Delta "T" Systems’ new Head Vent System uses a single powerful blower to extract air from multiple heads on a vessel. It is compact, quiet, highly effective and fully automatic. The entire Head Vent System including the blower, the control unit, and the dampers are housed within a central, remotely-located plenum box. The plenum box measures only 16" L x 12" W x 13" H. A single Head Vent unit is capable of ventilating up to four heads. The system is fully automatic and requires no input from the user. Each head is fitted with a highly sensitive motion detector. When a person enters one of the heads, the system automatically initiates the flow of air from that head. When the person leaves the head, the system remains on for a preset length of time in order to fully ventilate the space, and then shuts down automatically. The Head Vent System is also available in a manual version where the flow of air is started and stopped using a wall-mounted switch within each of the heads. The new Head Vent System runs on 24 volts DC and requires only one exhaust port through to the outside of the vessel.