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Thread: Darkroom Venting

  1. #11
    Vaughn's Avatar
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    Jan 2007
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    Re: Darkroom Venting

    On top of that, if one has the air flow keeping fumes from one's head, any movement of bodies in the room will disturb the air flow -- minor issue.
    "Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China

  2. #12

    Join Date
    Jun 2001
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    North of Chicago
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    1,756

    Re: Darkroom Venting

    I would like to add that dumping warm moist air into a cold attic is not best practice. It is much better to exhaust to the great outdoors so moisture doesn't condense and cause havoc with the building. I'm sure it depends where you live, and that it may be a bit temperature dependent, but it is currently in single digits here and all my vents in the house go outside.
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    Richard Wasserman

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  3. #13

    Re: Darkroom Venting

    HRU Wash Step Dental Clips 2 by Nokton48, on Flickr

    I used a driveway drain glued to PVC pipe and the largest bathroom fan I could find. It does pull odors outside rather well.

    Kodak 3F Basket Line 1 by Nokton48, on Flickr

    Here's the other side of it. My Contractor and also Electrician put this together with my input. It vents out extreme top left.
    Flikr Photos Here: https://www.flickr.com/photos/18134483@N04/

    “The secret of getting ahead is getting started.”
    ― Mark Twain

  4. #14

    Join Date
    Mar 2005
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    Newbury, Vermont
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    2,255

    Re: Darkroom Venting

    Here is my “backdraft” ventilation setup:
    Photo 1 - two runs of 6” flexible heater pipe, running from two 4x12 boxes cut into the sink shelf, and up to a "Y" connector and up to the fan:

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    Photo 2 - individual shutoffs for each run:

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    Photo 3 - Variac transformer, note power level - which is where I typically set this for film and prints. When doing more toxic procedures I turn this up a bit. Full power (like a hurricane!) is hardly needed - but nice to know its there:

    Click image for larger version. 

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    Photo 4 - closeup of fan, purchased at Home Depot. Cannot ascertain/remember model, max CFM’s (quiet and powerful), but cost of fan was about 140.00, Variac (from Amazon) was 50.00, Piping, etc., about another 75.00:

    Click image for larger version. 

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    Finally, this system vents out of a 6" weather head, the hole for which I cut through the band joist/siding.

  5. #15
    Old School Wayne
    Join Date
    Dec 1999
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    1,255

    Re: Darkroom Venting

    Couple of small 4" surplus muffin fans can output 200cfm for $5 each.

  6. #16
    Drew Wiley
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    Sep 2008
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    SF Bay area, CA
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    Re: Darkroom Venting

    Wayne, have you been reading one of those old Popular Mechanics articles telling you how to build your own nuclear submarine using recycled washing machine parts?

  7. #17
    Old School Wayne
    Join Date
    Dec 1999
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    1,255

    Re: Darkroom Venting

    No, but 20 years ago when I set up my darkroom someone mentioned surplus muffin fans for a few pennies a piece and I built my darkroom vent with 2 of them. Works great.

  8. #18
    Drew Wiley
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    Sep 2008
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    Re: Darkroom Venting

    How far are you venting (duct configuration), Wayne?

  9. #19
    Old School Wayne
    Join Date
    Dec 1999
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    1,255

    Re: Darkroom Venting

    My fans are in the window directly behind my sink. No ducting at all, just a light trap

  10. #20
    Drew Wiley
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    Sep 2008
    Location
    SF Bay area, CA
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    Re: Darkroom Venting

    Bingo. Thanks. Nothing remotely related to true 250 extraction, but evidently useful for simpler applications. I had something similar exchanging air in a makeshift film drying cabinet, with nothing other than basic "permanent" coffee filters glued over the intake and outlet ports to prevent dust.

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