A-A-50599
b. Safety. The portable fan shall be provided with fail-safe features that would enhance the safety of personnel while they are operating, maintaining or repairing the fan. When the fan is being operated, maintained, or repaired in accordance with the manufacturers instructions, there shall be no accessible way for the personnel to receive an electric shock. Provisions of National Fire Protection Association 70 (NFPA) for the designated operational environmental shall apply.
c. Size and Weight. The dimensions of the portable fan shall permit it to pass through a circular opening of 21 inches in diameter. The weight of the portable fan shall not exceed 85 pounds.
d. Casing. The casing for the portable fan shall be made cast aluminum or aluminum plate. The casing shall have at least two carrying handles. Two carrying handles shall be along the top of the casing so to allow the fan to be easily transported by two persons. The grip surface of each handle shall be 1 to 1-1/2 inches in width or diameter, and shall be at least six inches in length. All of the handles shall be an integral part of the casing. The portable fan shall have four feet. Each foot shall be located on the bottom of the fan and shall be an integral part of the portable fan casing.
e. Impeller wheel assembly. The impeller wheel shall be of a cast aluminum alloy and shall be securely attached to the motor shaft. The blades of the impeller wheel shall be of an airfoil design. The impeller wheel shall have a strength factor of 8 based on the ultimate tensile strength of its material. Balancing of the impeller wheel shall be accomplished by the removal of material from the wheel. If there is insufficient space between the blades to remove the impeller by the use of an impeller wheel puller, means (such as puller holes) shall be provided in the hub.
f. Safety screens. The portable fan shall have safety screens attached at its intake and exhaust openings. Corrosion Resistant Steel (CRES) screws shall be used to install the screens. Safety screens shall be made of a steel CRES wire and shall conform to Underwriters Laboratory 507.
g. Security seals. The portable fan shall be provided with security seals to prevent the unauthorized repair of the fan and its motor. The security seals shall be in accordance with MIL-S-23769, type 1, crimp/wire type.
h. Preservation. All exposed metal surfaces shall be coated with a thermoset powdered coating using an electrostatic powder technique that conforms to PLASTEC N-18-68. The color of the coating shall be Crimson Red or equivalent.
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