$84.119 Facepieces; eyepieces; mini- designed and constructed to prevent inmum requirements. ward leakage of contaminated air. $84.121 Head harnesses; minimum re quirements. (a) Facepieces shall be equipped with adjustable and replaceable head har nesses, designed and constructed to provide adequate tension during use and an even distribution of pressure over the entire area in contact with the face. (a) Full facepieces shall be designed and constructed to provide adequate vision which is not distorted by the eye. (b) All eyepieces shall be designed and constructed to be impact and penetration resistant. Federal Specification, Mask, Air Line: and Respirator, Air Filtering, Industrial, GGG-M-125d, October 11, 1965 with interim amendment-1, July 30, 1969, is an example of an appropriate standard for determining impact and penetration resistance. Copies of GGG-M-125d may be obtained from the NIOSH, Certification and Quality Assurance Branch, Willowdale Road, Morgantown, WV place. 26505-2888. 1095 $84.120 Inhalation and exhalation valves; minimum requirements. (a) Inhalation and exhalation valves shall be provided where necessary and protected against damage and distortion. (b) Inhalation valves shall be designed and constructed to prevent excessive exhaled air from adversely af fecting cartridges, canisters, and filters. (c) Exhalation valves shall be protected against external influence, and Type of gas mask (b) Mouthpieces shall be equipped where applicable, with adjustable and replaceable harnesses designed and constructed to hold the mouthpiece in §84.122 Breathing resistance test; minimum requirements. (a) Resistance to airflow will be measured in the facepiece or mouthpiece of a gas mask mounted on a breathing machine both before and after each test conducted in accordance with §§84.124, 84.125, and 84.126, with air flowing at a continuous rate of 85 liters per minute. (b) The maximum allowable resistance requirements for gas masks are as follows: MAXIMUM RESISTANCE Front-mounted or back-mounted (without particulate filter) Front-mounted or back-mounted (with approved particulate filter) Chin-style (without particulate filter) Chin-style (with approved particulate filter) Escape (without particulate filter) Escape (with approved particulate filter) 1 Measured at end of the service life specified in Tables 5, 6, and 7 of this subpart. $84.123 Exhalation valve leakage test. (b) Leakage between the valve and valve seat shall not exceed 30 milliliters per minute. §84.124 Facepiece tests; minimum requirements. (a) The complete gas mask will be fitted to the faces of persons having varying facial shapes and sizes. (b) Where the applicant specifies a facepiece size or sizes for the gas mask, together with the approximate measurements of faces they are designed to fit, the Institute will insure that test subjects suit such facial measurements. (c) Any gas mask parts which must be removed to perform the facepiece or mouthpiece fit test shall be replaceable without special tools and without disturbing the facepiece or mouthpiece fit. (d) The facepiece or mouthpiece fit test, using positive or negative pressure recommended by the applicant and described in his instructions will be used before each test specified in paragraph (e) of this section, and in $84.125. (e)(1) Each wearer will enter a chamber containing 100 p.p.m. isoamyl acetate vapor for a half-mask facepiece and 1,000 p.p.m. isoamyl acetate vapor for a full facepiece or mouthpiece. (2) The facepiece or mouthpiece may be adjusted, if necessary, in the test chamber before starting the tests. (3) Each wearer will remain in the chamber for 8 minutes while performing the following activities: (i) Two minutes, nodding and turning head; (li) Two minutes, calisthenic arm movements; (iii) Two minutes, running in place; and (iv) Two minutes, pumping with a tire pump into a 28 liter (1 cubic foot) container. (4) Each wearer shall not detect the odor of isoamyl acetate during the test. 184.125 Particulate tests; canisters containing particulate filters; minimum requirements. Gas mask canisters containing filters for protection against particulates (e.g. dusts, fumes, mists, and smokes) in combination with gases, vapors, or gases and vapors, shall also comply with the requirements as prescribed in $84.170 through 84.183, except for the airflow resistance test of §84.181. $84.126 Canister bench tests; minimum requirements. (a)(1) Bench tests, except for carbon monoxide tests, will be made on an apparatus that allows the test atmosphere at 50+5 percent relative humidity and room temperature (25+2.5 °C.) to enter the canister continuously at con centrations and rates of flow specified in Tables 5, 6, and 7 of this subpart. (2) Three canisters will be removed from containers and tested as received from the applicant. (3) Two canisters, other than those described in paragraph (a)(2) of this section, will be equilibrated at room temperature by passing 25 percent relative humidity air through them at 64 liters per minute for 6 hours. (4) Two canisters, other than those described in paragraphs (a) (2) and (3) of this section, will be equilibrated at room temperature by passing 85 percent relative humidity air through them at 64 liters per minute for 6 hours. (5) The equilibrated canisters will be resealed, kept in an upright position at room temperature, and tested within 18 hours. (b) Front-mounted and back-mounted gas mask canisters will be tested and shall meet the minimum requirements set forth in Table 5 of this subpart. (c)(1) Front-mounted, and backmounted, and chin-style canisters designated as providing respiratory protection against gases, ammonia, organic vapors, carbon monoxide and particulate contaminants shall have a window or other indicator to warn the gas mask wearer when the canister will no longer satisfactorily remove carbon monoxide from the inhaled air. (2) Other types of front- and backmounted canisters may also be equipped with a window or other indicator to warn of imminent leakage of other gases or vapors. (3) The window indicator canisters will be tested as regular canisters, but shall show a satisfactory indicator change or other warning before the allowable canister penetration has OCcurred. (d) Chin-style gas mask canisters shall meet the minimum requirements set forth in Table 6 of this subpart. (e) Escape gas mask canisters shall meet the minimum requirements set forth in Table 7 of this subpart. TABLES TO SUBPART I OF PART 84 TABLE 5.-CANISTER BENCH TESTS AND REQUIREMENTS FOR FRONT-MOUNTED AND BACK-MOUNTED GAS MASK CANISTERS 1 Minimum life will be determined at the indicated penetration. 2 Relative humidity of test atmosphere will be 95±3pct; temperature of test atmosphere will be 25+2.5° C. Maximum allowable CO penetration will be 385 cm3 during the minimum life. The penetration shall not exceed 500 p/m during this time. Test conditions and requirements will be applicable as shown in this table. Test conditions and requirements will be applicable as shown in this table, except the minimum service lives for acid gas, organic vapor, and ammonia will be 6 min instead of 12 min. TABLE 6-Canister Bench Tests and Requirements for Chin-Style Gas Mask Canisters 88 Combination of 2 or 3 of above types" Combination of all above types Minimum life will be determined at the indicated penetration. 2 Relative humidity of test atmosphere will be 95 ± 3pct; temperature of test atmosphere will be 25 ± 2.5° C. 6,000 3,000 Maximum allowable CO penetration will be 385 cm3 during the minimum life. The penetration shall not exceed 500 p/m during this time. Relative humidity of test atmosphere will be 95 ± 3pct; temperature of test atmosphere entering the test fixture will be 0 ± 2.5° C-0° C. Test conditions and requirements will be applicable as shown in this table. 33 •Test conditions and requirements will be applicable as shown in this table, except the minimum service lives for acid gas, organic vapor, and ammonia will be 6 min instead of 12 min. TABLE 7.-CANISTER BENCH TESTS AND REQUIREMENTS FOR ESCAPE GAS MASK CANISTERS [42 CFR part 84, subpart 1] 1 Minimum life will be determined at the indicated penetration. 2 Relative humidity of test atmosphere will be 95±3pct; temperature of test atmosphere will be 25+2.5° C. Maximum allowable CO penetration will be 385 cm3 during the minimum life. The penetration shall not exceed 500 p/m during this time. If effluent temperature exceeds 100° C during this test, the escape gas mask shall be equipped with an effective heat exchanger. Relative humidity of test atmosphere will be 95±3 pct; temperature of test atmosphere entering the test fixture will be 0±2.5° C-0°C. Subpart J-Supplied-Air 184.120 Supplied-air respirators, description Supplied-air respirators, including all completely assembled respirators designed for use as respiratory protection during entry into and escape from atmospheres not immediately dangerous to life or health are described as follows: (a) Type "A" supplied-air respirators. A hose mask respirator, for entry into and escape from atmospheres not immediately dangerous to life or health, which consists of a motor-driven or hand-operated blower that permits the free entrance of air when the blower is not operating, a strong large-diameter hose having a low resistance to airflow, a harness to which the hose and the life-line are attached and a tight-fitting facepiece. (b) Type "AE" supplied-air respirators. A Type "A" supplied-air respirator equipped with additional devices designed to protect the wearer's head and neck against impact and abrasion from rebounding abrasive material, and with shielding material such as plastic, glass, woven wire, sheet metal, or other suitable material to protect the window(s) of facepieces, hoods, and helmets which do not unduly interfere with the wearer's vision and permit easy access to the external surface of such window(s) for cleaning. (0) Type "B" supplied-air respirators. A hose mask respirator, for entry into and escape from atmospheres not immediately dangerous to life or health, which consists of a strong large-diameter hose with low resistance to airflow through which the user draws inspired air by means of his lungs alone, a harness to which the hose is attached, and a tight-fitting facepiece. (d) Type "BE" supplied-air respirators. A type "B" supplied-air respirator equipped with additional devices dealgned to protect the wearer's head and neck against impact and abrasion from rebounding abrasive material, and with shielding material such as plastic, glass, woven wire, sheet metal, or other suitable material to protect the window(80) of facepieces, hoods, and hel a which do not unduly interfere with the wearer's vision and perm easy access to the external surface such window(s) for cleaning. (e) Type "C" supplied-air respirator An airline respirator, for entry in and escape from atmospheres not in mediately dangerous to life or healt which consists of a source of respirab breathing air, a hose, a detachable co pling, a control valve, orifice, a d mand valve or pressure demand valv an arrangement for attaching the ho to the wearer, and a facepiece, hood, helmet. (f) Type "CE" supplied-air respirator A type "C" supplied-air respirat equipped with additional devices d signed to protect the wearer's head ar neck against impact and abrasion fro rebounding abrasive material, and wit shielding material such as plasti glass, woven wire, sheet metal, other suitable material to protect th window(s) of facepieces, hoods, and hệ mets which do not unduly interfe with the wearer's vision and perm easy access to the external surface such window(s) for cleaning. $84.131 Supplied-air respirators; quired components. (a) Each supplied-air respirator d scribed in §84.130 shall, where its d sign requires, contain the followin component parts: (1) Facepiece, hood, or helmet; (2) Air supply valve, orifice, or de mand or pressure-demand regulator; (3) Hand operated or motor driven ai blower; (4) Air supply hose; (5) Detachable couplings; (6) Flexible breathing tube; and (7) Respirator harness. (b) The component parts of each sup plied-air respirator shall meet the minimum construction requirements set forth in subpart G of this part. $84.132 Breathing tubes; minimum re quirements. Flexible breathing tubes used in conjunction with supplied-air respirators shall be designed and constructed to prevent: (a) Restriction of free head move ment; 38 |