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Thread: Ventilation specs for darkroom

  1. #31
    Tin Can's Avatar
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    Re: Ventilation specs for darkroom

    Welcome Wizard of OZ
    sin eater

  2. #32
    Drew Wiley
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    Re: Ventilation specs for darkroom

    Thank you. I have a pair of tinsnips you can borrow if needed.

  3. #33
    Jac@stafford.net's Avatar
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    Re: Ventilation specs for darkroom

    One question concerns how far we need to move the air - is push or pull or a combination of both better and under what circumstances?

  4. #34
    Drew Wiley
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    Re: Ventilation specs for darkroom

    Pulling air is always more efficient than pushing it. An in-line fan somewhere in between, with ducts both directions, is a compromise. But there are also logistical issues. It's fairly easy to locate a high-quality in-line fan in an attic, and it can be set up to service more than one room or duct line. Wall fans have to be shallow to fit inside stud spacings, and sometimes ceiling fans have to too; but these types, if squirrel-cage design, are less expensive than other squirrel-cage options. A more elegant alternative is a weatherized externally-mounted fan or combination of them, which pulls the air as well as isolates noise. More money. I use a large version of one of these, plus a small booster fan connected to a portable fume arm which I can place just above something noxious being mixed, and does not need to be quiet because it's only temporarily used. It's own flexible duct exits into the main fume hood.

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