Different Kinds of Families

System Families

System families create basic elements that you would assemble on a construction site.

Examples:

Walls, roofs, floors

Walls, roofs, floors

Ducts, pipes

System settings, which affect the project environment and include types for levels, grids, drawing sheets, and viewports, are also system families.

System families are predefined in Revit. You do not load them into your projects from external files, nor do you save them in locations external to the project.

Loadable Families

Loadable families are families used to create the following:

Building components that would usually be purchased, delivered, and installed in and around a building, such as windows, doors, casework, fixtures, furniture, and planting

Building components that would usually be purchased, delivered, and installed in and around a building

System components that would usually be purchased, delivered, and installed in and around a building, such as boilers, water heaters, air handlers, and plumbing fixtures
• Some annotation elements that are routinely customized, such as symbols and title blocks

Because of their highly customizable nature, loadable families are the families that you most commonly create and modify in Revit. Unlike system families, loadable families are created in external RFA files and imported, or loaded, in your projects. For loadable families that contain many types, you can create and use type catalogs, which allow you load only the types that you need for a project.

In-Place Families

In-place elements are unique elements that you create when you need to create a unique component that is specific to the current project. You can create in-place geometry so that it references other project geometry, resizing or adjusting accordingly if the referenced geometry changes. When you create an in-place element, Revit creates a family for the in-place element, which contains a single family type.