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

Claim 21:
22. 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 sill spacer configured to impose a tilt bias on the fenestration unit toward the exterior side of the rough opening, and
wherein the fenestration unit defines a center of weight, and further wherein the sill spacer is secured to the bottom of the frame to define a contact surface located at an offset position toward the inner side of the fenestration unit relative to the center of weight of the fenestration unit such that when the contact surface rests on the sill portion of the rough opening framing the sill spacer imposes the tilt bias on the fenestration unit toward the exterior side of the rough opening.