Revit-or-condition-view-filters-cover

View filters in Revit have always been a very powerful and useful feature with a multitude of uses. Since the 2019 version, Autodesk have improved them even further with the introduction of ‘Or’ conditions, which make the function even more flexible.

In this article we will look at using this improved feature.

As always, filters are only as good as the information input into the project, although at least now with ‘or’ conditions you have more chances for the filter to find the information it needs to act upon. I’ll explain how:

All Filters in Revit work using differences in information within the same category of component, for example Supply and Return diffuser are both Air Terminals, however the data they hold will be different, therefore filters could be used to differentiate between them based on system info, type name etc..

The example we will look at here is fire rated doors, which will allow us to distinguish them visually from non-fire rated doors. The image below shows the fire rated door coloured orange and the others left in the default black. This however is not a fully accurate representation as the door shown here is also meant to be fire rated.

Revit or condition view filters 1

The double door has been selected, and as you can see on the type selector it is supposed to be fire rated, so why did the filter not include this type of door?

Revit or condition view filters 2

The answer is in the type properties, where you can see the fire rating parameter has not been inputted and that it's what the filter is looking for. Ideally the data should have been filled in but this is not always the case.

Revit or condition view filters 3

The image below shows the current filter setting looking for fire rating parameter containing the value of ‘FR60’, whilst the other is looking for ‘FR90’. As we know this will not currently pick up the double door.

Revit or condition view filters 4

This is where the new option of adding an ‘OR’ statement can help. If in the case where some data is missing from a component you wish to filter or it is filled in elsewhere, you can now add more flexibility into the rules by adding a number or ‘OR’ conditions as opposed to the very rigid ‘AND’ conditions. If you’d like to be clever then you can combine AND and OR conditions in one filter 😉.

Revit or condition view filters 5

In this example, I’m going to try and pick up the ‘Fire Rating’ information from other sources; the one we know from earlier is ‘Type Name’, and another option could be ‘Type Comments’. This filter will have a much wider catchment than the previous ones.

Here I’ve added another 2 ‘OR’ statements to the existing one, with all of them looking for ‘FR60’ as the input.

Revit or condition view filters 6

The result of the modified filter is shown above, and as you can see it is now picking up the data from the ‘Type Name’ also.

It goes without saying that any filter works better with consistency in terminology, codes and data input into the project. The extra rules can help with this but being organised is always best.

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