| CPC E06B 3/26 (2013.01) [E06B 1/36 (2013.01); E06B 3/36 (2013.01)] | 8 Claims |

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1. A fenestration unit, comprising:
a sash configured to receive a glazing unit;
a frame including:
a plurality of walls configured to support the sash, a first wall of the plurality of walls including a cover coupling portion having a first cantilevered coupling wall spaced apart from a second cantilevered coupling wall, the first cantilevered coupling wall comprising a keyed rail at an end; and
an access cover defining a first tab opposite a second tab, the first tab configured to releasably engage with the first cantilevered coupling wall and the second tab configured to releasably engage with the second cantilevered coupling wall, the keyed rail configured to engage with a notch defined on the access cover proximate the first tab.
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