# INP File Modification

**URL:** <https://calculix.discourse.group/t/inp-file-modification/1953>\
**Category:** Uncategorized\
**Created:** [December 6, 2023, 11:58am UTC](https://calculix.discourse.group/t/inp-file-modification/1953 "2023-12-06T11:58:40Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [December 6, 2023, 12:21pm UTC](https://calculix.discourse.group/t/inp-file-modification/1953/2 "2023-12-06T12:21:49Z")

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You need sets for that but also element face labels (as described here: [How to set Heat transfer coefficient value](https://calculix.discourse.group/t/how-to-set-heat-transfer-coefficient-value/1925)). It would be quite tedious to do it manually. That’s what preprocessor do for us. In FreeCAD FEM workbench you can apply heat flux to those faces and edit the input file to see how it’s done.

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