I'm building a small outbuilding for my new darkroom. I am planning to use light tight louvered vents that you can buy pre-manufactured, from BH photovideo or Adorama. My contractor is worried that these won't be truly light tight or water proof: he thinks that rain will come through them, or that they might not be really light-tight. I was thinking they could go on the south exterior wall of the building under the eaves, but he thinks they should draw air from a little vestibule where they can be protected from weather. The one I have now IS protected from weather in that way, but I didn't think that it had to be. Does anybody have any experience with whether these plastic vents are truly light tight and water tight when they're on the exterior of a building? Thanks. --shannon============================================================================================================To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.