Your PDF will likely contain a grid showing which planet rules your entrance direction. It will then match that planet with your birth chart. If your entrance is in the North (Mercury) but Mercury is debilitated in your chart, the PDF will prescribe a crystal or specific symbol to activate the door.
An Astro Vastu practitioner uses the birth chart to determine which planets are "afflicted" or "weak" in a person's life and then checks the corresponding directions in the home for Vastu defects. Astro Vastu Pdf