Dorade box

Dorade box Diagram
A cutaway diagram of a Dorade Box. The red arrows show the desired airflow (into the cabin) and the blue arrows show the desired water flow (out of the integral scupper onto the deck). The grey area indicates the deck of the boat.

A dorade box (also called a dorade vent, collector box, cowl vent, or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.