12 in. x 24 in. Louver – 900 CFM
$158.95
Exhaust fans can only work in a darkroom equipped with fresh air supply louvers or some other kind of air supply. If there is no air supply to the darkroom the fan will be working against a vacuum and can do nothing. 900 CFM use with 744 series fans.
Pro Lab Air-No-Lite Fan w/Outside Exhaust Wall Cap
$475.95
Pro Lab Air-No-Lite Fan w/Outside Exhaust Wall Cap