Nordyne + RC 92+ Installation Instructions Manual page 14

Downflow
Sub-base
Furnace
Sheet
Metal
Plenum
Figure 8. Furnace on a Wood Floor
18.75"
or 13.25" or 21.50"*
16.75"
or 11.25"
1.50"
19.75"
or 14.25"*
or 22.50"**
Figure 9. Downfl ow Sub-Base
Dimensions
14
Wood
Floor
* RL 040/060
** RL 120
2.0"
28.38"
19.63"
1.58"
3"
Upfl ow Models
Downfl ow Models
Figure 10. Protective Screen for
One Pipe Installations
Vent or
Chimney
Furnace
Water Heater
Minimum
Total Input Free Area
Rating (Btuh) (Each Opening)
40,000 100 sq. in.
60,000 100 sq. in.
80,000 100 sq. in.
100,000 100 sq. in.
120,000 120 sq. in.
140,000 140 sq. in.
160,000 160 sq. in.
Figure 11. Equipment in a Confi ned Space
with all Combustion Air drawn from Inside
Protective
Screen
Each opening must
be at least 100 sq. in.
or 1 sq. in. per 1000
Btuh of total input
rating, whichever is
greater. See minimum
area per table.
12" Max.
12" Max.
Round Duct
Diameter
12"
12"
12"
12"
13"
14"
15"