Napoleon Fireplaces GDS25N GDS25P manual Formula 2 HT + VT 24.75 feet, Ht + Vt

12

HORIZONTAL TERMINATION

when (HT) > (VT)

Simple venting configuration (only one 45º and 90° elbow)

See graph to determine

the required vertical rise VTFIGURE 7 for the required horizontal

run HT.

Example 2:	90°		90°
FIGURE 8		H3
	H1		H4
45°		H2	V2
	90°
V1

	150
	140				V1	= 4 ft
REQUIRED
	130				V2	= 1.5 ft
VERTICAL	120				VT	= V1 + V2 = 4 ft + 1.5 ft = 5.5 ft
RISE IN	110				H1	= 2 ft
INCHES (VT)
	100				H2	= 1 ft
	90				H3	= 1 ft
					H4	= 1.5 ft
	80				HR	= H1 + H2 + H3 + H4 = 2 + 1 + 1 + 1. 5 = 5.5 ft
	70				HO	= .03(one 45º elbow + three 90º elbow -135º)
	60					=.03(315-135)=5.4ft
					HT	= HR + HO = 5.5 +5.4 = 10.9 ft
	50
					HT + VT	= 10.9 + 5.5 = 16.4 ft
	40
					Formula 1: HT < 4.2 VT
	30
						4.2 VT = 4.2 x 5.5 = 23.1 ft
	20
						10.9 < 16.8
	10
					Formula 2: HT + VT < 24.75 feet
	0	5	10	15
					20	16.4 < 24.75
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET

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

For vent configurations requiring more than one 45º and 90° elbow the following formulas apply:

Formula 1: HT < 4.2 VT

Formula 2: HT + VT < 24.75 feet

Since both formulas are met, this vent configuration is acceptable.

W415-0547 / B / 05.08.06