An intake air distribution system for removing contamination from an air filter screen includes walls defining an interior space. The intake air distribution system includes an air blower positioned within the interior space of the air filter screen. The air blower includes an inlet positioned to draw air in through the air filter screen and an outlet through which air is exhausted from the blower. A manifold is connected to the outlet of the blower for directing air onto the walls of the air filter screen and out through the air filter screen.