Downflow

 

Wood

Sub-base

Furnace

Floor

 

Sheet

 

 

Metal

 

 

Plenum

 

Figure 8. Furnace on a Wood Floor

 

 

* RL 040/060

18.75"

 

** RL 120

 

 

 

 

or 13.25" or 21.50"*

 

 

 

 

 

 

2.0"

16.75"

28.38"

 

or 11.25"

 

 

 

3 lbdensity

 

1.50"

 

thick fiberglass

19.63"

 

 

 

1.58"

 

 

1 inch

 

 

 

 

19.75"

 

3"

 

or 14.25"*

 

 

 

or 22.50"**

 

 

 

Figure 9. Downflow Sub-Base

Dimensions

14

Upflow Models

Protective

Screen

Downflow Models

 

Figure 10. Protective Screen for

One Pipe Installations

 

Each opening must

 

be at least 100 sq. in.

 

or 1 sq. in. per 1000

Vent or

Btuh of total input

Chimney

rating, whichever is

 

greater. See minimum

 

area per table.

12" Max.

Furnace

12" Max.

Water Heater

 

Minimum

 

Total Input

Free Area

Round Duct

Rating (Btuh) (Each Opening)

Diameter

40,000

100 sq. in.

12"

60,000

100 sq. in.

12"

80,000

100 sq. in.

12"

100,000

100 sq. in.

12"

120,000

120 sq. in.

13"

140,000

140 sq. in.

14"

160,000

160 sq. in.

15"

Figure 11. Equipment in a Confined Space with all Combustion Air drawn from Inside

Page 14
Image 14
Nordyne RL 90+, RC 92+ installation instructions Furnace on a Wood Floor, Downflow Sub-Base Dimensions