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Photo chemicals are generally not that dangerous but their smells are disagreable when you work during long hours in your lab.
My lab has two ventilations. The first one extracts the air from over the wet section and the second inputs fresh air from the opposite side of the darkroom.
Both use quiet fans producing an air flow of 180m3/h. An air filter inserted in the inlet reduces the dust quantity coming into the darkroom.
The ventilation taking out the air over the wet side. Inlet is identical except the fan is reverted and a filter reduces the incoming dust.
The tube measures 2 meters (6 feet) long and a diameter of 110mm (4.3"), two lines of 15mm (0.6") holes distributes the ventilation over the entire wet side.
Detail of the area close to the fan.
Detail of the end of the tube.