You are here: Home > Support > Knowledge Base > Labeling Ducts and Diffusers in Metric

Labeling Ducts and Diffusers in Metric

Friday, November 1st, 2013

This article explains how to label your ducts and diffusers using metric units. It requires changing a few settings in the Options dialog box.

Ribbon: DMH: Customization->Project Customization-> dm_dm-optionP Options

Pulldown Menu: DM HVAC->Customization->Options->Edit Project List

You must do your design in imperial units. One unit on the drawing should be one inch. All ducts will be sized to even inches. This option will only change the units of the labels.

Ductwork Size Units

Go to the Ductwork section. Find the Rectangular duct label format, Round duct label format, and Oval duct label format options.

There are three different metric conversions you can set: inches to centimeters, inches to millimeters, or inches to soft millimeters. Soft millimeters will convert 1 inch to 25 millimeters.

This article will describe changing to the soft millimeter conversion. If you want one of the other conversion choices, see the Duct Label Format Codes section of the user manual for information on what values to use.

Change the options to the following values:

  • Rectangular duct label format: WMMSxDMMS
  • Round duct label format: DMMS%%C
  • Oval duct label format: WMMSxDMMS%%C

Diffuser Airflow Units

Go to the Diffusers section. Find the Diffuser CFM label format option.

  • Diffuser CFM label format: $LPS

Updating Your Drawings

To update your ductwork sizes, redraw the ductwork.

To update your diffuser labels, run the Coordinate Drawings and Database command.

Ribbon: DM HVAC->Utilities-> dm_dm-util ->Coordinate Drawings and Database

Pulldown Menu: DM HVAC->Utilities->Coordinate Drawings and Database

Related Articles

Filter by
Post Page
HVAC HVAC Drafting Diffusers Ductwork Electrical Electrical Drafting Plumbing Installation, Licensing, and Software Management
Sort by

Duct-Mounted Diffusers

Design Master HVAC does not have a command specifically for inserting or connecting duct-mounted diffusers and grilles. However, you can approximate them by inserting the diffuser close to the duct to which it is mounted.


Stacked Fractions in CAD Labels

You can use in-line formatting to display some Design Master values as stacked fractions when they appear on the drawing.


Working Remotely With Design Master

Here are a few ways you can continue using Design Master collaboratively on projects while working remotely.


Ductwork Double Lines Are Overextended

If double lines are being drawn past where the duct centerline ends, you may need to straighten some of your ducts.


Exporting to IFC and Alignment Points

If your exported IFC file does not line up properly, you may need to adjust your alignment point.


Design Master HVAC Video Tutorial Series

This video tutorial series shows how to perform basic tasks in Design Master HVAC.



Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

System Requirements


Contact Support

Install & Update Instructions

Online Training

Knowledge Base

User Manuals


Release Notes


Wish List

Remote Support



Customer Stories





Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

Free Trial

Electrical for Revit

Electrical for AutoCAD

HVAC for AutoCAD

Photometrics for AutoCAD

8000 Regency Parkway, Suite 585
Cary, NC 27518
[email protected]

©2001-2023, Design Master Software, Inc