Definitions; Elbow Vent Length Values - Napoleon GDS20N Installation And Operating Instructions Manual

3.5

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
3.6

ELBOW VENT LENGTH VALUES

FEET
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.
INCHES MILLIMETERS
0.5 12.7
6.0 152.4
11.0 279.4
16.0 406.4
32.0 812.8
13
14.2
15.2A
W415-0496 / H / 07.16.13
EN