Abstract: A hermetically sealed multiple glazing unit comprises at least one film located between spaced parallel glass panes which are attached to spacing and sealing means constituted by frame portions. The films are attached to the outer frame portions and are stretched when these frame portions are pressed against an intermediate frame portion, by virtue of the profiled confronting surfaces on the frame portions. In another embodiment of the present invention, the multiple glazing unit is not hermetically sealed, and the space between the outer pane and the outermost film is vented through a filter. A silicone coating may be applied to the inner surfaces of the panes and/or to the films to inhibit condensation onto the light-transmitting surfaces. An ultraviolet radiation blocking layer can be provided to protect the film from degradation.