Clash detection custom rules

[AIDANJHAWKINS3HJ6V]

I want to create a rule that ignores a certain clash in my model

I am not interested in clashes between false ceilings and mechanical extractors.

Is there a way I can set a rule in clash detection so that they will be ignored

Thanks

[hmunsell · Accepted solution]

Don't make a "Rule", set up Search Sets to find the items you want based on the properties of the element. Then use those Search Sets in your Tests to clash against.  I have about 60 search sets looking for everything from different Wall Types to Security Devices. I use those search Sets in over 90 different Rules clashing different sets, and combinations of sets, against each other.