MIL-STD-1330D(SH)
20 September 1996
5.1.4 Air filtration.
Type A:
The best commercial practice employing items such as high efficiency particulate air (HEPA) filters shall be used to achieve and maintain a class 100,000 airborne particulate cleanliness level.
Type B:
Outside and recirculated air shall be filtered to remove dust particles. Filter nominal rating shall be less than 10 micrometers.
5.1.5 Ventilation and air pressure.
Class A:
The cleanest room should have a positive pressure of not less than 0.05 inches of water above the ambient pressure. A differential pressure of not less than 0.01 inches of water should exist between any enclosure within the cleanroom and any adjacent area of lesser clean requirements.
Class B:
The ventilation air supply shall maintain a slight positive pressure so that the air flow will always be outward from the clean area.
Class C:
The ventilation air supply shall maintain a slight positive pressure so that the air flow will always be outward from any inhabited area. Fully contained uninhabited areas such as glove bags shall employ ventilation as necessary to prevent the introduction of contaminants.
5.1.6 Personnel clothing.
Class A:
Strict control of personnel and their clothing is required to achieve and maintain a class 100,000 cleanroom. At a minimum, class B requirements shall apply. Additional items such as full coveralls with hoods and booties, anti-static gloves, lint-free paper, and limitations on personnel with skin ailments and colds are generally employed. Refer to MIL-HDBK-407 for guidance in establishing the requisite additional personnel and clothing requirements.
Class B:
(a) Clean undamaged coveralls or smocks, without buttons, exposed zippers, keys, and similar articles shall be worn by all personnel including visitors and observers. Clothing should not be worn
open or worn outside of the cleanroom or controlled area.
(b) Where dirt could be brought in from the outside, shoe covers shall
be worn.
(c) Clean items shall only be handled with clean gloves such as latex,
vinyl, or polyethylene which are free of lint and powder. Gloves
in contact with cleaning solvents or solutions shall be chemically
resistant for personnel safety and to prevent spread of
contamination to oxygen clean surfaces. Oxygen clean surfaces
touched with bare hands shall be considered contaminated.
(d) Special precautions shall be taken in the case of opened piping and
components to prevent the introduction of loose articles such as
buttons, jewelry, pens, coins, glasses, contact lenses, and
hearing aids. Badges, where required to be worn, shall be
securely fastened to the clothing.
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