Napoleon Fireplaces Vittoria - GD19 - Manuel (Page 14)

14
W415-1004 / B / 08.10.12
3.7 ELBOW VENT LENGTH VALUES
15.1
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 fi rst 90° offset has a zero value and is shown in the formula as - 90°
3.8 TOP EXIT HORIZONTAL TERMINATION
(H
T
) < (V
T
)
Simple venting configuration (only one 90° elbow) See graph to determine the required vertical rise V
T
for the
required horizontal run H
T
.
0 2.5 5 7.5 10 12.5 15
40
10
20
30
17.5 20
35
REQUIRED
VERTICAL
RISE IN
FEET V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
T
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 35 feet
Example:
V
1
= 3 FT
V
2
= 8 FT
V
T
= 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
< 35 FT
20.9 < 35
Since both formulas are met, this vent configuration is acceptable.
90°
90°
90°
V
1
V
2
H
1
H
2
The shaded area within the lines represents acceptable
values for H
T
and V
T
16.6A