Combustion quenching fastener caps with holes

A cover, comprising:

• a body comprising an open first end and a closed second end, an inner side and an outer side, and an interior space sized to extend over a fastener;
• and
• a plurality of holes that extend through the body to allow passage of a fluid from the interior space to an exterior environment, each of the holes comprising a first end at the inner side and a second end at the outer side;
• a masking area along the body that is devoid of the plurality of holes, the masking area extending from the open end towards the closed end and with the plurality of holes positioned along lateral sides of the masking area and directly above the masking area between a top of the masking area and the second end of the body;
• an exclusion zone positioned in the interior space at a center of the first end of the body, each of the holes is configured such that a straight line that extends between any point at the first end and any point at the second end does not intersect with the exclusion zone.