Nordyne M3RL Vent Table, Vent Termination Clearances for Direct Vent Furnaces

			*NOTES
	MAXIMUM		1.	Subtract 3.5 ft. for each additional 3" 90 degree elbow.
APPLICATION	DIRECT VENT, DUAL		2.	Two45degreeelbowsareequivalenttoone90degreeelbow.
	PIPE LENGTH (ft.)*		3.	One short radius elbow is equivalent to two long radius
				elbows.
PVC,CPVC or ABS	Inlet/Outlet
			4.	Donotincludeterminationelbowsincalculationofventlength.
SCH. 40 Pipe Size	3"	3"	5.	This table is applicable for elevations from sea level to 4000
Model M3RL 060	50	50		ft. Forhigherelevations,decreaseventpipelengthsby8%per
				1000 ft. of altitude.
Model M3RL 080	50	50
			6.	Only the above pipe materials are approved for use with these
				condensingfurnaces.

Table 6. Vent Table

	VENT TERMINAL	AIR SUPPLY INLET	AREA WHERE TERMINAL IS NOT PERMITTED
		Canadian Installations1		US Installations2
A =	Clearance above grade, veranda, porch,	12 inches (30 cm)		12 inches (30 cm)
	deck, or balcony
B =	Clearance to window or door that may be	6 inches (15 cm) for appliances ≤ 10,000		6 inches (15 cm) for appliances ≤ 10,000
	opened	Btuh (3 kW), 12 inches (30 cm) for		Btuh (3 kW), 9 inches (23 cm) for
		appliances > 10,000 Btuh (3 kW) and ≤		appliances > 10,000 Btuh (3 kW) and ≤
		100,00 Btuh (30 kW), 36 inches (91 cm) for		50,000 Btuh (15 kW), 12 inches (30 cm) for
		appliances >100,00 Btuh (30 kW)		appliances > 50,000 Btuh (15 kW)
C =	Clearance to permanently closed window	*		*
D =	Vertical clearance to ventilated soffit
	located above the terminal within a	*		*
	horizontal distance of 2 feet (61 cm) from
	the center line of the terminal
E =	Clearance to unventilated soffit	*		*
F =	Clearance to outside corner	*		*
G =	Clearance to inside corner	*		*
H =	Clearance to each side of center line	3 feet (91 cm) within a height 15 feet		*
	extended above meter/regulator assembly	above the meter/regulator assembly
I =	Clearance to service regulator vent outlet	3 feet (1.83 m)		*
J =	Clearance to nonmechanical air supply inlet	6 inches (15 cm) for appliances ≤ 10,000		6 inches (15 cm) for appliances ≤ 10,000
	to building or the combustion air inlet to any	Btuh (3 kW), 12 inches (30 cm) for		Btuh (3 kW), 9 inches (23 cm) for
	other appliance	appliances > 10,000 Btuh (3 kW) and ≤		appliances > 10,000 Btuh (3 kW) and ≤
		100,00 Btuh (30 kW), 36 inches (91 cm) for		50,000 Btuh (15 kW), 12 inches (30 cm) for
		appliances >100,00 Btuh (30 kW)		appliances > 50,000 Btuh (15 kW)
K =	Clearance to a mechanical air supply inlet	6 feet (1.83 m)		3 feet (91 cm) above if within 10 feet (3 m)
				horizontally
L =	Clearance above paved sidewalk or paved	7 feet (2.13 m) †		*
	driveway located on public property
M =	Clearance under veranda, porch deck, or	12 inches (30 cm) ‡		*
	balcony

1In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code

2In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code

†A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

*For clearances not specified in ANSI Z223.1 / NFPA 54 or CSA B149.1, the following statement shall be included:

“Clearance in accordance with local installation codes, and the requirements of the gas supplier and the manufacturer’s installation instructions.”

Figure 15. Vent Termination Clearances for Direct Vent Furnaces

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