10

TOP EXIT / HORIZONTAL TERMINATION

 

 

 

(HT) > (VT)

 

Example 2:

 

 

Simple venting configuration

FIGURE 9

V1

= VT

= 6 ft

(only one 90° elbow)

H1

= 3 ft

 

 

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

 

 

Formula 1:

HT < 4.2 VT

 

 

 

 

4.2 VT = 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 configuration is ac- ceptable.

Example 3:

See graph to determine the required vertical rise VT for the

 

 

 

H3

required horizontal run HT.

 

 

 

 

 

 

 

 

150

 

 

 

 

 

 

 

90°

REQUIRED

140

 

 

 

 

 

 

 

H4

VERTICAL

130

 

 

 

 

 

 

 

V2

RISE IN

120

 

 

 

 

 

 

 

INCHES

110

 

 

 

 

 

 

 

 

VT

 

 

 

 

V1

H1

H2

100

 

 

 

 

 

 

 

 

 

 

 

90

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

FIGURE 11

 

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

V1

 

= 4 ft

 

 

 

20

 

 

 

 

V2

 

= 1.5 ft

 

 

 

10

 

 

 

 

VT

 

= V1 + V2 = 4 + 1.5 = 5.5 ft

 

 

0

5

10

15

20

H1

 

= 2 ft

 

 

 

H

 

= 1 ft

 

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

 

 

H32

 

= 1 ft

 

The shaded area within the lines represents acceptable

H4

 

= 1.5 ft

 

values for HT and VT .

 

 

 

 

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

For vent configurations requiring more than one 90° elbow

HT

 

= HR + HO = 5.5 + 8.1 = 13.6 ft

the following formulas apply:

 

 

 

 

HT

+ VT = 13.6 + 5.5 = 19.1 ft

Formula 1: HT

< 4.2 VT

 

 

 

 

Formula 1: HT

< 4.2 VT

Formula 2: HT

+ VT < 24.75 feet

 

 

 

 

 

4.2 VT = 4.2 x 5.5 = 23.1 ft

 

 

90°

 

 

 

 

 

 

13.6 < 23.1

 

 

 

 

 

 

Formula 2: HT

+ VT < 24.75 feet

 

 

 

 

 

 

 

 

 

19.1 < 24.75

 

 

 

 

 

V

1

H1

H2

Since both formulas are met, this vent configuration is

 

 

 

FIGURE10

acceptable.

 

 

 

 

W415-0607 / A / 01.18.08

Page 10
Image 10
Napoleon Fireplaces GDS26P manual = H R + H O = 8 + 2.7 = 10.7 ft, + V T= 10.7 + 6 =16.7, T = 4.2 x 6 = 25.2 ft, Acceptable

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