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Airless Spray Gun Filters, Paint Spray Gun Filter, Airless Sprayer Filter One of the primary functions of airless spray gun filters is to remove particles and contaminants from the paint or coating material. These particles can be small debris, dust, or impurities that can clog the spray nozzle orifices. If these particles were to pass through the gun without filtration, they could disrupt the even flow of paint, leading to an uneven and poor-quality finish.