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minimum venting requirements
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Simple venting configurations.
For vent configurations requiring more than one 45° and one 90° elbow, the following formulas apply:
Formula 1: H
< 3V
T
T
Formula 2: H
+ V
< 40 feet (12.2m)
T
T
Example:
= 1 FT (0.3m)
V
1
= 1.5 FT (0.5m)
V
2
= V
= 1 FT (0.3m)+ 1.5 FT (0.5m)= 2.5 FT (0.8m)
V
+ V
T
1
2
H
= 6 FT (1.8m)
1
H
= 2 FT (0.6m)
2
H
= H
+ H
= 6FT (1.8m) + 2FT (0.6m) = 8 FT (2.4m)
R
1
2
H
= .03 (one 45° + three 90° elbows - 135°)
O
= .03 (45 + 270 - 135°) = 5.4 FT (1.6m)
H
= H
+ H
= 8FT (2.4m) + 5.4FT (1.6m) = 13.4FT (4.1m)
T
R
O
H
+ V
= 13.4FT (4.1m)+ 2.5FT (0.8m) = 15.9FT (4.8m)
T
T
Formula 1:
H
T
13.4 FT (4.1m) > 7.5 FT (2.3m)
Since this formula is not met, this vent configuration is unacceptable.
Formula 2:
H
T
15.9FT (4.8m) < 40FT (12.2m)
Since only formula 2 is met, this vent configuration in unacceptable and a new fireplace location or vent
configuration will need to be established to satisfy both formulas.
Example:
V
= 1.5 FT (0.5m)
1
= 8 FT (2.4m)
V
2
= V
= 1.5 FT (0.5m) + 8 FT (2.4m) = 9.5 FT (2.9m)
V
+ V
T
1
2
= 1 FT (0.3m)
H
1
= 1 FT (0.3m)
H
2
H
= 10.75 FT (3.3m)
3
H
= H
+ H
+ H
= 1FT(0.3m) + 1FT(0.3m) + 10.75FT(3.3m) = 12.75FT(3.9m)
R
1
2
3
H
= .03 (three 90° elbows + two 45° elbows - 135°)
O
= .03 (270 + 90 - 135°) = 6.75 FT (2.1m)
H
= H
+ H
= 12.75 FT (3.9m) + 6.75 FT (2.1m) = 19.5 FT (5.9m)
T
R
O
H
+ V
= 19.5FT (5.9m) + 9.5FT (2.9m) = 29 FT (8.8m)
T
T
Formula 1:
H
T
19.5 FT (5.9m) < 28.5 (8.7m)
Formula 2:
H
T
29 FT (8.8m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
20
W415-1285 / H / 08.07.18
REQUIRED
VERTICAL RISE
IN FEET
(METERS) V
< 3V
T
3V
= 3FT (0.9m) x 2.5FT(0.8m) = 7.5FT (2.3m)
T
+ V
< 40 FT (12.2m)
T
< 3V
T
= 3 x 9.5 = 28.5 FT (8.7m)
3V
T
+ V
< 40 FT (12.2m)
T
(H
) > (V
)
T
T
See graph to determine the required vertical rise V
required horizontal run H
20 (6.1)
19 (5.8)
10 (3.1)
T
3 (0.9)
0
5
10
(1.5)
(3.1)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS)H
The shaded area within the lines represents acceptable
values for H
45°
H
1
T
.
T
25
15
20
(7.6)
(4.6)
(6.1)
and V
T
T
90°
H
2
V
45°
1
H
1
90°
90°
H
2
H
3
V
45°
1
90°
14.3_2
for the
30
(9.1)
T
V
2
90°
V
2
90°
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