Air filter cartridge for I.C. motors, including a body in which there are defined, in the flow direction of the air to be filtered, an upstream face and a downstream face of the cartridge, wherein the body includes at least one pair of panels of filtering material provided in a substantially V-shaped arrangement, so that at least one channel for the passage of air is define between the panels of the at least one pair of panels, wherein the filtering material of at least one of the panels includes a corrugated sheet of filtering material, wherein, on opposite surfaces thereof, a succession of corrugations and grooves are defined. The invention further concerns the method of manufacturing the cartridge as well as a filter equipped with the cartridge.