The present invention provides an air filter [10] for heavy dust conditions, with an efficient scavenging system. The air filter [10] comprising: a housing [20] (Fig. 7), a permeable filter [28], and a scavenger system [30]. The scavenger system disposes of particles collected on the upstream surface of the permeable filter. The scavenger system comprising: an air suction source [24], and a shutter [32]. The shutter is positioned substantially along, typically below, the permeable filter [28], at a certain distance from a wall, typically the bottom wall [34], of the housing [20]. The air suction source draws air from a collecting space [36] located between the shutter [32] and the wall [34] of the housing [20]. According to the invention, the shutter is being selectively operated to permit or restrict passage there-through. The air suction source efficiently operates to scavenge particles from the collecting space [36] when the passage through the shutter is at least partially restricted.
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