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Duct-Mounted Diffusers

Posted on May 25th, 2023. Last updated on June 13th, 2023.

Q: How do I draft a diffuser or grille that’s mounted on the side of the duct?

A: 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.

  1. Define the duct-mounted diffuser in the Diffuser Project Schedule and set the block to one that approximates how the diffuser will be mounted on the duct.
    • For diffusers mounted on the side of the duct, the Sidewall block is recommended.
    • For diffusers mounted on the top or bottom of the duct, use any other block that resembles how it will look when installed.
  2. Run the Insert Diffuser command and insert the diffuser so that it lines up with the edge of the ductwork.
    • For example, if the duct is 12″ x 12″ and is centered on the duct centerline, insert the diffuser 6″ away from the centerline.
  3. Connect the diffuser to the duct.
  4. Run the Draw Double Line (Branch) or Draw Double Line (Window) command to draw the double lines for the duct and diffuser connection.

You may need to adjust the graphics settings and fittings to make the connection look right.

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


Bring Objects in Front of Ductwork

Use the Move Entity Above/Below Ductwork commands to set whether objects on the drawing should be hidden by ductwork when using the standard CAD HIDE command.


How to Hatch Ductwork

You can display hatches on ductwork using the Layers customization command.


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Depending on whether your floors are on the same drawing or different drawings, you can connect ducts between them by either drawing a transparent duct or using the Insert Drawing to Drawing Connection command.


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You can set your duct and diffuser labels to metric in the customization options.


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When changing the offset in the middle of a duct run, insert a transparent duct so the ductwork will be modeled correctly.