Patent ID: 7707779

Claim:
A frame assembly for a window having a vertically sliding sash, the frame assembling comprising: a) an integrally moulded unitary master frame having upper and lower horizontal members and opposed first and second vertical jamb members extending therebetween, and an integral horizontal mullion extending between the first and second vertical jamb members, the mullion spaced apart from the upper and lower horizontal members; b) a respective jamb liner affixed to and extending along each vertical jamb member; and, c) an integrally moulded unitary sash frame coupled to the jamb liner, wherein the first and second vertical jamb members each comprise a liner support structure integrally moulded with the master frame for securing the respective jamb liners thereto in snap-fit, and wherein the liner support structure comprises first and second engagement ribs each extending along generally the height of each respective jamb member, each rib having a rib extend protruding orthogonally towards an interior face of the master frame.