What is an air filter box and where is it located? 1.The air cleaner housing assembly (also commonly referred to as an air box or air filter housing) houses and protects the air filter from the various harsh elements that could potentially weaken and damage it. 2.This allows the air filter to do its job of filtering out any impurities in the air before it flows into the engine. The air box can usually be found near the front of the fender, inside the engine compartment. .
