Abstract: A window assembly comprises a hollow frame with a trackway mounted upon each frame side including opposed pairs of inner and outer channel tracks of dovetail shape in cross section. Opposed pairs of channel slides of dovetail shape are movably mounted in opposed tracks. A window support bracket overlies each slide and adjacent its lower end is pivotally mounted thereon. Upper and lower sashes are interposed between pairs of opposed support brackets and secured thereto. The upper and lower sashes and connected channel slides are adapted for vertical adjustments along the inner and outer tracks respectively, and the upper and lower sashes and connected support brackets are adapted for selective inward pivotal movement approximately 90.degree. to facilitate cleaning.