Napoleon Grills BGD38NT, BGD38PT TOP EXIT / HORIZONTAL TERMINATION

9
W415-0244 / A / 05.15.03
for the following symbols used in the venting calcula-
tions and examples are:
>- greater than
>- equal to or greater than
<- less than
<- equal to or less than
HT- total of both horizontal vent lengths (HR) and offsets
(HO) in feet
HR- combined horizontal vent lengths in feet
HO- offset factor: .03(total degrees of offset - 90°*) in
feet
VT- combined vertical vent lengths in feet
feet inches
1° 0.03 0.5
15° 0.45 6.0
30° 0.9 11.0
45° 1.35 16.0
90°*2.7 32.0
* the first 90° offset has a zero value and is shown in
the formula as -90°
when (HT) < (VT)
Simple venting configuration (only one 90° elbow)
FIGURE 5
See graph to determine the required vertical rise VT for the
required horizontal run HT.
For vent configurations requiring more than one 90° el-
bow, the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet
Example 1:
90°
90°
V
1
=3 ft
V
2
=8 ft
VT= V
1
+ V
2
= 3 + 8 = 11 ft
H
1
= 2.5 ft
H
2
=2 ft
H
R
=H
1
+ H
2
= 2.5 + 2 = 4.5 ft
H
O
=. 03(three 90° elbows - 90°) = .03(270° - 90°) = 5.4 ft
H
T
=H
R
+ H
O
= 4.5 + 5.4 = 9.9 ft
H
T
+ V
T
= 9.9 + 11 = 20.9 ft
Formula 1: H
T
< V
T
9.9 < 11
Formula 2: H
T
+ V
T
< 40 feet
20.9 < 40
Since both formulas are met, this vent configuration is ac-
ceptable.
FIGURE 6
90°
H1
V2
H2
V1
ELBOW VENT LENGTH VALUES
DEFINITIONS
VERTICAL
RISE IN
FEET
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT
The shaded area within the lines represents acceptable
values for HT and VT .
TOP EXIT / HORIZONTAL TERMINATION