Patent ID: 7320637

Claim:
A filter window adapter unit adapted for use with a main split-sash window of a school bus, said adapter unit comprising: a mounting frame adapted to be installed over the main split-sash window of the school bus and including a top frame member, opposed side frame members, and a bottom frame member all formed integrally together to define an adapter window opening; an outer track portion being formed in said opposed side frame members and extending between said top and bottom frame members; an inner track portion being formed in said opposed side frame members adjacent to said outer track portion and extending between said top and bottom frame members; an inner sash disposed fixedly in a lower position in said inner track portion and carrying a pane of glass; an outer sash disposed movably in said outer track portion and carrying an air filter; said outer sash being raised upwardly so as to cover a main window opening in the school bus when the main split-sash is opened; said air filter being dimensioned with a width and a height so as to cover the main window opening in the school bus; said air filter being formed of an activated carbon filter type which has relative adsorptive ability of diesel fumes; said mounting frame being formed with a plurality of openings which are aligned with corresponding openings in a frame of the main window opening of the school bus for receiving mounting means therethough so as to install said adapter unit over the main split-sash window of the school bus; and said air filter preventing the diesel fumes from the school bus from entering into the interior thereof.