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Creating a Custom Diffuser Callout Block

Thursday, April 15th, 2010

Create Callout Block

Open the drawing file that you want to use as the custom diffuser callout. If you do not already have a drawing made for the callout, make the drawing.

Scale the entities in the drawing so that everything is the size it should appear when printed on paper. If you want your text 1/10″ high, it should be 0.1 units high in the drawing. If you want the callout to be 1″ wide, it should be 1.0 units wide in the drawing.

Determine the locations where leaders should connect to this block. If the leader is pointing left, it will start at the location we will call “leader left.” If the leader is pointing right, it will start at the location we will call “leader right.”

Move the leader left point to 0,0.

Create an attribute with a TAG set to WIDTH. This attribute will control the location that a leader pointing right is inserted. Measure the distance between leader left and leader right. Set the PROMPT and DEFAULT values for the attribute to this width.

Use PROPERTIES and set the WIDTH attribute to be invisible. It does not matter where this attribute is located on the drawing.

Use the BASE command and set the base point for the drawing to 0,0.

There are three attributes Design Master HVAC will fill in with information on the drawing, CFM, CALLOUT, and NECK. Your callout can contain these attributes, but none of them are required. Set the TAG, PROMPT, and DEFAULT value to the name of the attribute (either CFM, CALLOUT, or NECK). Set the text style and height on the attribute. These values will not be changed when the callout block is inserted on the drawing.

Save the drawing file as “dm_hvac-diffusercallout.dwg” to your “HVAC Customization” folder.

Using the Block in New Projects

To use the callout block in new projects, go to “DM HVAC->Customization->Options->Edit Standards List.” Set the “Diffuser Callout” option to “Custom Block.”

HVAC Options: Diffuser Callout

Using the Block in Existing Projects

To use the callout block in an existing project, go to “DM HVAC->Customization->Options->Edit Project List.” Set the “Diffuser Callout” option to “Custom Block.”

Use the INSERT command to redefine the block in the drawing. Press “Browse”, and select the drawing from your customization folder. Press OK. You will be asked if you want to redefine the block–answer “Yes” to this prompt. Cancel the insertion after you have redefined the block.

Insert a new diffuser on the drawing and confirm that the callout looks correct. Move the callout using the “Move Callout” command and make sure that the leader is working correctly. Erase this new diffuser if you do not need it in the project.

Run the “DM HVAC->Utilities->Coordinate Drawings and Database” command to update the callouts for diffusers already inserted on the drawing.

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