I'm playing with a trial of Chief X8 and ran into something I cannot figure out. I found a bunch of different vents located in the "Core Catalogs; Mechanical, Electrical, Plumbing; Ventilation" section. I can place gable vents, roof vents, foundation vents, etc. but I cannot place the "Attic Vents" (what Chief calls Louvered Gable Peak Vents). Is this a special process or a limit of the trial?