Napoleon STARfire GD70NT-S Installation And Operation Instructions Manual page 10

10
when (H ) < (V )
T T
Simple venting configurations
FIGURE 11
See graph to determine the required vertical rise V
for the required horizontal run H
(H ) > (V )
when
T T
Simple venting configurations
FIGURE 12
See graph to determine the required vertical rise V
H
required horizontal run
20
19
MAXIMUM
VERTICAL
10
RISE IN
FEET
3
V
0
T 5
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
values for H and V .
T T
W415-0434 / D / 09.06.07
VERTICAL TERMINATION
T
.
T
for the
T
.
T
1 0 15 2 0 25
REQUIRED
VERTICAL RISE
IN FEET
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
values for H and V .
T T
For vent configurations requiring more than zero 90° elbow
(top exit) or one 90° elbow (rear exit), the following formu-
las apply:
Formula 1: H < V
T
Formula 2: H + V
T
For vent configurations requiring more than two 90° elbow the
following formulas apply:
Formula 1: H < 3V
T
Formula 2: H + V
T
Example 7:
90°
V
1
V
= 2 ft
1
V
= 1 ft
2
V
= 1.5 ft
3
V = V + V + V
T 1 2
H
= 6 ft
30
1
H
= 2 ft
2
H = H + H
= 6 + 2 = 8 ft
T
R 1 2
H
= .03(four 90° elbows - 90°)
O
= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft
H = H + H
= 8 + 8.1 = 16.1 ft
T R O
H + V
= 16.1 + 4.5 = 20.6 ft
T T
H < 3V
Formula 1:
T
3V
16.1 > 13.5
Since this formula is not met, this vent configuration is
unacceptable
H + V
Formula 2:
T T
20.6 < 40
Since only formula 2 is met, this vent configuration is unac-
ceptable and a new fireplace location or vent configuration
will need to be established to satisfy both formulas.
40
30
20
10
3
0
5 1 0 15
T
< 40 feet
T
T
< 40 feet
T
90°
V
H
V
2
2
H
1
90°
FIGURE 13
= 2 + 1 + 1.5 = 4.5 ft
3
T
= 3 x 4.5 = 13.5 ft
T
< 40 feet
2 0
H
T
3
90°