Napoleon Fireplaces GD82NT - Manual (Page 7)

7
W45-0536 / C / 09.06.06
vertical
rise in
feet
v
T
figure 4
when
(H
T
) < (v
T
)
Simple venting configuration (only one 90° elbow)
See graph to determine the required vertical rise
v
T
for the
required horizontal run
H
T
.
For vent configurations requiring more than one 90° elbow,
the following formulas apply:
Formula 1: H
T
< v
T
Formula 2: H
T
+ v
T
< 40 feet
Example 1:
v
1
= 3 ft
v
2
= 8 ft
v
T
=
v
1
+
v
2
= 3 + 8 = ft
H
1
= .5 ft
H
2
= ft
H
R
=
H
1
+
H
2
= .5 + = 4.5 ft
H
O
= .03(three 90° elbows - 90°) = .03(70° - 90°) = 5.4 ft
H
T
=
H
R
+
H
O
= 4.5 + 5.4 = 9.9 ft
H
T
+ v
T
= 9.9 + = 0.9 ft
Formula :
H
T
< v
T
9.9 <
Formula :
H
T
+ v
T
< 40 feet
0.9 < 40
Since both formulas are met, this vent configuration is
acceptable.
figure 5
90°
90°
90°
H
1
v
2
H
2
v
1
horizontal vent run Plus offset in feet H
T
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
for the following symbols used in the venting calculations
and examples are:
> - greater than
> - equal to or greater than
< - less than
< - equal to or less than
H
T
- total of both horizontal vent lengths (
H
R
) and offsets
(
H
O
) in feet
H
R
- combined horizontal vent lengths in feet
H
O
- offset factor: .03(total degrees of offset - 90°
*) in
feet
v
T
- combined vertical vent lengths in feet
feet inches
° 0.03 0.5
5° 0.45 6.0
30° 0.9 .0
45° .35 6.0
90°
*
.7 3.0
* the first 90° offset has a zero value and is shown in the
formula as
-90°
DEFINITIONS ELBOW vENT LENGTH vALUES
TOP EXIT / HORIzONTAL TERMINATION