Extra Inline Equipment Components - Circ Diffuser - Circ Inlet
- Last UpdatedJan 19, 2026
- 2 minute read
The task of creating an HVAC Component is initiated from the HVAC Window.
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Select Extra Plant Equipment in the Categories dropdown list.
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Select Circ Diffuser - Circ Inlet in the Available Type dropdown list to display the Circ Diffuser - Circ Inlet window:

The Circ Diffuser - Circ Inlet window default is a standard stock size, but can be changed by using one of the following methods:
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Standard Stock Sizes
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Non-Standard Stock Sizes (Special)
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Standard Stock Sizes
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In the Name(Ref) field, enter the name of the HVAC component.
Note: The fields will be pre-populated with default dimensions. These dimensions are governed by the details defined in the HVAC Catalog.
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To choose from the standard stock sizes available from the HVAC Catalog, in the Stock Size dropdown list, select the required dimension for the HVAC component.
The ClashVol OUT field will be pre-populated with the obstruction volume associated with the Circ Diffuser - Circ Inlet and the ducting, but can be changed to the required joint.
Non-Standard Stock Sizes (Special)
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To choose to use a non-standard stock piece of HVAC, from the Stock Sizes dropdown list, select Special.
You are required to input the following dimensions:
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Name(Ref)
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Duct Diameter
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Outlet Diameter
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Body Length
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Arrive Extension
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To visualize how the dimensions equate to the actual piece of HVAC, select Picture to display a detailed drawing for Extra Plant Equipment Catalog Element - Circular Diffuser with Circular Inlet.
Note: The fields will be pre-populated with default dimensions. These dimensions are governed by the details defined in the HVAC Catalog.
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Specify a type of joint to use for the Arrjoint (Arrive Joint). For a detailed description, see Create / Modify HVAC Components.
The ClashVol OUT field will be pre-populated with the obstruction volume associated with the Circ Diffuser - Circ Inlet and the ducting, but can be changed to the required joint.
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In the Connect list, select Connect or Unchanged:
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Select Connect (default when Create is selected) - connects the piece of HVAC to the previous one.
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Select 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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Select Defaults to reset all the fields back to when the Circ Diffuser - Circ Inlet window was opened.
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Select Fit to orientate the Circ Diffuser - Circ Inlet to automatically match the outlet (p-leave) of the previous piece of HVAC to the inlet (p-arrive) of the next piece.
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Select OK to create the Circ Diffuser - Circ Inlet component and close the Circ Diffuser - Circ Inlet Window. You will be returned to the HVAC Window.
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Select Cancel to discard all the field changes and close the Circ Diffuser - Circ Inlet window.