Patent ID: 8584410

Claim:
A window or door system that includes: a window or door system frame adapted to be received within a window or door opening and including an outward extending flange for securement to a building wall and a window or door unit opening defined by planar surfaces of said frame, a window or door unit including at least one sash preassembled to a window or door unit frame slidably received within said planar surfaces of said window or door unit opening of said window or door system frame, wherein either said window or door system frame or said window or door unit frame has an outward opening in said system frame or said unit frame, and a retainer received by interference fit in said opening in either said window or door system frame or said window or door unit frame, said retainer having a portion that extends to engage the other of said window or door system frame and said window or door unit frame and hold said window or door unit on said window or door system frame, wherein said window or door system frame has outward openings on both interior and exterior sides of said window or door system frame, and wherein said retainer is received by snap fit in said outward opening on said interior side and another retainer is received by snap fit in said outward opening on said exterior side to hold said window or door unit within said window or door system frame.