11

REAR EXIT / HORIZONTAL TERMINATION

(HT) < (VT)

Example 4:

Simple venting configuration (only two 90° elbows)

FIGURE 12

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

H1

 

 

90°

 

V2

H3

 

 

 

 

90°

V1

 

H2

90°

90°

FIGURE 13

39 40

REQUIRED VERTICAL 30 RISE IN FEET

V1

=9 ft

V2

=6 ft

VT

= V1 + V2 = 9 + 6 = 15 ft

H1

=3 ft

H2

=2 ft

H

 

VT

20

10

0

2.5

5

7.5

10

12.5

15

17.5

20

HR3

 

=1.5 ft

 

= H1 + H2 + H3 = 3 + 2 + 1.5 = 6.5 ft

HO

 

= .03(four 90° elbows - 90°)

 

 

= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft

HT

+ VT

=HR + HO = 6.5 + 8.1 = 14.6 ft

HT

=14.6 + 15 = 29.6 ft

HORIZONTAL VENT RUN PLUS OFFSETS IN FEET HT

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

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

Formula 1: HT < VT

Formula 2: HT + VT < 40 feet

Formula 1: HT < VT 14.6 < 15

Formula 2: HT + VT < 40 feet 29.6 < 40

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

W415-0607 / A / 01.18.08

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Napoleon Fireplaces GDS26N, GDS26P manual Rear Exit / Horizontal Termination, HR3

GDS26P, GDS26N specifications

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