mmjp1, I had the same issue years back with renting. Your right, landlords don't like it when you tear up the premises. LOL, anyway, did you consider simply purchasing a really cheap door and cutting a hole in it size of your fan or so? Or even a 6 foot piece of cardboard to use as a wall. Don't have to close your door completely then, then cardboard will keep pets out and let air in. This is just a super cheap way of venting though, but desperate times call for desperate measures correct? Hope this helps...DJ