Nippon Muki Co., Ltd.

Osamu Kitagawa

Shiro Hayashi

Hirokazu Izumiya

A filter pack includes a pleated filter medium and spacing members that maintain a distance between adjacent mountain or valley folded portions of the filter medium. The filter medium includes pairs of extension portions that extend to both sides of folds of the filter medium and face each other when filter medium is folded. The plurality of spacing members include paired spacing members that are respectively provided on the extension portions so as to linearly extend in a direction that is orthogonal to the folds. The paired spacing members are in contact with each other when the filter medium is folded. Surfaces of the paired spacing members that come into contact with each other each include a flat surface that extends in a direction that is orthogonal to a direction in which the spacing members face each other when viewed along an extending direction of the spacing members.

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Yuki, Japan

Osamu Kitagawa