Napoleon Fireplaces GDS26P, GDS26N manual Rear Exit / Horizontal Termination

12

REAR EXIT / HORIZONTAL TERMINATION

	Example 5:
(HT) > (VT)

Simple venting configuration (only two 90° elbows)

FIGURE 14

90°

H

V

2

4

90°

H

H3

90°

2

V

45°

1

H1

90°

FIGURE 15

See graph to determine the required vertical rise VT for the
required horizontal run HT				V1	=4 ft
147	150			V2	=1.5 ft
				VT	= V1 + V2 = 4 + 1.5 = 5.5 ft
				H1	=2 ft
REQUIRED				H2	=1 ft
VERTICAL				H3	=1 ft
RISE IN				H4	=1.5 ft
INCHES	100			HR	= H1	+ H2 + H3 + H4 = 2 + 1 + 1 + 1.5 = 5.5 ft
VT				HO	= .03(four 90° elbows + one 45° elbow - 90°)
					= .03(90 + 90 + 90 + 90 + 45 - 90) = 9.45 ft
				HT	=HR + HO = 5.5 + 9.45 = 14.95 ft
63				HT + VT	= 14.95 + 5.5 = 20.45 ft
				Formula 1:		HT < 3.5VT
	50					3.5VT = 3.5 x 5.5 = 19.25 ft
						14.95 < 19.25
				Formula 2:		HT + VT < 24.75 feet
						20.45 < 24.75
12				Since both formulas are met, this vent configuration is
	10			acceptable.
	0	5	15	25
	1	3.5	12.5	19.25

HORIZONTAL VENT RUN PLUS OFFSETS IN FEET HT

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

For vent configurations requiring more than two 90° elbows the following formulas apply:

Formula 1: HT < 3.5VT

Formula 2: HT + VT < 24.75 feet

W415-0607 / A / 01.18.08