
161/4 145/8
181/4 18t/4
181/4 217/8
161/4 235/8
161/4 145/8
181/4 18t/4
181/4 217/8
161/4 235/8
Opening In Base
For Plenum
P R
15 131/2
15 171/8
15 193/4
15 221/2
15 131/2
15 171/8
15 193/4
15 221/2
Typical Plenum
Dimensions
S T
15 131/2
15 17t/8
15 193/4
15 221/2
15 131/2
15 17t/8
15 193/4
15 221/2
* Outside Dimension
** Base Spacer Side To Side
3. Set the base over the opening in the floor, centering it over
the opening. Fasten the base to the floor with screws or
nails. See Figure 35, Figure 36 and Figure 37.
Plenum
l"
Combustible
Floor Base
Furnace Subbase
25-20-46
A = 41/4" Minimum clearance from back of hole
to wall or other obstruction.
Coil Cabinet Subbase
25-20-46b
Plenum
A = 4 1/4" Minimum clearance from back of hole to wail or other obstruction,
4. Drop the plenum through the opening in the base. The
flange of the plenum should rest on top of the subbase.
5. Position furnace or coil cabinet and furnace on subbase so
it aligns between the locating tabs.
Setting the Subbase
Furna
Insulation of
Combustible
Floor Bas
J
___ _"_/W_dood Floor
Wood Scre_ _/_ _ Plenum 25-20-46a
This subbase for combustible floors has been designed so that
the height of the subbase raises the downflow coil off the floor to
allow easy installation of the condensate drain. See Figure 38.
[_ 44001 101004