Auto-classing Objects
Certain plug-in objects and symbols have specific default classes, which coordinate with the Layermap worksheet class name standards. The plug-in objects listed here are automatically classed when inserted into a file set up to use auto-classing (when Enable Auto-classing is selected in the Standard Naming dialog box); they are set to default class when inserted if the file has not been set up.
 
Door (2D) - threshold, sidelight sashes and glazing, swing, and leaf

Standards : Auto-classing Objects

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