Abstract: A vent device for relieving pressure buildup inside an electrical enclosure due to an internal explosion of gases. A mass of stainless steel foam covers an opening in the enclosure and stops any flames or particles from escaping but provides a large equivalent cross section opening to permit the gases to escape and vent the pressure buildup. An outer cover protects the foam mass from impact damage and shields it from high pressure water spray used in cleaning. The cover is vertically hung from a knife-edge and held closed by means of a permanent magnet. A predetermined pressure differential is sufficient to overcome the attractive force of the magnet and allow the protective cover to be pushed open.

Abstract: An improved gas scrubber is provided which is particularly suited for cleaning and cooling the exhaust gases from a diesel powered mine vehicle. The invention is embodied in apparatus including an enclosure which is partially filled with a liquid such as water. An inlet for the exhaust gases is located above the liquid level, as is also an outlet for the cleaned gases to escape. A tube connected to the inlet extends downwardly to below the water level, then changes direction and extends upwardly with constantly increasing cross section and with at least some portion of it in curvature to an open end interiorly of the enclosure and above the liquid level. One or more orifices in the submerged portion of the tube admit water droplets which are sucked into and turbulently mixed with the high velocity gases in proportion to the amount of combustion exhaust from the engine.