Abstract: A multi-ply expandable filter media formed of obliquely oriented honeycomb organized into a ply or run having expandable honeycomb cells with one run oriented at, preferably an acute angle, of 30.degree. to 60.degree. relative to the cells of an adjacent run. Preferably, the respective plys or runs are arranged in relative parallel planes defining a planar space therebetween. There is provided means for collapsing the filter media into a closed compressed, transportable state, and when ready for use as a filter media, to allow the same to be expanded and pulled open and to be constrained in an preselected, open, expanded position so that the cross-sectional area of each cell is thereby substantially increased. In this manner, the juxtaposed, open plys allow directional change for airflow flowing through the filter media, encouraging deposits of air-borne material to become attached to the wall surfaces of the family of cells of each run or ply.

Abstract: A filter is disclosed which employes two panels of single-faced corrugated paperboard cut into strips or runs, each strip or run glued in an overlaying fashion relative to the one juxtaposed thereto so that the longitudinal axis defined by each corrugation, lies at an angle relative to the plane of the panel of between 45.degree. and 75.degree.. Two such panels are reversingly juxtaposed into an abutting relationship in one embodiment, and against a medial gauze media in another embodiment, to form a novel filter media suitable as a paint arrestor, coating arrestor or the like.