Nutone part 84999-000 Glass lens. New Old Stock extremely rare.  This is the replacement lens for the following NuTone Ventilation Fan models: LS100L LS100LF LS80L LS80LF QT100FL QT100L QT100LH QT100LHM QT100LM Dimensions: 11-1/2" W x 5-1/2" H  Maximum Depth: 3" (Approximate Dimensions)