BIDIRECTIONAL AIRFLOW FILTER

摘要

A filtration media that may be mounted in a frame and placed in a central heating, cooling and/or ventilation system. The media has symmetrical characteristics such that, when mounted in the frame, the resulting filter may be mounted with either one major surface of the filtration media receiving the air flow or the opposite major surface receiving the air flow. Regardless of how the filter is oriented, the performance of the filter is the same due to the symmetrical characteristics of the filtration media mounted therein.

主权项

1. A filter having at least gas-permeable filtration media mounted within a rigid frame, the filtration media comprising:
(a) a first layer of filtration media; and (b) a second layer of filtration media laminated to the first layer of filtration media along a central plane, wherein filtration characteristics in the first layer are equivalent to filtration characteristics in the second layer at equal distances from any point on the central plane.