Properly ventilating a photo darkroom is very important and the right thing to do. The health of the students and teacher is of utmost importance. Sebastian Darkroom Products full line of fume exhaust vent-hoods became popular when the osha regulations were enacted. Made entirely of PVC plastic, these vent-hoods provide adequate ventilation while featuring a handy over-the-sink shelf for timer and accessories. Vent-hoods are "engineered-to-work"; that is, chemical fumes are drawn into the hood the entire length of the hood with the same capture velocity and away from the breathing-zone of the students.
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Sebastian Fume Exhaust Vent-Hoods