Vent Configurations - ORTAL 44HH Series Installation And Operation Manual

Vent Configurations

The following sections provide information for calculating vent configuration distances and elbows. For vent configurations that cannot
conform to these guidelines, consider Ortal's Power Vent System, or contact Ortal for assistance. Power Vent information can be
found in the Power Vent Installation Manual.
Please consider the following guidelines when determining vent configuration:
Elbows
Maximum Elbows: Up to four 90˚ elbows can be used in the vent configuration. Two 45˚ elbows = one 90˚ elbow.
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45° Vertical Offset Exception:
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They are not counted with other elbows in the vent configuration. This offset exception is applicable immediately on the top
of the fireplace and anywhere else within the vent configuration.
The diagonal run between the two 45° elbows must be included when calculating vertical and horizontal distances.
45° Horizontal Offset:
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to one 90° elbow. Additionally, 3 feet must be reduced from the total allowable horizontal run.
The diagonal run between the two 45° elbows must be included when calculating vertical and horizontal distances
Flat 90° Elbows: For every flat 90° elbow (a 90° elbow that stays in the horizontal plane), 6 feet must be reduced from the total
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allowable horizontal run. Up to two flat elbows are allowed.
Example: If max allowable horizontal run is 24 feet and 1 flat elbow is added, max run is reduced to 18 feet.
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Exceeding two 90° Elbows: For more than two 90° elbows, the minimum total vertical rise is 6 feet.
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3rd 90° Elbow in the Vertical Plane: The 3
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not include flat elbows when determining which 90° elbow in your configuration is 3
Exception: If the 3rd 90° elbow in the vertical plane turns the vent direction from horizontal to vertical, the total allowable
horizontal run does not require a 3-foot reduction.
Diagonal Runs
Calculating Diagonal Runs (D): Diagonal (45°) vent runs have an equal combination of vertical and horizontal aspects. To
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include diagonal portions of your desired vent configuration when determining overall vent limitations, divide the diagonal
distance in half. Add this value to the total vertical rise and total horizontal run distances in your vent configuration. Include these
values when utilizing the Vent Configuration Tables below.
Example: 6 feet diagonal run = 3 feet vertical rise & 3 feet horizontal run
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Other
V Minimum: This is the minimum amount of vertical rise required before the first completely horizontal (not diagonal) run.
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Any vent configuration that does not meet these parameters requires Ortal's review and approval.
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Two 45° elbows in the vertical plane with a diagonal run in between is equal to 0 elbows.
Two 45° elbows that begin and end in the horizontal plane, with a diagonal run in between, is equal
elbow in the vertical plane reduces 3 feet from total allowable horizontal run. Do
rd
rd in the vertical plane.
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