Airfield systems, devices, and methods

A filter for an airfield generator, the filter comprising:

• an elongate body extending from a proximal end to a terminal end opposite the proximal end, the body comprising a polygonal shape having two or more sides, and vertices, the two or more sides extending from the proximal end to the terminal end between the vertices of the polygonal shape, the body further comprising a longitudinal length between the proximal end and the terminal end;
• a first end opening at the proximal end of the body;
• a second end opening at the terminal end of the body;
• one or more filter portions on each side of the two or more sides of the body each of the one or more filter portions comprising an opening in a side of the two or more sides and a filter material in the opening, wherein the one or more filter portions extend along at least a portion of the length of the body;
• and
• wherein the body is configured to draw-in air through the first end opening and through the second end opening and to exhaust the drawn-in air out of the body through the one or more filter portions on each side of the two or more sides of the body, wherein the one or more filter portions are configured to filter the air passing through the one or more filter portions,
• wherein one or more sides of the two or more sides includes two or more filter portions,
• wherein the filter material of each of the one or more filter portions on a first side of the sides of the body comprises a pocket filter configured to expand outward through the opening when air flows through the filter material thereby increasing an effective surface area of the filter material.