Uni Filter entered the air filtration industry in 1969 with a simple concept, “Lets design an air filter that works.” And that’s exactly what we did. We chose polyurethane foam as our air filtration medium, instead of paper or gauze, because of it’s superior dirt capturing capabilities and its capacity to be easily cleaned and reused. And the rest is history. Our original “SOCK” and “POD” air filters took the industry by storm and led to the most comprehensive line of foam air filters in the world!