By Volume

Sets a limits box to determine the contents of each sheet. The drawlist of any sheet contains just the components of a BRAN or CTMTRL that are needed to fill the limits box. Any further components are added to the next sheet.

If one BRAN or CTMTRL element is physically very large and a drawing is produced of the complete element, the scale is very small compared to a smaller branch resulting in a very complex drawing that is too small to read satisfactorily.

To avoid this potential problem, the BRAN or CTMTRL element must be broken down into smaller pieces, so that they fit into a predefined box. As a result, the majority of drawings are similar in appearance even if not exactly equal in scale.

You are able to determine the size of the limits boxes used to split down the HVAC branches and CWAY material. These limits boxes determine the levels of complexity the user is presented with.

The disadvantage with the limits box is that the content of each drawing cannot be preserved and so any changes in the BRAN or CTMTRL element can affect all existing drawings.