Napoleon Fireplaces B36DFN When H T V T, Simple venting configuration only one 45º and 90 elbow

11

HORIZONTAL TERMINATION

when (HT) > (VT)	Example 2:
Simple venting configuration (only one 45º and 90° elbow)

See graph to determine the re-

quired vertical rise VT for the re- FIGURE 7 quired horizontal run HT.

REQUIRED

VERTICAL

RISE IN

INCHES (VT)

HORIZONTAL VENT RUN PLUS OFFSETS IN FEET (HT)

FIGURE 8	90°	90°	H4
45°		H3
	H1		V2
		H2

V1 90°

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 + three 90º elbow -135º)
	=.03(315-135)=5.4ft
HT	= HR + HO = 5.5 +5.4 = 10.9 ft

HT + VT = 10.9 + 5.5 = 16.4 ft

Formula 1: HT < 4.2 VT

4.2VT = 4.2 x 5.5 = 23.1 ft

10.9< 23.1

Formula 2: HT + VT < 24.75 feet

16.4 < 24.75

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 ac- ceptable.

W415-0484 / A / 07.23.06