Vent Application Flow Chart; Definitions; Elbow Vent Length Values - Napoleon BGD42N Installation And Operating Instructions Manual

3.5

VENT APPLICATION FLOW CHART

Horizontal Termination
Vertical rise is equal
to or greater than
the horizontal run
Horizontal run +
vertical rise to
maximum of 40 feet
3.6

DEFINITIONS

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 - total of both horizontal vent lengths (Hr) and offsets (Ho) in feet
T
H - combined horizontal vent lengths in feet
R
H - offset factor: .03 (total degrees of offset - 135°*) in feet
O
V - combined vertical vent lengths in feet
T
3.7

ELBOW VENT LENGTH VALUES

FEET INCHES
1° 0.03
15° 0.45
30° 0.9
45° 1.35
90°* 2.7
* The fi rst 45° and 90°offset has a zero value and is shown in the formula as -45° and - 90° respectively or
-135° when combined.
Vertical rise is less
than horizontal run
Horizontal run +
vertical rise to
maximum of 24.75
feet
4.2 times the
vertical rise equal to
or greater than the
horizontal run
0.5
6.0
11.0
16.0
32.0
Vertical Termination
Vertical rise is equal
to or greater than
the horizontal run
Horizontal run +
vertical rise to
maximum of 40 feet
Vertical rise is less
than horizontal run
Horizontal run +
vertical rise to
maximum of 40 feet
3 times the vertical
rise equal to or
greater than the
horizontal run
13.1
14.2
15.2
W415-0777 / A / 04.27.10
13