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DOE-STD-3020-97
the case. The filter medium support shall be nonflammable.
The panels on the left and right sides of the filter shall be
sealed to the case with adhesive.
Separatorless Filters. Dividers shall be provided as
5.4.2.3
appropriate for additional support. The vertical plane
formed by the ends of the convolutions shall not deviate
more 3/4 in. (19 mm) from the top to bottom of the pleat and
shall be recessed at least 1/16 in. (1.6 mm) from the plane
formed by the four sides of the filter frame. Where
convolutions do not have crest-to-crest contact, spacing
shall not be less than 1/16 in. (1.6 mm). Nesting of
convolutions is not permitted. Abrupt kinks or deviations in
the folds of the medium are not permitted. The trimmed
edges of the filter element shall be firmly potted (fixed) into
the sealant. The two flap edges shall have sufficient
sealant to secure them to the frame sides.
Filter Case. The case shall be fabricated in compliance with the
5.4.3
provisions of Section 5.3.2 of this standard. The completed case,
less gaskets, shall conform to the dimensions listed in Section 5.2.2,
Table 1 of this standard, unless alternative dimensions are specified
in procurement documents. Section 5.4.3, Table 2 of this standard
lists the acceptable tolerances.
13


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