Hi Kevin
We have made a minor release that includes changes to the Profile Builder that will address the issues we have discussed. This can be downloaded https://ventsim.com/download/minor-releases/ and selected the VentSim™ Design - Version 5.2.7.1Minor Release
Draw your tunnel profile by selecting the pen button and placing dots on the blank canvas. Alternatively load an image onto the canvas via the image button and dot trace around the image.
Select the center point position from the center point dropdown. Options are middle, top, bottom, left, right. For a ‘half’ profile use left or right
Then click on the Apply button. This will transform the points to a 1:1 aspect ratio and the image will fill the canvas area. The changed image and points will be displayed at this stage. Click close and the profile is ready to use.
As the profile is adjusted to a 1:1 aspect ratio you can set the tunnel Width and Height values and the correct Area will be calculated and tunnel will by drawn in Ventsim at the correct aspect ratio to give a reasonable visual appearance of the profile.
Regards
Don Wallace