How to Place a Positive Pressure Air Supply System Space on the Ceiling in Revit
This method allows you to define a space whose volume is constrained between the floor elevation and either the ceiling or the positive pressure air supply system elevation. It is particularly useful when the area above the ceiling is designated as a positive pressure air supply system or has different parameters than the occupied space below.
Begin by opening a floor plan in the Project Browser that includes the area where you want to place the space. Then, create a section view to assist with validation during space placement.
1. Create a Section View
Note: Spaces are not visible in elevation views.
Place the section line on the floor plan so it intersects the area where you intend to place the space. Double-click the section to open the view.
2. Create an Elevation for the Positive Pressure Air Supply System
The positive pressure air supply system requires a specific elevation. A floor plan view based on this elevation can be used to place spaces within the system area above the ceiling.
If your project already includes elevations at ceiling height, select these elevations and set their type to Elevation: Positive Pressure Air Supply System using the type selector. Adjust these standard elevations to match the positive pressure air supply system elevation.
Make sure that a floor plan view based on this elevation exists in the Project Browser.
If such an elevation does not exist, navigate to the Design tab and select Benchmark panel > Elevation. Then, in the type selector, choose Elevation and create a new plan view by clicking Create a Plan View. In the dialog box, select Floor Plan as the plan view type and confirm.
Set the offset to 0′ 0″ (0.00 mm) to add the positive pressure air supply system elevation at ceiling height.
3. Activate Space Visibility
Open the Visibility/Graphics dialog box, go to the Model Categories tab, and locate Space. Expand it and ensure both Internal and Reference are selected. Confirm to apply these settings.
4. Place the Space
With the floor plan view active, go to the Analysis tab and open the Space and Partition panel.
Set the upper limit to the elevation above the designated space, with an offset of 0′ 0″ (0.00 mm). These settings define the vertical extent of the space.
Note: If the specified upper limit and offset exceed the ceiling elevation, the vertical boundary of the space will be constrained to the ceiling. This is because when Area and Volume is selected (default setting), the vertical boundary adheres to room boundary components such as ceilings. This setting can be found under the Design tab > Room and Area panel > Calculation of Area and Volume dialog box.
In the Space dialog, confirm that New is selected if placing a new space, or choose an unplaced space from the list.
Then, move the cursor over the building model area in the floor plan view and click to place the space.
Note: Spaces can only be placed within floor plan views.
Click Modify, select the space, and open Attributes > Energy Analysis. Here, choose whether the space should be marked as occupied and confirm your choice.
Note: If the space overlaps with rooms, the Occupying Space parameter will be automatically selected, marking it as occupied. If it does not overlap with rooms, this parameter will be cleared, marking the space as unoccupied. You can manually adjust this parameter, which affects heating and cooling load analysis.
In the section view, verify that the shaded area representing the space volume is correctly bounded between the floor elevation and the ceiling elevation, with no unshaded areas caused by voids or shafts. This ensures accurate volume calculations.
Keep in mind that unshaded areas corresponding to channels (left side) or wall grooves (bottom right corner) are excluded from the spatial volume.
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