An inlet air filter, also known as an intake air filter, is a component of an engine or an HVAC system that is designed to remove contaminants from incoming air before it enters the system. These filters play a crucial role in maintaining the efficiency and performance of the equipment by preventing dirt, dust, debris, and other particulate matter from entering and potentially causing damage. Inlet air filters must be regularly inspected and replaced to ensure optimal performance and to prevent any potential problems from occurring.