Fenestration unit with panel frame having corner reinforcement plug

A method of manufacturing a fenestration unit comprising:

• providing a corner key of a frame of the fenestration unit;
• engaging the corner key of a frame of the fenestration unit with a first elongate frame member so that the first elongate frame member extends from the corner key in a first direction;
• and
• engaging a second elongate frame member with the corner key so that the second elongate frame member is joined with the first elongate frame member via the corner key, the corner key disposed at a corner of the frame, the second elongate frame member extending from the corner key in a second direction that is different from the first direction, the second elongate frame member including:
• a profile member defining an interior;
• an elongate reinforcement beam disposed within the interior, the elongate reinforcement beam having a terminal end;
• and
• a corner reinforcement plug with an insert end that is received in the terminal end of the elongate reinforcement beam, a corner end that is engaged with the corner key, and an intermediate portion extending along the second direction between the insert end and the corner end, the corner reinforcement plug having a shoulder defined between the intermediate portion and the insert end, the shoulder abutting against the terminal end and the intermediate portion disposed within the interior of the profile member.

A panel for a fenestration unit comprising:

• a central portion;
• and
• a panel frame that extends about the central portion and that supports the central portion, the panel frame including:
• a first elongate frame member extending in a first direction toward a corner of the panel frame;
• a second elongate frame member extending in a second direction that is different from the first direction toward the corner of the panel frame, the projection disposed at a nonzero miter angle relative to the first direction and the second direction;
• and
• a corner key that is disposed at the corner and that is engaged with both the first elongate frame member and the second elongate frame member, the second elongate frame member including:
• a profile member defining an interior;
• an elongate reinforcement beam disposed within the interior, the elongate reinforcement beam having a terminal end;
• and
• a corner reinforcement plug with an insert end that is received in the terminal end of the elongate reinforcement beam, a corner end with an aperture that receives the projection to engage the corner key, and an intermediate portion extending along the second direction between the insert end and the corner end, the corner reinforcement plug having a shoulder defined between the intermediate portion and the insert end, the shoulder abutting against the terminal end, and the intermediate portion disposed within the interior of the profile member.