Abstract: A safety release closure suitable for use in a mass transit vehicle which can be rapidly and efficiently removed either inwardly or outwardly in case of an emergency. The closure includes a removable sash that is mounted within a frame opening and secured in place by means of inside and outside deformable seals disposed between the frame and the inside and outside margins of the sash. The perimeter walls of the opening that face the sash are contoured so that the opening is wider across both edges than it is along the middepth region whereby the sash can be easily removed in both directions without it becoming wedged or otherwise jammed in the frame. Means for stripping the seals on both sides of the sash are provided for as are handle means which enable a person to pull the sash out of the frame after the seal has been removed.

Abstract: A multi-glazed window unit of the type wherein parallel panes of a light transmitting material are sealed in a spaced apart relationship and the atmosphere between the sealed panels is treated to remove moisture therefrom. A housing containing a desiccant is positioned between the sealed panes along one outer edge of the unit. The housing is divided into two zones, the first zone being open to the atmosphere so that any moisture present in the atmosphere at the time the unit is sealed is immediately removed therefrom by the desiccant in this zone, and a second zone that is shielded from direct exposure to the atmosphere whereby the desiccant in this zone remains in a condition to remove moisture from the atmosphere which may penetrate the seal at a later time.