Napoleon Fireplaces GE38NT-M, GE38PT-M manual 90 H

11

TOP EXIT VERTICAL TERMINATION

when (Ht) > (Vt)

Simple venting configurations

See graph to determine the required vertical rise VT for the required horizontal run HT.

FIGURE 12

VT	= V1 + V2 + V3 = 2 + 1 + 1.5 = 4.5 ft
H1	=6 ft
H2	=2 ft
HR	= H1 + H2 = 6 + 2 = 8 ft
HO	= .03(four 90° elbows - 90°)
	= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft
HT	= HR + HO = 8 + 8.1 = 16.1 ft

HT + VT = 16.1 + 4.5 = 20.6 ft

Formula 1: HT < 3VT

3VT = 3 x 4.5 = 13.5 ft

16.1 > 13.5

Since this formula is not met, this vent configuration is unacceptable.

Formula 2: HT + VT < 40 feet

20.6 < 40

For vent configurations requiring elbows, the following for- mulas apply:

Since only formula 2 is met, this vent configuration is unac- ceptable and a new fireplace location or vent configuration will need to be established to satisfy both formulas.

MAXIMUM

VERTICAL

RISE IN

FEET

VT

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

The shaded area within the lines represents acceptable values for HT and VT .

Formula 1: HT < 3VT

Formula 2: HT + VT < 40 feet

Example 5:

V1	=2 ft
V2	=1 ft
V3	=1.5 ft

90°		90°
		V3
V		H2
1	H1	V2
		90°
		90°

FIGURE 13

Example 6:

V1	=1.5 ft
V2	=5 ft
VT	= V1 + V2	= 1.5 + 5 = 6.5 ft
	90°	V2
		H3 45°
90° H
	2	90°
	V1
H		H
1		4

FIGURE 14

H1	=1 ft
H2	=1 ft
H3	=1 ft
H4	=10.75 ft
HR	= H1 + H2 + H3 + H4 = 1 + 1 + 1 + 10.75 = 13.75 ft
HO	= .03(four 90° elbows + one 45° elbow - 90°)
	= .03(90 + 90 + 90 + 90 + 45 - 90) = 9.45 ft
HT	=HR + HO = 13.75 + 9.45 = 23.2 ft

HT + VT = 23.2 + 6.5 = 29.7 ft

Formula 1: HT < 3VT

3VT = 3 x 6.5 = 19.5 ft

19.5 = 19.5

Formula 2: HT + VT < 40 feet

29.7 < 40

Since both formulas are met, this vent configuration is ac- ceptable.

W415-0429 / C / 11.04.05