Napoleon Fireplaces GD82NT - Manual (Page 9)

9
W45-0536 / C / 09.06.06
required vertical
rise in feet
v
T
horizontal vent run Plus offset in
feet
H
T
when
(H
T
) < (v
T
)
figure 9
For vent configurations requiring more than zero
90° elbow (top exit) or one 90° elbow (rear exit), the
following formulas apply:
Formula 1: H
T
< v
T
Formula 2: H
T
+ v
T
< 40 feet
See graph to
determine the
required vertical rise
v
T
for the required
horizontal run
H
T
.
TOP EXIT vERTICAL TERMINATION
The shaded area within the lines represents ac-
ceptable values for H
T
and V
T
.
maximum
vertical
rise in
feet
v
T
horizontal vent run Plus offset in feet H
T
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
See graph to determine the required vertical rise
v
T
for the
required horizontal run
H
T
.
figure 11
v
3
= .5 ft
v
T
=
v
1
+
v
2
+
v
3
= + + .5 = 4.5 ft
H
1
= 6 ft
H
2
= ft
H
R
=
H
1
+
H
2
= 6 + = 8 ft
H
O
= .03(four 90° elbows - 90°)
= .03(90 + 90 + 90 + 90 - 90) = 8. ft
H
T
=
H
R
+
H
O
= 8 + 8. = 6. ft
H
T
+ v
T
= 6. + 4.5 = 0.6 ft
Formula :
H
T
< 3v
T
3v
T
= 3 x 4.5 = 3.5 ft
6. > 3.5
Since this formula is not met, this vent configuration is
unacceptable.
Formula :
H
T
+ v
T
< 40 feet
0.6 < 40
Since only formula 2 is met, this vent configuration
is unacceptable and a new fireplace location or vent
configuration will need to be established to satisfy both
formulas.
figure 10
H
1
H
2
v
3
v
1
90°
90°
90°
v
2
90°
when
(H
T
) > (v
T
)
Simple venting configurations
TOP vERTICAL TERMINATION
For vent configurations requiring more than two 90° elbow
(top exit) or one 90° elbow (rear exit), the following formulas
apply:
Formula 1: H
T
< 3v
T
Formula 2: H
T
+ v
T
< 40 feet
Example 7:
v
1
= ft
v
2
= ft