Adorama Darkroom Light Tight Louvers, 8&quot;X8&quot;
Brand: Adorama

(8x8") Light-tight 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'.