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The filter pocket is just as its name implies: two rectangular sheets of filter medium, placed side-by-side, joined together at three edges, the fourth being open. Pockets are used almost exclusively for air cleaning, in which function they act, literally and metaphorically, as an extension of the panel filters described in Section 3J: several pockets are mounted side-by-side across the front of the panel in such a way that the upstream face of the panel is almost completely filled by the open ends of
the pockets, held open by the way in which they are mounted (as in Figure 3.46 ). The closed ends of the pockets extend out behind the panel into the clean air space. The individual pockets are removable for cleaning or replacement.

A pocket panel has between 4 and 8 pockets mounted across it, giving a high filtration area compared with the face area of the panel. The material of the pocket needs to be somewhat stronger than that of a pleated panel, but a wide variety of
materials can be used, increasingly of synthetic fibre. Multi-layer construction is used a lot, featuring an inner layer (facing the incoming air) with larger pores to capture the coarser particles, a middle layer for fine filtration and a very fine outer
layer to prevent fibre migration from the pocket.

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