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1.7 Head Harness a. The head harness shall be made from EPDM material b. The head harness straps shall be 3/a" wide for greater comfort. c. The head harness shall be ribbed in area of buckle contact to prevent inadvertent slippage or loosening. d. The design of the EPDM head harness shall be such that the head harness design shall resemble a hair net. e. The head harness straps shall be easily removable without the use of tools. f. Optional material hairnet shall be available with 2 or 4 point adjustment. 1.8 Mask Cowling and Communication System a. The facepiece shall include a mask cowling to eliminate the collapse of the facepiece onto the wearer's face in the event of a fall. b. The mask cowling must be easily removed without the need of special tools. c. The mask cowling shall incorporate an integrated voice amplifier communication system. d. The integrated voice amplifier communication system must have a speaker on both the left and right side of the cowling/mask to allow for "surround sound" amplification. 1.9 Other a. The facepiece shall have a provision for using spectacles without breaking the integrity of the facepiece seal or directly attaching to the lens. b. The facepiece shall employ as standard a highly flame retardant neck strap that has an extra button tab to position the facepiece on the wearer's chest to reduce the potential for dirt infiltration when not donned or in use. c. The Facepiece shall have an individual serial number permanently marked on the mask. d. A spectacle kit designed by the SCBA manufacturer for better fit in the facepiece shall be available. e. The spectacle kit shall not mount directly on the lens. f. The Facepiece shall have a device that it may be secured to the firefighter or the SCBA. 2. First Stage Reducer a. The first stage reducer shall be connected directly to the backplate. b. The failure mode of the first stage reducer shall be such that the reducer fails safe and always delivers air to the user. c. The pressure gauge shall be routed over the left shoulder through loops and read in increments of 200 psi for accurate cylinder pressure readings. d. An audible whistle alarm shall be located on the reducer. The warning whistle will alert the wearer when approximately 25% of the service life of the SCBA remains. The alarm shall meet the requirements for respiratory protective devices: self-contained open-circuit compressed air breathing apparatus EN-137 and or NFPA standards for operation during a direct water spray. e. The audible warning shall produce a sound of 90 dBA minimum when measured at 18 inches. f. The warning shall operate when the cylinder pressure is less than or equal to the set pressure for the alarm. 4