Patent ID: 7765769

Claim:
An insulating unit comprising: a first sheet and a second sheet, each of the sheets having a first major surface and an opposite second major surface; a sash frame having a first sheet supporting surface and a second sheet supporting surface spaced from the first sheet supporting surface and a base between the first and second sheet supporting surfaces, wherein a marginal edge portion of the first major surface of the first sheet is secured to the first sheet supporting surface, and a marginal edge portion of the first major surface of the second sheet is secured to the second sheet supporting surface to position the first and second sheets in spaced relation to one another to provide a compartment between the sheets, the second major surface of the first sheet and the first major surface of the second sheet facing the compartment, wherein marginal edge portions of the second surface of the first sheet facing the compartment are out of contact with the sash frame; a glazing member detachably secure on the sash frame and engaging marginal edge portions of the second major surface of the second sheet to limit movement of the second sheet away from the second sheet supporting surface; a muntin lattice in the compartment, the lattice having end portions adjacent to and spaced from the base of the sash frame; and a muntin retainer clip having a first end portion connected to an end portion of the lattice and the opposite second end portion of the muntin retainer clip having a base made of a compressible material, wherein a periphery of the base is a continuous outer wall, wherein the compressible base of the muntin retainer clip has holes for ease of compressing the base of the muntin retainer clip, the compressible base in surface contact with the second major surface of the first sheet and the first major surface of the second sheet and compressed between the second major surface of the first sheet and the first major surface of the second sheet to retain the muntin lattice in position between the sheets, wherein the base of the muntin retainer clip is compressed by moving the second sheet toward the first sheet and the first end portion of the muntin retainer clip is the end portion of an elongated member extending away from the compressible base, and the first end portion of the elongated member have a plurality of flexible fingers mounted thereon and configured to engage an end portion of the muntin lattice.