> For the complete documentation index, see [llms.txt](https://polysphere-studio.gitbook.io/roof-city-pack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://polysphere-studio.gitbook.io/roof-city-pack/blueprints/ventilation-blueprint.md).
# Ventilation Blueprint
To assemble a ventilation system you should use a grid size equal to 5:
Ventilation Example:
Type Parameter:
In the Corner Type, you can set the “Corner Direction” as left, right, up, or down.
The Simple and the Custom Spline type are based on a spline that you can control.
Target Length:
Ventilation Support Posts:
You have different options to add/remove a support post. You can use the following 3 buttons:
Example “Enable All”:
Example: “Enable Only Odd” and “Enable Only Even”:
Or you can select each support post if it will be added:
Materials parameter:
You can overwrite the material if you want, using the “Overwrite Material” parameter.
