Napoleon Fireplaces GDS60N manual Ht Vt, for the, required horizontal run HT, Vertical, Rise In

20

(HT) > (VT)

Simple venting configuration	See graph to determine the required vertical rise VT	for the
(only two 90° elbows)
	required horizontal run HT.

	REQUIRED
	VERTICAL
	RISE IN
FIGURE 3.10c	INCHES VT

147	150
	100
66
	50
12
	0	2.5	5	7.5	10	12.5	15	17.5	20
	1		3.5						19.25

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

The shaded area within the lines represents acceptable

values for HT and HT

90°

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

Formula 1: HT

< 3.5VT

H3

Formula 2: HT

+ VT < 24.75 feet

Example 4:

90°

V2

V1

= 4 FT

V2

= 1.5 FT

H2

VT

= V1

+ V2 = 4 + 1.5 = 5.5 FT

H1

= 2 FT

H2

= 1 FT

90°

V1

H3

= 1 FT

H4

= 1.5 FT

H

R

= H

1

+ H

+ H

+ H = 2 + 1 + 1 + 1.5 = 5.5 FT

2

3

4

HO

= .03 (four 90° elbows + one 45° elbow - 90°)

H1

= .03 (90 + 90 + 90 + 90 + 45 - 90) = 9.45 FT

90°

HT

= HR

+ HO

= 5.5 + 9.45 = 14.95 FT

HT

+ VT

= 14.95 + 5.5 = 20.45 FT

FIGURE 3.10d

Formula 1:

HT

< 3.5VT

3.5VT = 3.5 x 5.5 = 19.25 FT

14.95 < 19.25

Formula 2:

HT

+ VT < 24.75 FT

20.45 < 24.75

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

16.3_2

W415-0788 / A / 09.22.09