EX 24 Full Face Mask

Abstract

Abstract : The requirement for a full face mask with the ability to switch between closed circuit and open circuit modes has evolved from changes in diver mission profiles and enhanced concern for diver safety in the SPECWAR and EOD communities. The EX 24 Full Face Mask (FFM) has been developed to this end. The EX 24 FFM is comprised of an AGA face mask with a switchover block developed by CSS. Included in the EX 24 is a new microphone for diver communication that can be used with existing communication systems onboard SDVs for SPECWAR, or through fiber optic communications/tether line EOD applications. Additionally, the EX 24 incorporates VISTEX, an anti-fogging, scratch-resistant lens film (Film Specialties, Inc., Whitehouse, NJ). The EX 24 was designed as part of the CDS to be used in conjunction with the EX 19 UBA. It can also be used with the MK 16 UBA, on which it was tested in the present series of experiments. The EX 24 allows operation in the closed/open circuit mode without doffing and donning different masks or T-bit mouthpieces. In the open circuit mode, air is supplied by a four foot whip that can interface with the Emergency Breathing System II (EBS II) umbilical, or by SDV boat air accessed by a quick-disconnect. In the closed circuit mode the EX 24 substitutes for the MK 16 T-bit mouthpiece