MIL-PRF-19004B
3. REQUIREMENTS
3.1 First article.
A sample shall be subjected to first article inspection
(see 6.3).
3.2 Materials. Fan shall be of spark-resistant construction as defined in
AMCA Std 99-0401-86 Type B construction. Cast iron shall not be used in the
construction of the fans nor shall cast iron be used in motors that are
components of type CC fans. Materials shall be corrosion-resistant or material
shall be protected against corrosion after fabrication. Material degraded
during the fabrication process shall be normalized to restore any recoverable
properties before being assembled in any fan. Selected materials shall be
capable of meeting all of the operational and environmental requirements
specified herein.
3.2.1
Composite material.
3.2.1.1 Composite fan casing.
Fan casing shall withstand a full-scale fire
performance test.
3.2.1.2 Fan internal components. Composite material to be used for motor,
vanes, impeller and conduit shall withstand small-scale material specimen fire
tests as outlined in 4.8.2.
3.2.2 Hazardous materials. Materials for use in the construction of fans
shall have no effect on the health of personnel when the materials are used
for their intended purpose. Regardless of other requirements, materials and
parts containing asbestos, cadmium, lithium, mercury, or radioactive material
shall not be used.
3.2.3 Fasteners. Material for all bolts, nuts, studs, screws and similar
fasteners shall be corrosion-resistant passivated or of a material rendered
resistant to corrosion. Sheet metal screws shall not be used. Galling shall
be prevented. Tapped holes shall be reinforced where shearing of thread can
occur.
3.2.4 Nonmagnetic construction. When nonmagnetic fan-motor units are
specified (see 6.2) all fan parts including the casing, vanes, impeller,
impeller bushing, motor mounting, fasteners, washers, conduit box and fittings
shall be of nonmagnetic material. Nonmagnetic material is defined as a
material that has a maximum relative permeability of less than 2.0 after
fabrication.
3.2.5 Motor material. Motor material shall conform to the requirements of
IEEE STD 45 or NEMA MG 1 and 13 as applicable for nonmagnetic motors.
3.2.6 Dissimilar metals.
The fan and components shall not degrade due to
electrolysis (see 6.7).
3.2.7 Recovered materials. Unless otherwise specified herein, all equipment,
material, and articles incorporated in the products covered by this
specification shall be new and may be fabricated using recycled, recovered or
environmentally preferable materials. Recycled, recovered or environmentally
preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs. None of
the above shall be interpreted to mean that the use of used or rebuilt
products is allowed under this specification unless otherwise expressly
stipulated.
3.3
Painting and welding.
3.3.1 Factory coating. Equipment and component items shall be delivered with
the manufacturers standard finish, except as to comply with the requirements
of 3.2.
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