This is what I call a company using its head!
Marine ventilation company Delta T Systems has set a standard for excellence and innovation and following suit, its long-awaited Head Vent System is now in full production. My friends over at the Martin Flory Agency sent me this information and I will be following up with Delta T for a more technical and behind-the-scenes look at what went into its development. But for now, this should be sufficient information for you if you are interested in this kind of equipment.
The 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 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 someone enters one of the heads, the system automatically initiates the flow of air from that head. When leaving, 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. It is simple to install, seamless to operate, and it will add value and true functionality to vessels.
Contact Delta “T” Systems, 858 W 13th Ct., Riviera Beach, FL 33404. 561-204-1500; Fax: 561-848-1611. info@deltatsystems.com; http://www.deltatsystems.com.
Captain Ken Kreisler's Boat and Yacht Report 