Napoleon Fireplaces GDS60N manual TOP Exit Horizontal Termination, Ht Vt

17

3.8TOP EXIT HORIZONTAL TERMINATION

(HT) > (VT)

Simple venting configuration (only one 90° elbow)

See graph to determine the required vertical rise VT for the

required horizontal run HT.

147”

150

FIGURE 3.8a

REQUIRED	100
VERTICAL
RISE IN
INCHES VT	57”
	50
	19 1/2”
	0	5	10	15	20
		2’		12.5’	19.5’

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:

Formula 1: HT

< 4.2 VT

Formula 2: HT

+ VT < 24.75 feet

90°

H1

H2

Example 2:

V1

= VT = 6 FT

FIGURE 3.8b

90°

H1

= 3 FT

V1

H2

= 5 FT

HR

= H1

+ H2

= 3 + 5 = 8 FT

HO

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

HT

= HR

+ HO

= 8 + 2.7 = 10.7 FT

HT

+ VT

= 10.7 + 6 = 16.7 FT

Formula 1:

H

< 4.2 V

Formula 2:

T

4.2 VTT = 4.2 x 6 = 25.2 FT

HT

+ VT < 24.75 FT

90°

16.7 < 24.75

90°

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

90°

H

H4

Example 3:

1

V2

H2

H3

V1

= 4 FT

V2

= 1.5 FT

= 4 + 1.5 = 5.5 FT

FIGURE 3.8c

V1

90°

V

T

= V + V

2

1

H1

= 2 FT

H2

= 1 FT

H3

= 1 FT

H4

= 1.5 FT

+ H3 + H4 = 2 + 1 + 1 + 1.5 = 5.5 FT

HR

= H1

+ H2

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

4.2 VT = 4.2 x 5.5 = 23.1 FT

13.6 < 23.1

Formula 2:

HT

+ VT < 24.75 FT

19.1 < 24.75

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

16.1_2

W415-0788 / A / 09.22.09