[pure-silver] light tight louvered vents

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
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