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3.2.3
VENT CONFIGURATION
3.2.3.1
LEGEND
- ≤: less than or equal
- ≥: greater than or equal
- <: less than
- >: greater than
- V: vertical rise
- H: horizontal run
3.2.3.2
CONDITIONS THAT MUST ALWAYS BE MET
• Total vent length, including elbows (see 3.2.3.3), must not exceed 40 ft. H + V ≤ 40 ft.
• The first 8 ft. of vent (from the fireplace) must always be covered with the insulating sleeve provided with the
fireplace; no matter the model or configuration type.
• The first 6 in. of vent (from the fireplace) must be vertical.
• The horizontal run, including elbow equivalents (see 3.2.3.3), must not exceed 3 times the vertical rise when it
is greater than or equal to 1.33 ft. (16 in.) and less than or equal to 10 ft.
H ≤ 3xV only if 1.33 ft. (16 in.) ≤ V ≤ 10 ft.
Exception: 6 in. ≤ V ≤ 16 in. H
• Maximum of 4 elbows for the entire exhaust length.
• Minimum of 1 ft. (0.3 m) is required between two vent elbows.
• No vent section should have a downward slope.
3.2.3.3
ELBOW EQUIVALENT FOR HORIZONTAL VENT LENGTH
Elbow angle
1º
15º
30º
45º
90º
Note
: The first elbow has a value of 0 in horizontal vent length. The above table is valid for the 2nd, 3rd, and
1
4th elbows.
CAUTION:
No vent section should slope downwards (from the fireplace to the exterior vent outlet).
= 48 in. (4 ft.)
max.
Horizontal vent length
equivalent (H
)
e
in.
ft.
0.4
0.033
6
0.5
12
1
18
1.5
36
3
34
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