YAVQ (yet another ventilation question)

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bob - 11 Mar 2004 21:51 GMT

I've read most of the ventilation posts in the previous months. I
understand positive pressure and filtration. I've reviewed all the
literature I could find on the internet.

I have a register hooked up to the central air system that is in the space
where my darkroom will go. What about just putting a filter on that
register (in the floor, between the enlarger and the sink) and turning the
central system to "fan on" (as opposed to "fan auto")?

My room is very small and will require around 100cfm for proper
ventilation.

Would the central air system provide enough ventilation? I have an exhaust
vent that will be ducted over the trays.

Bob

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Silvio Manuel - 11 Mar 2004 22:50 GMT

> I've read most of the ventilation posts in the previous months. I
> understand positive pressure and filtration. I've reviewed all the
[quoted text clipped - 12 lines]
>
> Bob

The question that comes to mind is will anyone else mind breathing
your darkroom fumes? Or maybe I misunderstand.

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Dan Quinn - 12 Mar 2004 10:30 GMT

> The question that comes to mind is will anyone else mind breathing
> your darkroom fumes?

Good point.

> Or maybe I misunderstand.

Or maybe he uses oderless, fumeless chemistry and does not need
a ventilation system to begin with. Dan

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bob - 12 Mar 2004 14:47 GMT

>> I've read most of the ventilation posts in the previous months. I
>> understand positive pressure and filtration. I've reviewed all the
[quoted text clipped - 15 lines]
> The question that comes to mind is will anyone else mind breathing
> your darkroom fumes? Or maybe I misunderstand.

I think you misunderstood.

The HVAC system will draw air from the living room, and pump it into the
various rooms of the house. I wonder if this supply of conditioned air is
sufficient for the number of air changes I need.

The positive pressure in the room will leave through a seperate duct which
goes through the ceiling and exits through the roof (it used to be an
exhaust hood for a kitchen stove).

I wonder if I need additional positive supply (a blower) to pump more air
into the room than the HVAC system will /can.

I also wonder if there are any negative issues concerning using the HVAC
supply this way. I know they are a source of dust, which I why I would need
to put a filter in it. I'm thinking of an electrostatic filter, since they
seem to be more efficient.

Bob

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Silvio Manuel - 12 Mar 2004 15:06 GMT

> I think you misunderstood.
>
[quoted text clipped - 15 lines]
>
> Bob

I would say it will probably work, but I am not a HVAC specialist.

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PSsquare - 12 Mar 2004 22:01 GMT

Does the fan on the HVAC run continuously? If it does, you might get some
steady state balance in air flow. BUT, if it does not, then you will cycle
between two states within the darkroom. That is to say that when the fan is
off there will not be any air feed to keep the room pressure positive, and
then when the fan turns on there will be some sort of balance.

Just a thought.

PSsquare

> >> I've read most of the ventilation posts in the previous months. I
> >> understand positive pressure and filtration. I've reviewed all the
[quoted text clipped - 35 lines]
>
> Bob

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Dan Quinn - 15 Mar 2004 00:05 GMT

> I've read most of the ventilation posts in the previous months. I
> understand positive pressure and filtration. I've reviewed all the
> literature I could find on the internet.

Foot-dragging is what you've been doing. I and many others, some
contributors to this NG, have worked for years in photo labs and
many in more than one, without having ever heard of or even
seen a ventilation system. And I'm talking odor and fume
processing.
I'm suprised there is no response from current odor and fume
processors. After all, it really is'nt all that bad.
After many years away from lab work I set up anew about four
years ago. After bringing in the usuall chemistry I happened
across articles dealing with a more neutral to alkaline, and
by the way, oderless/fumeless, way to process. So I thought,
what the hell, I'll give it a try. After all, no acid stop,
no acid fix, that's quite a change.
My suggestion; drop ALL those air cleaning-ventilation matters
for now and get on with some processing. Odor or no odor. Dan

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