Rectangular Fish r (CBC)
- Last UpdatedMay 21, 2026
- 2 minute read
The task of creating an HVAC Component is initiated from the HVAC Window.
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Select Branch Connectors in the Categories drop-down list and then RECTANGULAR, Fish r in the Available Type drop-down list to display the Fish Brconnector window:

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You are required to input the following dimensions:
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Fish Width
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Fish Depth
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MAIN Width LA
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MAIN Depth LB
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Fish Length
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Distance from Leave
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B Offset
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Fish Extension
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Fixing to Duct
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Inner Extension
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To visualize how the dimensions equate to the actual piece of HVAC, click Picture to display a detailed drawing for Rectangular Fish (CABC).
Note: The fields will be pre-populated with default dimensions. These dimensions are governed by the details defined in the HVAC Catalogue. The Fish Extension default is auto but can be changed by you to a required dimension. The Fixing to Duct joint default is joint defined in the HVAC Catalogue but can be changed by you to the required joint.
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Click Transpose Width/Depth to exchange Fish Width dimension with Fish Depth dimension or to exchange MAIN Width LA dimension with MAIN Depth LB dimension.
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Specify a type of joint to use for the Fish Joint. Refer to Create/Modify HVAC Component for a detailed description.
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After selecting the type of joint to use for the Fish Joint, you must enter the Fish Direction.
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In Fish Direction specify axis that should be used. Valid axes are E (East), N (North), U (Up), -E (negative East), -N (negative North) or -U (Negative Up).X, Y, Z, -X, -Y or -Z.
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In the Position list, select Connect or Unchanged:
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Click Connect (default when Create is selected) - connects the piece of HVAC to the previous one.
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Click Unchanged (default when Modify is selected) - positions the piece of HVAC at the co-ordinates 0.00.
Note: Unchanged is usually used, when Modify is selected, it does not connect the piece of HVAC but positions it at 0.00, in effect in a floating position.
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Click Defaults to reset all the fields back to when the Fish Brconnector window was opened.
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Click Fit To Next to orientate the Fish Branch Connector to automatically fit this piece of HVAC to the next piece.
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Click OK to create the Fish Branch Connector component and close the Fish Brconnector Window. You will be returned to the HVAC Window.
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Click Cancel to discard all field changes and close the Fish Brconnector window.