F-F-320C
3.1.3 Type III. For type III units, the ionizing-collecting cells shall serve to build up
concentrations of agglomerated dust particles. The dust particles, after dislodgment from the
plates by the moving airstream, shall be collected by the disposable after-filter. The roll-type
after-filter in style A and style C units shall be located in a filter housing attached directly to the
ionizing-collecting cell enclosure. For style B units, the ionizing-collecting cells shall be nested
between the upper and lower media rolls in a single housing to form a compact unit not greater
than 24 inches (609.6 millimetre (mm)) in depth (front to back).
3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.2.
3.3 Codes and standards. The after-filters shall conform to the requirements of UL 900 for
UL class 1 or UL class 2 filters as applicable. In addition, when specified (see 6.2), filter units
shall conform to the requirements of UL 867.
3.3.1 Certification. Prior to approval of the sample unit submitted for first article inspection, or if
a sample unit is not required under terms of the contract, prior to the first shipment, the supplier
shall submit to the contracting officer or his authorized representative satisfactory evidence that
the after-filters and filter units meet UL requirements. Acceptable evidence of meeting these
requirements shall be the UL listing and marking authorized by Underwriters Laboratories, Inc.,
or a certified test report from a nationally recognized independent testing laboratory, selected by
the supplier and approved by the contracting officer. The report shall state that an after-filter and
filter unit of the same model being furnished under this specification has been examined and tested
and meets the requirements of UL 900 and, when applicable, UL 867.
3.4 Interchangeability. All units of the same classification furnished with similar options under a
specific contract shall be identical to the extent necessary to ensure interchangeability of
component parts, assemblies, accessories, and spare parts.
3.4.1 System of measurement. The dimensions used in this specification are not intended to
preclude the use of the metric system of measurement in the fabrication and production of the
material, individual parts, and finished product, provided form, fit, and function requirements are
satisfied.
3.5 Materials. Materials used shall be free from defects which would adversely affect the
performance or maintainability of individual components or of the overall assembly. Materials not
specified herein shall be of the same quality used for the intended purpose in commercial practice.
Unless otherwise specified herein, all equipment, material, and articles incorporated in the work
covered by this specification are to be new and fabricated using materials produced from
recovered materials to the maximum extent possible without jeopardizing the intended use. The
term "recovered materials" means materials which have been collected or recovered from solid
waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials.
Unless otherwise specified, none of the above shall be interpreted to mean that the use of used or
rebuilt products is allowed under this specification.
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