Formula 2 HT + VT 24.75 feet | Napoleon Fireplaces BGD48P, BGD48N

HORIZONTAL TERMINATION

when (HT) > (VT)

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

See graph to determine the required

vertical rise VT for the required hori- FIGURE 8 zontal run HT.

Example 2:

FIGURE 9		90° 90°
90°	H1	H3	V
		H3	V
			2

45°

90°

REQUIRED

VERTICAL

RISE IN

INCHES (VT)

HORIZONTAL VENT RUN PLUS OFFSETS IN FEET

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

For vent conﬁ gurations 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

V1	= 4 ft
V2	= 1.5 ft
VT	= V1 + V2 = 4 ft + 1.5 ft = 5.5 ft
H1	= 2 ft
H2	= 1 ft
H3	= 1 ft
H4	= 1.5 ft
HR	= H1 + H2 + H3 + H4 = 2 + 1 + 1 + 1. 5 = 5.5 ft
HO	= .03 (one 45º elbow + four 90º elbows -135º)
	=.03 (405-135)=8.1ft
HT	= HR + HO = 5.5 + 8.1 = 13.6ft
HT + VT	= 13.6 + 5.5 = 19.1 ft

Formula 1: HT < 4.2 VT

4.2VT = 4.2 x 5.5 = 23.1 ft

13.6< 23.1

Formula 2: HT + VT < 24.75 feet

19.1 < 24.75

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

W415-0326 / C / 11.23.07

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