I just noticed that the question: https://meta.stackexchange.com/questions/117107/do-you-also-have-difficulty-reaching-your-rep-quota-during-christmas doesn't appear in the "active" list. If this list were based purely on last modified time, it would be there; so I am assuming that a question will no longer appear in the active questions list at a certain number of downvotes.
Just out of curiosity, is the exact number of downvotes that it takes to kick a question off the active list publicly available or are the details of this functionality purposefully undisclosed?
(or is there another reason that invalidates my initial assumption of it being based on downvotes?)