# Interference Check
Cut Opening creates openings based on the Interference Check provided by Revit.
Before starting work with “Cut Opening”, select **Collaborate → Interference Check → Run Interference Check**.
On one side, mechanical categories must be selected – Cable Trays, Conduits, Ducts, Pipes, or their fittings.
On the other side, structural categories must be selected – floors, walls, roofs, ceilings, beams, or columns.
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It is possible to select categories from the current and linked projects.
There is no need to select "Insulation" categories, as the Cut Opening will read those automatically.
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In the “Interference Report” dialog, users have to select “Export” and save .html file anywhere on the computer.
