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DOE-STD-3020-97
5.4
Filter Construction
Dimensions. The configuration and dimensions of open face
5.4.1
rectangular HEPA filters have been standardized and listed in Section
5.2.2, Table 1 of this standard. All other filter configurations are
considered "special" filters whose dimensions and tolerances must
be specified in the procurement documents. Dimensional tolerances
of "special" HEPA filters should conform to those specified in Section
5.4.3, Table 2 of this standard.
Filter Pack Construction. Filter packs shall be constructed of a
5.4.2
continuous sheet of filter medium which shall be pleated evenly to
form a pack or panel of equal depth throughout. The filter pack shall
be tight when tested according to the method described in Paragraph
8.1 of Institute of Environmental Sciences (IES) Document Number
IES-RP-CC-001.3. Repair of pin holes and other defects is not
acceptable.
Pleat and Separator Filters. Separators shall extend at
5.4.2.1
least 1/8 in. (3 mm) beyond the pleats of filter medium. The
plane formed by the edges of the separators shall be at
least 1/4 in. (6 mm) from the plane of the filter frame (less
gasket). The pleats shall be straight and shall not deviate
more than 1/2 in. (12 mm) from a line drawn from one end
of the pleat to the other end of the pleat and shall be
perpendicular to the filter case.
5.4.2.2
Mini-pleat filters. Filter medium panels shall be sealed in a
reservoir which is at least 1/16 in. (1.6 mm) deep. The
panels shall not vary more than 1/2 in. (12 mm) from a line
drawn from the top to the bottom of the panel and
perpendicular to the case. Filter medium support (ribbons,
strings, etc.) shall not vary more than 1/2 in (12 mm) from a
straight line drawn from top to bottom of the line formed by
the supports and shall be perpendicular to
12


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