Hi Robeta! Thanks for your reply
About the question #2. Okay, but what if investigator moves a beast using not an elder sign, but something else? For example Ashcan Pete ability in "Fully Revised Scenarios":
Before making an evade test, you may take 1 damage to automatically pass the test and move the monster 1 space.
So im trying to figure out do vents just make two spaces adjacent for a beast and then these spaces works by the basic rules or its some kind of a special game mechanics, granting a beast an ability to "teleport" through it.