Abstract: This disclosure relates generally to enclosures for HVACR units, particularly enclosures having a plurality of openings allowing airflow through the enclosure. The openings are arrayed with one column or row offset from the adjacent column or row by distances of 10-40% or 60-90% of a length of an opening. The openings may have a major axis in a vertical direction, and columns of openings are offset from one another. The distance that columns or rows are offset from one another may be at or about 30% or 70% of a length of an opening along its major axis. The openings may be extruded openings. The enclosure may be part of an HVACR unit including a spine-fin heat exchanger.