# Centroids of Exterior and Interior walls

**URL:** <https://forum.dynamobim.com/t/centroids-of-exterior-and-interior-walls/35616>\
**Category:** Geometry\
**Tags:** list-filter\
**Created:** [May 6, 2019, 3:56pm UTC](https://forum.dynamobim.com/t/centroids-of-exterior-and-interior-walls/35616 "2019-05-06T15:56:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ferozahmed89](https://avatars.discourse-cdn.com/v4/letter/f/eada6e/32.png) [@ferozahmed89](https://forum.dynamobim.com/u/ferozahmed89)\
**Post date:** [May 6, 2019, 3:56pm UTC](https://forum.dynamobim.com/t/centroids-of-exterior-and-interior-walls/35616/1 "2019-05-06T15:56:02Z")

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Hello,  
Pretty new to Revit and Dynamo. I have a few sample Revit models. I am trying to use Dynamo nodes and extract the centroids of Exterior walls and centroids of Interior walls as two seperate lists. I followed several procedures I found on here from experts, but still unsuccessful. Any help is greatly appreciated.

Thank you.

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**Author:** ![Kulkul](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/kulkul/32/49801_2.png) [@Kulkul](https://forum.dynamobim.com/u/Kulkul)\
**Post date:** [May 6, 2019, 4:10pm UTC](https://forum.dynamobim.com/t/centroids-of-exterior-and-interior-walls/35616/2 "2019-05-06T16:10:17Z")

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Hi @ferozahmed89

Welcome to Dynamo Forum!

This has been discussed previously on forum. You could search on forum search bar you will find many topics:

> [@Get exterior face of a wall](https://forum.dynamobim.com/t/get-exterior-face-of-a-wall/10810/9):
>
> @Hannes Here is another possible way:

> [@Filter internal wall surfaces](https://forum.dynamobim.com/t/filter-internal-wall-surfaces/3826/6):
>
> [Room Faces]