Adorama / Doran Heavy Duty Darkroom Light Tight Louvers, 12"x12"
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(12x12") Light-tight, heavy-duty metal louvers that allow fresh air to pass through freely. Most efficient when used with a Darkroom Fan. But one or more may be used to ventilate the darkroom. 12x12" for a room up to 12x14', or 12x24" for a room 12x20'.