MIL --- PRF --- 51526B
3.4.6 Dust capacity. The particulate filter shall deliver the rated airflow at a resistance of
no greater than 5.7 inch of water when uniformly loaded with 2 kilograms (4.4 pounds) of dust
per Class A2 of ISO 12103 --- 1.
3.4.7 Overpressure. The particulate filter shall satisfy the minimum efficiency require-
ment of 3.3.2 after being subjected to a repeated overpressure that is produced by an airflow
of 400 scfm.
3.4.8 Flammability. The particulate filter, when clean, shall not produce flame, sparks or
smoke in quantities greater than that allowed for a Class 2 air filter unit per UL 900.
3.5 Ownership and support
3.5.1 Shelf life. Filter shelf life shall be at least 5 years (extendable) (see 6.6). Shelf life is
the maximum time an item may be in sheltered storage within its packaging and still remain
fit for use.
3.5.2 Safety, health, environment.
3.5.2.1 Materials. The materials of construction shall be non --- toxic, non --- hazardous, and
non --- carcinogenic. They shall not be capable of having any adverse effects on human health
during normal use. If special use conditions create a health hazard potential, the equipment
shall have appropriate hazard warning labels in accordance with 29 CFR 1910.1200.
3.5.2.2 Particulate emissions. The filter shall pose no potential inhalation hazard to the
user, and whose normal use will not exceed the lower of (a) 8 --- hour time weighted average
Threshold Limit Values (TLVs) published by the American Conference of Governmental In-
dustrial Hygienists (ACGIH), or (b) 8 --- hour time weighted average Permissible Exposure
Limits (PELs) regulated by Occupational Safety and Health Administration (OSHA) and
found in Material Safety Data Sheets (MSDS).
3.5.2.3 Odors. When air is forced through the filter at 200 scfm, it shall not emit an irritat-
ing level of particulate emissions or obnoxious odors.
3.5.2.4 Hazardous waste. At the time of disposal, uncontaminated filters (including any
coatings) shall not be a Resource Conservation Recovery Act hazardous waste according to
characteristics cited in 40 CFR 261.21 --- 261.24 and shall not be listed as specific hazardous
waste chemicals in 40 CFR 261.33(e) and (f).
3.5.2.5 Sharp edges. Filters shall be free from burrs and sharp edges that might injure
personnel, damage filter media, or damage Mission Oriented Protective Posture (MOPP) IV
gloves during handling.
3.5.3 Identification markings. All markings shall be accessible, legible and permanent.
(a) The filter shall contain markings on the outside surface which include the name "FIL-
TER, PARTICULATE, 200 CFM", contract number, lot number, serial number, national
stock number, cage code, manufacturer's name, and manufacture date. Letters shall be at
least 0.2 inch high.
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