Napoleon Fireplaces Arlington - GDS20 - Manuel (Page 13)

W415-0496 / H / 07.16.13
13
EN
3.5 DEFINITIONS
14.2
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 (Hr) and offsets (Ho) in feet
H
R
- combined horizontal vent lengths in feet
H
O
- offset factor: .03 (total degrees of offset - 135°*) in feet
V
T
- combined vertical vent lengths in feet
3.6 ELBOW VENT LENGTH VALUES
15.2A
FEET INCHES MILLIMETERS
1° 0.03 0.5 12.7
15° 0.45 6.0 152.4
30° 0.9 11.0 279.4
45°* 1.35 16.0 406.4
90°* 2.7 32.0 812.8
* 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.