Filter pleat pack and air filter unit

Abstract

A filter pleat pack includes an air filter medium including: a first porous fluorine resin membrane; and a first air-permeable supporting layer. The first air-permeable supporting layer is placed on a downstream side in a direction of an air flow that passes through the filter medium with respect to the first porous fluorine resin membrane, and includes a ventilation inhibiting portion in at least one end portion in a width direction, the ventilation inhibiting portion extending along the at least one end portion, the ventilation inhibiting portion inhibiting ventilation in the width direction through the first air-permeable supporting layer. The ventilation inhibiting portion is in contact with the first porous fluorine resin membrane. This filter pleat pack is suitable for reducing a decrease in the collection efficiency of an air filter unit even when a gap between a lateral surface of the pleat pack and a frame is sealed.

Dependencies are inferred from the claim text.