Do you own? Will anyone be needing to be on top of your roof for any reason? Do you have problems with ice in the winter, leaks you've been meaning to have fixed, etc.? Smells can do some crazy things, floating around and what not... it is ALWAYS better to be safe than sorry. :thumbsup:
All it takes is one uptight repairman to notice that it smells like a skunk died in your chimney. Either way, it does sound pretty damn convenient so I hope it works out.

Above + Beyond = Safe :jointsmile:
(if you're a math geek :hippy