Abstract: A pass-through device is provided with one or more sealed connection channels which permit fluid to pass through an environmental protection suit. The device includes an inner housing and an outer housing formed from a flexible PVC with one or more respective inner channels and outer channels configured in each, such that when the inner housing and outer housing are connected, the inner channels and outer channels are sealably connected at a central channel opening to provide sealed conduits through which a fluid or gas passes. The inner housing and outer housing may be connected via a plurality of peripheral retention screws on the inner housing which interface with a plurality of peripheral barrel nuts on the outer housing.

Abstract: A cooling apparatus for a helmet is provided for cooling air in an interior space of a helmet to cool a wearer's head. The cooling apparatus maximizes the volume of air moving across an evaporator and minimizes the speed at which the air passes through cooling fins of the evaporator, thereby achieving air temperatures substantially below the outside ambient temperature. A narrow opening is provided between a first chamber of intake air and a second chamber which houses the evaporator, such that air passing through the narrow opening increases in velocity and pressure. Upon entering the second chamber which is a large open space, the highly pressurized and high velocity air immediately slows down and expands into the large second chamber, where it then passes across a large surface area of the evaporator and outward through a collection chamber and a blower to the inside of the helmet.