Patent ID: 11933098
Assignee: PELLA CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 24:
25. A fenestration unit having an inner side and an outer side, the fenestration unit configured for installation in a rough opening in a structure defined by rough opening framing, the rough opening having an interior side and an exterior side and the rough opening framing having an interior face and an exterior face opposite the interior face, the fenestration unit comprising:
a frame having a perimeter; and
a retention system coupled to the frame and operable to exert a retention force on the rough opening framing to maintain positive engagement of the fenestration unit with the rough opening framing and resist extraction of the fenestration unit from the rough opening upon insertion of the fenestration unit in the rough opening such that the fenestration unit remains stationary in the rough opening without use of fasteners, wherein the retention system is adjustable to accommodate space between the rough opening framing and the frame,
wherein the retention system includes a retainer configured to permit insertion of the fenestration unit within the rough opening in a first direction at a first insertion force and resist extraction of the fenestration unit from the opening in a second direction at a second extraction force, and
wherein the retainer includes a plurality of flex arms including a first flex arm having a first engagement end and a second flex arm having a second engagement end, the first flex arm being positioned laterally adjacent the second flex arm and the first flex arm being longer than the second flex arm.