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d. The facepiece body shall have a large chin support to locate and support the chin and provide an excellent seal. e. The facepiece shall be available in Ethylene-Propylene-Diene Monomer (EDPM) for maximum protection from chemical and warfare agents. f. With the Lung Demand Valve (LDV) removed and the facepiece donned, the wearer shall be able to breathe freely. g. The pulling force of the head harness shall not be directly applied to the sealing rings to minimise, deformation of the seal and prevent leakage. h. The facepiece body shall have only two openings, lens and front port connector, to minimize the possibility of leakage. 1.2 Nose Cup a. Nose cups shall come in three (3) different sizes, 1, 2, 3, (S, M, L). b. The facepiece shall have a nose cup fitted as standard that reduces CO2 to an average value _ of less than 1% by volume. c. The nose cup shall be easily removed or replaced without the use of tools, for ease of cleaning and disinfecting. 1.3 Lens a. The lens shall meet the scratch resistance test for the latest revision of NFPA 1981 Open- Circuit Self-Contained Breathing. It shall be coated on both sides. b. The thickness of the lens material shall be a minimum of 0.14" for higher impact, flame and radiant heat resistance. c. The effective field of vision shall be greater than 90%. d. T'he facepiece shall be designed so that air from the cylinder passes over the faceepiece lens prior to inhalation to prevent fogging on the inside of the lens. 1.4 Lens Frame a. The lens frame material shall be a non conductive robust composite material for improved lens protection in the event of shock or vibration. b. The lens frame shall be held together by two screws and two nuts for quick and easy lens replacement. _ _ 1.5 Speech Diaphragm a. The mask shall be fitted with a speech diaphragm. b. The speech diaphragm shall be protected from damage to prevent damage or puncturing. In the case of leakage in the area of the speech diaphragm, the mask will maintain positive pressure. 1.6 Exhalation Valve a. The mask shall be fitted with an exhalation valve to isolate the exhalation from the inhalation supply from the regulator. b. The exhalation valve shall be protected by a cover. c. The exhalation valve cover and exhalation valve shall be easily removed without the use of tools for ease of cleaning and decontamination.