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TABLES TO SUBPART J OF PART 84

TABLE 8-AIR-SUPPLY-LINE REQUIREMENTS AND TESTS

(42 CFR part 84, subpart J]

Specific requirements

Length of hose

Air flow

Air flow

.....do

Requirements for the air-supply lines of the indicated type of supplied-air respirators
Type A
Type B

Type C
Maximum of 91 m. (300 Maximum of 23 m. (75 Maximum of 91 m. (300 feet) in multiples of 7.6

feet), in multiples of teet) in multiples of m. (25 feet). It will be permissible for the ap-
7.6 m. (25 feet).
7.6 m. (25 feet).

plicant to supply hose of the approved type of
shorter length than 7.6 m. (25 feet) provided it

meets the requirements of the part.
None
None

The air-supply hose with air regulating valve or

orifice shall permit a flow of not less than 115 liters (4 cubic feet) per minute to tight-fitting and 170 liters (6 cubic feet) per minute to loose-fitting respiratory-inlet coverings through the maximum length of hose for which approval is granted and at the minimum specified air-supply pressure. The maximum flow shall not exceed 425 liters (15 cubic feet) per minute at the maximum specified air-supply pressure with the minimum length of hose for

which approval is granted. ..do

The air-supply hose, detachable coupling, and

demand valve of the demand class or pressure-demand valve of the pressure-demand class for Type C supplied-air respirators, demand and pressure-demand classes, shall be capable of delivering respirable air at a rate of not less than 115 liters (4 cubic feet) per minute to the respiratory-inlet covering at an inhalation resistance not exceeding 50 millimeters (2 inches) of water-column height measured in the respiratory-inlet covering with any combination of air-supply pressure and length of hose within the applicant's specified range of pressure and hose length. The airflow rate and resistance to inhalation shall be measured while the demand or pressure-demand valve is actuated 20 times per minute by a source of intermittent suction. The maximum rate of flow to the respiratory-inlet covering shall not exceed 425 liters (15 cubic feet) per minute under the specified operating conditions.

TABLE 8-AIR-SUPPLY-LINE REQUIREMENTS AND TESTS-Continued

(42 CFR part 84, subpart J]

Specific requirements

Requirements for the air-supply lines of the indicated type of supplied-air respirators
Type A
Type B

Type C

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If an air-regulating valve is provided, it shall be

so designed that it will remain at a specific adjustment, which will not be affected by the ordinary movement of the wearer. The valve must be so constructed that the air supply with the maximum length of hose and at the minimum specified air-supply pressure will not be less than 115 liters (4 cubic feet) of air per minute to tight-fitting and 170 liters (6 cubic feet) of air per minute of loose-fitting respiratory inlet coverings for any adjustment of the valve. If a demand or pressure-demand valve replaces the air-regulating valve, it shall be connected to the air-supply at the maximum air pressure for which approval is sought by means of the minimum length of air-supply hose for which approval is sought. The outlet of the demand or pressure-demand valve shall be connected to a source of intermittent suction so that the demand or pressure-demand valve is actuated approximately 20 times per minute for a total of 100,000 inhalations. To expedite this test, the rate of actuation may be increased if mutually agree able to the applicant and NIOSH. During this test the valve shall function without failure and without excessive wear of the moving parts. The demand or pressure-demand valve shall not be damaged in any way when subjected at the outlet to a pressure or suction of 25 cm. (10 inches) of water gage for 2 min

utes. None.

[blocks in formation]

A 7.6 m. (25 foot) section of the hose will be

placed on a horizontal-plane surface and shaped into a one-loop coil with one end of the hose connected to an airflow meter and the other end of the hose supplied with air at the minimum specified supply pressure. The connection shall be in the plane of the loop. The other end of the hose will be pulled tangentially to the loop and in the plane of the loop until the hose straightens. To meet the requirements of this test the loop shall maintain a uniform near-circular shape and ultimately unfold as a spiral, without any local ized deformation that decreases the flow of air to less than 90 percent of the flow when the hose is tested while remaining in a

straight line. Hose and couplings shall not exhibit any sepaTABLE 8-AIR-SUPPLY-LINE REQUIREMENTS AND TESTS—Continued

ration or failure when tested with a pull of 45 kg. (100 pounds) for 5 minutes and when tested by subjecting them to an internal air pressure of 2 times the maximum respiratorsupply pressure that is specified by the applicant or at 173 kN/m. 2 (25 pounds per square inch) gage, whichever is higher.

Same as Type A

Strength of hose and

couplings.

Hose and couplings

shall not separate or
fail when tested with
a pull of 113 kg. (250
pounds) for 5 minutes.

(42 CFR part 84, subpart J]

Requirements for the air-supply lines of the indicated type of supplied-air respirators
Specific requirements

Type A
Type B

Type C
Tightness
No air leakage shall None

Leakage of air exceeding 50 cc. per minute at occur when the hose

each coupling shall not be permitted when the and couplings are

hose and couplings are joined and are imjoined and the joint(s)

mersed in water, with air flowing through the are immersed in

respirator under a pressure of 173 kN/m. 2 water and subjected

(25 pounds per square inch) gage applied to to an internal air

the inlet end of the air-supply hose, or at pressure of 35 kN/m.

twice the maximum respirator-supply pressure 2 (5 pounds per

that is specified by the applicant, whichever is square inch) gage.

higher. Permeation of hose by The permeation of the Same as for Type A Same as for Type A, except the test period gasoline. hose by gasoline will

shall be 1 hour.
be tested by immers-
ing 7.6 m. (25 feet) of
hose and one cou-
pling in gasoline, with
air flowing through
the hose at the rate
of 8 liters per minute
for 6 hours. The air
from the hose shall
not contain more than
0.01 percent by vol-
ume of gasoline
vapor at the end of

the test. Detachable coupling ...... None

None

A hand-operated detachable coupling by which

the wearer can readily attach or detach the connecting hose shall be provided at a convenient location. This coupling shall be durable, remain connected under all conditions of normal respirator use, and meet the prescribed tests for strength and tightness of hose and couplings.

Subpart K-Non-Powered Air

Puritying Particulate Respirators 884.170 Non-powered air-purifying

particulate respirators; description. (a) Non-powered air-purifying particulate respirators utilize the wearer's negative inhalation pressure to draw the ambient air through the air-purifying filter elements (filters) to remove particulates from the ambient air. They are designed for use piratory protection against atmospheres with particulate contaminants (e.g., dusts, fumes, mists) that are not immediately dangerous to life or health and that contain adequate oxygen to support life.

(b) Non-powered air-purifying particulate respirators are classified into three series, N-, R-, and P-series. The N-series filters are restricted to use in those workplaces free of oil aerosols. The R- and P-series filters are intended

for removal of any particulate that includes oil-based liquid particulates.

(c) Non-powered air-purifying particulate respirators are classified according to the efficiency level of the filter(s) as tested according to the requirements of this part.

(1) N100, R100, and P100 filters shall demonstrate a minimum efficiency level of 99.97 percent.

(2) N99, R99, and P99 filters shall demonstrate a minimum efficiency level of 99 percent.

(3) N95, R95, and P95 filters shall demonstrate a minimum efficiency level of 95 percent.

as

res

$84.171 Non-powered air-purifying

particulate respirators; required

components. (a) Each non-powered air-purifying particulate respirator described

in $84.170 shall, where its design requires, contain the following component parts:

(1) Facepiece, mouthpiece with noseclip, hood, or helmet;

(2) Filter unit;
(3) Harness;
(4) Attached blower; and
(5) Breathing tube.

(b) The components of each non-powered air-purifying particulate respirator shall meet the minimum construction requirements set forth in subpart G of this part.

$ 84.172 Breathing tubes; minimum re

quirements. Flexible breathing tubes used in conjunction with respirators shall be designed and constructed to prevent:

(a) Restriction of free head movement;

(b) Disturbance of the fit of facepieces, mouthpieces, hoods, or helmets;

(c) Interference with the wearer's activities; and

(d) Shutoff of airflow due to kinking, or from chin or arm pressure. 8 84.173 Harnesses; installation and

construction; minimum require

ments. (a) Each respirator shall, where necessary, be equipped with a suitable harness designed and constructed to hold the components of the respirator in position against the wearer's body.

(b) Harnesses shall be designed and constructed to permit easy removal and replacement of respirator parts, and, where applicable, provide for holding a full facepiece in the ready position when not in use.

$84.175 Half-mask facepieces, full

facepieces, hoods, helmets, and mouthpieces; fit; minimum require ments. (a) Half-mask facepieces and full facepieces shall be designed and constructed to fit persons with various facial shapes and sizes either:

(1) By providing more than one facepiece size; or

(2) By providing one facepiece size which will fit varying facial shapes and sizes.

(b) Full facepieces shall provide for optional use of corrective spectacles or lenses, which shall not reduce the respiratory protective qualities of the respirator.

(c) Hoods and helmets shall be designed and constructed to fit persons with various head sizes, provide for the optional use of corrective spectacles or lenses, and insure against any restriction of movement by the wearer.

(d) Mouthpieces shall be equipped with noseclips which are securely attached to the mouthpiece or respirator and provide an airtight seal.

(e) Facepieces, hoods, and helmets shall be designed to prevent eyepiece fogging.

(f) Half-mask facepieces shall not interfere with the fit of common industrial safety corrective spectacles.

884.176 Facepieces, hoods, and hel

mets; eyepieces; minimum require

ments. Facepieces, hoods, and helmets shall be designed and constructed to provide adequate vision which is not distorted by the eyepieces.

8 84.174 Respirator containers; min

imum requirements. (a) Except as provided in paragraph (b) of this section each respirator shall be equipped with a substantial, durable container bearing markings which show the applicant's name, the type of respirator it contains, and all appropriate approval labels.

(b) Containers for single-use respirators may provide for storage of more than one respirator, however, such containers shall be designed and constructed to prevent contamination of respirators which are not removed, and to prevent damage to respirators during transit.

$84.177 Inhalation and exhalation

valves; minimum requirements. (a) Inhalation and exhalation valves shall be protected against distortion.

(b) Inhalation valves shall be designed and constructed and provided where necessary to prevent excessive exhaled air from adversely affecting filters, except where filters are specifically designed to resist moisture.

(c) Exhalation valves shall be: (1) Provided where necessary;

(2) Protected against damage and external influence; and

(3) Designed and constructed to prevent inward leakage of contaminated air.

(7) N95 filters shall be labeled as “N95 Particulate Filter (95% filter efficiency level)" and shall be a color other than magenta.

(8) R95 filters shall be labeled as “R95 Particulate Filter (95% filter efficiency level)" and shall be a color other than magenta.

(9) P95 filters shall be labeled as “P95 Particulate Filter (95% filter efficiency level)" and shall be a color other than magenta.

884.178 Head harnesses; minimum re

quirements. (a) All facepieces shall be equipped with head harnesses designed and constructed to provide adequate tension during use and an even distribution of pressure over the entire area in contact with the face.

(b) Facepiece head harnesses, except those employed on single-use respirators, shall be adjustable and replaceable.

(c) Mouthpieces shall be equipped, where applicable, with adjustable and replaceable harnesses, designed and constructed to hold the mouthpiece in place.

$ 84.179 Non-powered air-purifying

particulate respirators; filter identi.

fication. (a) The respirator manufacturer, as part of the application for certification, shall specify the filter series and the filter efficiency evel (i.e., “N95”, “R95, “P95”, “N99, “R99”, “P99”, “N100”, “R100", or "P100”) for which certification is being sought.

(b) Filters shall be prominently labeled as follows:

(1) N100 filters shall be labeled “N100 Particulate Filter (99.97% filter efficiency level)" and shall be a color other than magenta.

(2) R100 filters shall be labeled “R100 Particulate Filter (99.97% filter efficiency level)" and shall be a color other than magenta.

(3) P100 filters shall be labeled “P100 Particulate Filter (99.97% filter efficiency level)" and shall be color coded magenta.

(4) N99 filters shall be labeled “N99 Particulate Filter (99% filter efficiency level)" and shall be a color other than magenta.

(5) R99 filters shall be labeled “R99 Particulate Filter (99% filter efficiency level)" and shall be a color other than magenta.

(6) P99 filters shall be labeled “P99 Particulate Filter (99% filter efficiency level)" and shall be a color other than magenta.

8 84.180 Airflow resistance tests.

(a) Resistance to airflow will be measured in the facepiece, mouthpiece, hood, or helmet of a particulate respirator (complete respirator) mounted on a test fixture with air flowing at continuous rate of 85+2 liters per minute, before each test conducted in accordance with $ 84.182.

(b) The resistances for particulate respirators upon initial inhalation shall not exceed 35 mm water column height pressure and upon initial exhalation shall not exceed 25 mm water column height pressure. $84.181 Non-powered air-purifying

particulate filter efficiency level de

termination. (a) Twenty filters of each non-powered

air-purifying particulate respirator model shall be tested for filter efficiency against:

(1) A solid sodium chloride particulate aerosol as per this section, if N-series certification is requested by the applicant.

(2) A dioctyl phthalate or equivalent liquid particulate aerosol as per this section, if R-series or P-series certification is requested by the applicant.

(b) Filters including holders and gaskets; when separable, shall be tested for filter efficiency level, as mounted on a test fixture in the manner as used on the respirator.

(c) Prior to filter efficiency testing of 20 N-series filters, the 20 to be tested shall be taken out of their packaging and placed in an environment of 85-5 percent relative humidity at 38+2.5 °C for 25+1 hours. Following the pre-conditioning, filters shall be sealed in a gastight container and tested within 10 hours.

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