Abstract: A detachable pre-filter assembly, an air filter with the detachable pre-filter assembly, and an air-filtration enabled device featuring the air filter with the detachable pre-filter assembly are provided. The air filter includes a perimeter frame that defines a cavity, a filter element disposed within the cavity, and a pre-filter assembly secured to the perimeter frame in a detachable configuration. The pre-filter assembly includes a pre-filter element disposed adjacent to the filter element and a retainer element disposed adjacent to the pre-filter element. The retainer element retains the pre-filter element adjacent to the filter element and engages with the perimeter frame. Thus, the retainer element retains the washable and reusable pre-filter element in place, while allowing removal, installation, and potential re-use of the pre-filter element with ease.