Abstract: A gasket construction for mounting a plurality of panes or panel members within a frame comprises a gasket member having a one-piece body, and a desiccant material incorporated in the one-piece body. The gasket body has at least one spacer wall section formed integrally therewith to provide a plurality of continuous peripheral grooves for receiving the panel members in parallel, closely spaced planes with an enclosed space formed therebetween. Means are provided for communicating the desiccant material with the enclosed space or spaces to prevent the generation and presence of condensation on the interior surfaces of the panel members.

Abstract: An exterior window unit is adapted to cover an opening in a building wall. A frame sill of the unit has a mounting fin secured to a fixed sill in the building wall and having a first flange. An adapter sill plate is placed on and secured to the top surface of the fixed sill. The adapter sill plate has at its outer marginal edge a second flange which interfits with the first flange.