Air From Inside - Nordyne 072C-16 Installation Instructions Manual

Access for positioning and servicing must be considered
when locating the unit.
Clearances to Combustible Material, for clearance
specifications.
Keep all insulating materials away from the louvered door.
Insulating materials may be combustible.
This furnace may be installed directly on combustible wood
flooring or supports, if type "B-1" vent pipe is used (See
Figure 4). It is recommended for further reduction of fire
hazard that cement board or sheet metal be placed between
the furnace and the combustible floor and extend 12 inches
beyond the front of the louvered door.
18.75"
19.25"
Hole in
Floor
*RK 072-16; 096-12; 096-16;
120-20
Figure 3a. Opening for Concrete Slab
Concrete
Furnace
Floor
Plenum
Figure 3b. Furnace on a Concrete Slab
18.75"
19.63"
Hole in
Floor
*RK 072-16;
096-12; 096-16; 120-20
Figure 4. Opening in Wood Floor
Refer to Table 3, Minimum
13.25"
19.25"
Hole in
Floor
*RK 060-12;
072-12
Sheet
Metal
13.25"
19.63"
Hole in
Floor
*RK 060-12;
072-12
WARNING:
!
Furnaces installed with combustion air drawn
from a heated space which includes exhaust
fans, fireplaces, or other devices that may
produce a negative pressure should be
considered confined space installations.
See the venting section for venting guidelines and
specifications.
Air From Inside (See Figure 7)
If combustion air is taken from the heated space, the two
openings must each have a free area of at least one square
inch per 1,000 Btuh of total input of all appliances in the
confined space, but not less than 100 square inches of
free area. For example, if the combined input rate of all
appliances is less than or equal to 100,000 Btuh, each
opening must have a free area of at least 100 square
inches. If the combined input rate of all appliances is
120,000 Btuh, each opening must have a free area of at
least 120 square inches.
18.75"
or 13.25"*
16.75"
or 11.25"*
1.50"
19.75"
or 14.25"*
Figure 5. Downflow Sub-Base Dimensions
Downflow
Sub-base
Figure 6. Downflow Sub-Base Dimensions
* Smaller dimensions for *RK
060-12; 072-12
2.0"
28.38"
19.63"
1.58"
3"
Wood
Furnace
Floor
Sheet
Metal
Plenum
11