Definitions; Elbow Vent Length Values - Napoleon GDS25N Installation And Operating Instructions Manual

12
3.4

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
3.5

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.
W415-0547 / G / 12.15.10
0.5
6.0
11.0
16.0
32.0
14.2
15.2