Vertical Termination - Napoleon LHD50N Installation And Operating Instructions Manual

16
2.8

VERTICAL TERMINATION

Simple venting configurations.
For vent configurations requiring more than zero 90° elbows the following formulas apply:
Formula 1: H < V
T
Formula 2: H + V
T
Example 6:
V = 5 FT
1
V = 6 FT
2
V = 10 FT
3
V = V + V + V = 5 + 6 + 10 = 21 FT
T 1 2 3
H = 8 FT
1
H = 2.5 FT
2
H = H + H = 8 + 2.5 = 10.5 FT
R 1 2
H = .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 FT
H = H + H = 10.5 + 8.1 = 18.6 FT
T R O
H + V = 18.6 + 21 = 39.6 FT
T T
Formula 1: H
18.6 < 21
Formula 2: H
39.6 < 40
Since both formulas are met, this vent configuration is acceptable.
W415-0745 / 02.16.09
FIGURE 2.8a
T
< 40 feet
T
< 3.5 V
T T
+ V < 40 FT
T T
(H ) < (V )
T T
See graph to determine the required vertical rise V
required horizontal run H
40
30
REQUIRED
VERTICAL 20
RISE IN
FEET V
T
10
3
0
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
90°
V
1
.
T
5 10 15
values for H and V
T T
90°
H
2
V
H
2
1
90°
FIGURE 2.8b
18.1
for the
T
20
T
V
3
90°