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YAVQ (yet another ventilation question)
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 -- remove the backwards "SPAM" to reply. |
#2
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YAVQ (yet another ventilation question)
In article ,
bob wrote: 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 The question that comes to mind is will anyone else mind breathing your darkroom fumes? Or maybe I misunderstand. -- If you were to die this evening without being able to communicate with anyone, what would you most regret not having told someone? Why haven't you told them yet? |
#3
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YAVQ (yet another ventilation question)
Silvio Manuel wrote
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 |
#4
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YAVQ (yet another ventilation question)
Silvio Manuel wrote in
: In article , bob wrote: 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 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 -- remove the backwards "SPAM" to reply. |
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YAVQ (yet another ventilation question)
In article ,
bob wrote: 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 I would say it will probably work, but I am not a HVAC specialist. -- Would you like to know the precise date of your own death? What if anything is too serious to be joked about? Do you ever spit or pick your nose in public? |
#6
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YAVQ (yet another ventilation question)
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 "bob" wrote in message ... Silvio Manuel wrote in : In article , bob wrote: 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 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 -- remove the backwards "SPAM" to reply. |
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YAVQ (yet another ventilation question)
bob wrote
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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