I'm outfitting a basement room with a wet darkroom. I need to vent air to
the outside of the house the nearest standpipe vent is sink with a 1.5" PVC.
Is that big enough to tie into and vent the air from the adjacent room? Or
do I need a 4" pipe to vent air properly? Thx.
Can't answer the vent pipe question but will say this darkrooms are really
on the way out I work for a large company 100K+ employees and almost the
whole company has gone to digital. Large prints do cost more but you can
bring the files to a lab to be printed!
I would myself go for the larger pipe since you are going to be in the room
with the chemicals!
Wayne, you should cross-post that to Alt.Photography, then stand back
and watch the thread spiral out of control! Some of us enjoy the
hands-on traditions, and can still see more detail in silver grains
than in CCD pixels. We'll see how long it takes for digital prints to
rival the Ansel Adams prints that hang in galleries...
For mundane corporate needs, sure, go digital.
Just stay tuned. I've been predicting for years that as soon as digital
photography has what the politicians can be convinced is resolution
comparable to film that the death of traditional wet chemistry
photography will occur. The hug-a-tree crowd, aided by ignorant
politicians will outlaw it for everyone...but them.
<< do I need a 4" pipe to vent air properly? >>
Depends, 3" is more common for regular plumbing, and many codes require an
increase to 4" where it goes through the roof, as you will note in your own
house. If you are going to vent out the basement wall, larger might be better,
so consider 4" galvanized duct for the smaller hole it needs and the ability to
cap it outside with weather proof fittings. HTH
Not a good idea, if I understand what you are planning.
First 1.5" is not enough for venting the darkroom (air not plumbing that
is) unless you are doing some real high pressure venting. I suggest going
with at least 4". Yea 3" will likely work OK and is used for most
bathrooms, but even the worst bathroom is nothing compared to some of the
stuff used in a darkroom. I have a 3" in mine and I wish it was at least 4"
with a better fan.
The second reason is I doubt if your local plumbing code will allow you
to tie into it for air venting, Even if they did, I would not want to,
unless you like sewer gas in you darkroom or various sewer and chemical
gases in your other rooms.
So bathroom fans are normally vented independently from the air stacks for
the plumbing right? The basement in question is completely below ground
level and under a concrete pad. So if I have to put a separate hole in
things are getting more complicated (read: I need to punch a hole through
the ceiling (floor of my garage) and then out a wall at ground level. But
I'd rather have it done right than have a botched job. Thx.
What you need is the vent outlet that is commonly used for dryers. It
has 4 inch duct connect, and is often installed in basements, has a
damper to keep bugs and animals out.
You can use a bath fan instead of the dryer to move the air. Figure out
how often (times per hour) you want to exchange the air, based on the
volume of the room. You'll probably want to go with metal ducting to
avoid incompatibilities with the chemical fumes and plastic ducting.
Back in the pre-digital days (before 1995) I had a very complete
darkroom in my basement and dryer vent was exactly what I used for
venting. If I remeber correctly I installed two vents and put muffin
fans in each one.
The dampers also kept the "dark" from getting out. :-)
Whoa! If the concentration of acetic acid fumes is that high, he/she
will be in no condition to worry about the life of the fan or blower.
I've worked in rather small areas and often without ventilation and in
no case were the acetic acid fumes high enough to cause destruction of
a fan or metal vent under home darkroom conditions.
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