Napoleon Fireplaces BGD90PT, BGD90NT manual H1 H2

H1

H2

HR

HO

HT

V1

8

HORIZONTAL TERMINATION

when (HT) > (VT)

Simple venting confi guration (only one 90° elbow)

FIGURE 6

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

REQUIRED

VERTICAL

RISE IN

INCHES

VT

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

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

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

Example 3:

	90°
H1	H4
	V2
90°	H2 H3
V1
	FIGURE 8

V1	= 4 ft
V2	= 1.5 ft
VT	= V1 + V2 = 4 + 1.5 = 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(four 90° elbows - 90°) = .03(360° - 90°) = 8.1 ft
HT	= HR + HO = 5.5 + 8.1 = 13.6 ft

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

Formula 1: HT < 4.2 VT

Formula 2: HT + VT < 24.75 feet

Example 2:

V1 90°

H1 H2

FIGURE 7

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

= VT = 6 ft = 3 ft

= 5 ft

= H1 + H2 = 3 + 5 = 8 ft

= .03(two 90° elbows - 90°) = .03(180° - 90°) = 2.7 ft

= HR + HO = 8 + 2.7 = 10.7 ft HT + VT= 10.7 + 6 =16.7

Formula 1: HT < 4.2 VT

4.2VT = 4.2 x 6 = 25.2 ft

10.7< 25.2

Formula 2: HT + VT < 24.75 feet

16.7 < 24.75

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

W415-0580 / C / 04.07.08