Nordyne RL 90+, RC 92+ Furnace on a Wood Floor, Downflow Sub-Base Dimensions

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