Nordyne M3RL Series installation instructions Downflow Furnace, Horizontal Venting

Downflow Furnace
			Vent	3 9/16"
				1 7/8"
			Combustion
			Air Intake Pipe
Seal/Caulk		See Vent Table 4
Around Pipe		Straps or Other Suitable		3 1/2"
at Building
		Supports at Minimum of			6"
		5 ft. Intervals
90˚ Elbow	Coupling			Top View
				Offset with
				Vent for Adequate
				Dimensional Clearance
12"		Upward Pitch - 1/4" Per Foot			Exhaust
	Wall	Outlet Exhaust Vent			Vent
Min.					PVC or
	First Support Should be as Close to				ABS pipe
		Furnace Connection as Possible
Normal Snow Level		Combustion Air	Furnace		3" x 2"
		Intake Pipe			Reducer

Figure 16. Horizontal Venting

Combustion Air Intake Pipe

Support System

on Vertical Rise

Below Joints

First support should be as close to furnace as possible

5'

Vent

Vent

Upward Pitch

1/4" per foot

Combustion Air Intake Pipe

Figure 17. Vertical Venting

5.Avoid areas where condensate drainage may cause problems by dropping on plant- ers or patios, etc. Also ensure that ex- haust gases will not impinge on windows or building surfaces, which may be com- promised or damaged by condensation. Do not install the vent terminal such that exhaust is directed into window wells, stairwells, under decks or into alcoves or similar recessed areas, and do not termi- nate above any public walkways.

6.Select the point of wall penetration where the minimum 1/4 inch per foot of slope up can be maintained.

!CAUTION:

For optimal performance vent furnace through wall which experiences the least exposure to winter winds.

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