[pure-silver] Re: light tight louvered vents
- From: "K W Hart" <kwhart1@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 18 Feb 2012 10:30:27 -0500
I use the hollow wall (or ceiling) cavities for light-tight ducting: put a
standard louver in one wall high, and another on the other side of the wall in
the same wall cavity low. Since light doesn't bend (much), having the louvers
offset is good enough. And since you would be using standard louvers, your
contractor can pick products he knows will work.
If some of the ceiling joists are sagging, others will likely soon follow.
Sister them all and be done with it! Of course you need to take into
consideration the additional weight load from the new lumber added, so maybe
you should remove/replace all the ceiling joists. Go to HGTV and ask Mike
Holmes!
Ken Hart
kwhart1@xxxxxxxxxxxx
----- Original Message -----
From: Eric Nelson
To: pure-silver@xxxxxxxxxxxxx
Sent: Saturday, February 18, 2012 10:11 AM
Subject: [pure-silver] Re: light tight louvered vents
I have one and it's metal, but I've never installed it. I think it is meant
to be used inside where it would draw fresh air in via a louvered darkroom fan
which can be installed in an outside window or wall. My fan was and there was
some rust after years of hanging outside or from the fumes it removed but it
still worked fine. The electrical and moving parts had not rusted.
There are ways of baffling the light via turns in the ductwork etc, that will
act as a louvered fan for probably less $ and perhaps higher volume of air
moved.
Now if your contractor can weigh in on whether we should sister all our
ceiling joists or just the sagging ones that would be great. ;)
e
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From: shannon Stoney <shannonstoney@xxxxxxxxxxxxxxx>
To: pure-silver@xxxxxxxxxxxxx
Sent: Saturday, February 18, 2012 8:31 AM
Subject: [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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