Abstract: A spacer frame consisting of a hollow profile strip bent three times and still open at the fourth corner, wherein one leg (2) is longer than the other leg leading to the open corner, is filled with granulated desiccant by way of a probe (20) introduced into the leg (2). The probe (20) extends with its front end (20)into the leg (2') up to the desired filling level. As soon as the desiccant in the leg (2) has reached the probe (20), the feeding flow of desiccant ceases. This is detected by a sensor (27). The sensor (27) actuates the pulling out of the probe (20). During this step, a vacuum is applied to the probe (20) a distance from the front end (201) of the probe via a conduit (40) so that no desiccant can exit from the probe (20).

Abstract: An insulating glass unit comprising a pair of generally parallel, spaced apart glass panes and a spacer-sealant assembly peripherally joining the glass panes to one another and defining with the glass panes a gas-containing interpane space. The spacer comprises a first web whose edges are joined to confronting surfaces of the glass panes by primary sealant strips, the first web and sealant providing a barrier having a permeance to air and interpane gas of not greater than about 0.06 cubic inches/year-inch-arm, and providing a first thermal path having a thermal resistance of not less than about 8 hr-.degree.F.-ft/Btu. The unit is free from peripheral structure providing a separate parallel thermal path having a thermal resistance less than about two and one-half times that of the first thermal path.

Abstract: A substrate having a bead of a moisture and/or gas pervious adhesive having a desiccant therein is shaped to provide U-shaped spacer stock. The spacer stock is bent to provide a spacer frame having continuous corners.

Abstract: A method is provided for making a rigid spacer, containing a silicone bound desiccant which is useful for a multi-pane sealed window. An infrared radiation curable silicone is used as a binder for a desiccant such as a zeolite which is injected in a continuous manner into a U-shaped or V-shaped semi-rigid spacer such as a steel channel.

Abstract: There is described a multiple-pane glazing unit which has top and bottom edges and two side edges and two or more, parallel glazing sheets enclosing a vertical cavity, or cavities. A convective-flow barrier is positioned adjacent to the bottom edge of the glazing sheets within the cavity, or cavities. The barrier is a strip-like member, dimensioned to be in sealing contact, in cold temperature conditions, with both glazing sheets which form a cavity between them. The strip is of a selected material, or of a physical configuration, such that it is flexible of itself or has a flexible edge or edges to accommodate variations in cavity width caused by, say, temperature changes along the length of the barrier. A second similar convective-flow barrier may be positioned adjacent and parallel to the top edge of the unit within the cavity and indeed, intermediate barriers may also be provided between top and bottom barriers and parallel thereto.

Abstract: A glazed wall has an inside glazing and an outside glazing which define a space through which outside air can circulate past the inside glazing for discharge into the room. A low radiation emissivity layer is formed on at least one face of the inside glazing for reducing radiative heat transfer to the outside glazing. This low radiation emissivity layer can also constitute an electrical heating layer for heating the inside glazing.

Abstract: The present invention is directed to a deformable window strip used to separate and seal two panes of glass. More specifically, the deformable window strip of the present invention comprises a flow resistent polymeric matrix which substantially decreases the need for rheological modifiers.

Abstract: A substrate having a bead of a moisture and/or gas pervious adhesive having a desiccant therein is shaped to provide U-shaped spacer stock. The spacer stock is bent to provide a spacer frame having continuous corners.

Abstract: A substrate having a bead of a moisture and/or gas pervious adhesive having a desiccant therein is shaped to provide U-shaped spacer stock. The spacer stock is bent to provide a spacer frame having continuous corners.

Abstract: A motor vehicle pane made from thin insulating glass comprises two thin individual glass panes, which are connected to one another by a spacer frame made from a plastic strand containing a moisture-absorbing means. Along the lower edge area which remains in the door bay, the moisture absorption surface of the plastic strand is enlarged by another plastic strand, which is thinner than the air space between the two panes. Alternatively, the plastic strand can be shaped in a meandering path so as to increase the surface area facing the air space.

Abstract: A spacer frame assembly for an insulating glass panel is disclosed which is constructed by arranging a plurality of spacer frame segments end to end in substantial alignment, with adjacent frame ends being connected together, and supplying sealant to the aligned spacer frame segments substantially continuously along opposite sides. The adjacent frame segments are then pivoted about axes extending transversely to the opposite sides to form a generally planar polygonal frame configuration and the free ends of the frame are joined. A connector for adjacent ends of the spacer frame segments is disclosed which includes first and second body portions secured to first and second frame segments, respectively, and hinge structure connecting the body portions for enabling movement of one frame segment relative to the other. The connector body portions are secured relative to each other by connecting structure with the first frame segment in a predetermined angular position with respect to the second frame segment.

Abstract: A glass refrigerator door structure constructed with two or more glass panels and having a peripheral door frame extending around the sides of the door structure and at the inside of the door without covering the outside glass surface of the door. Sealant is used to bond the glass panels to peripheral spacers separating the panels and to pipe-like structures which extend peripherally around the sides of the door structure. The door frame is connected to the pipe-like structures by a peripheral extension from the frame which engages elongated slots in the pipe-like structures. As such, mechanical fasteners such as nuts, bolts or screws are not needed for the purpose of holding the refrigerator door structure together.

Abstract: An improved insulating spacer assembly for reducing heat transfer between panes of an insulated glazing unit comprises an extruded or roll-formed hollow metal spacer together with thermal breaks and primary sealant. The spacer and thermal breaks are preferably coextruded together, with the thermal breaks being extruded along the upper third portion of the spacer sidewalls, lengthwise along the spacer sidewall. The primary sealant is extruded along the middle third of the spacer sidewalls, parallel to and in cohering relationship to the thermal breaks. The invention also provides insulated glazing units wherein the spacer assembly is sandwiched between two glass panes to provide an exterior channel which is filled with a secondary sealant composition which also covers the exposed edges of the glass panes.

Abstract: A spacer for separating panes of glass in a sealed window unit is formed of a thermosetting resin reinforced longitudinally with continuously extending glass fibres. A layer of a foil material is introduced into the part during the pultrusion process so that the foil is embedded within the part and defines a moisture impermeable layer in the outer wall of the part. The foil can be carried into the part on a layer of paper or polyester which combines with the resin in a bonding action.

Abstract: There is described a multiple pane insulated sealed glazing unit having two or more glazing sheets which are maintained parallel and spaced apart by a resilient spacing and sealing assembly which runs around the periphery of the sheets. An insulating airspace is thus formed between the sheets. The assembly includes an inner spacer sandwiched between the sheets and located inwardly of the glazing edges, creating an outwardly facing perimeter channel. The inner spacer is comprised of a moisture permeable foam material which may be flexible or semi-rigid. The spacer contains desiccant material and has a pressure sensitive adhesive preapplied on two opposite sides adjacent the sheets. The inwardly directed face of the spacer is reistant to ultra-violet radiation and the spacer can be coiled for storage. The assembly also has an outer sealing filling in the channel. In a preferred embodiment the spacer is substantially backed with a flexible vapor and gas barrier coating, sheet or film.

Abstract: There is described a multiple layer sealed glazing unit comprising two or more glazing layers arranged in a parallel spaced apart relation, with an insulating spacer made of oriented thermoplastic polymer material interposed between the separate glazing layers and adjacent to the periphery thereof. The required physical properties of the insulating spacer are substantially governed by controlling the degree and directions or orientation of the molecular structure of the thermoplastic material or materials from which it is formed. Typically, the orientation of the polymer material used to manufacture the insulating spacer is largely in the longitudinal axis of the spacer.There is also described an insulating spacer for multiple layer sealed units.

Abstract: A window for a domestic oven having a reduced thermal transmission so that the external glass surface, which can be touched, is maintained at an acceptable temperature. Between the walls of the window there is an evacuated space. Preferably at least the internal surface of the outer wall is coated with a transparent layer of reflecting material. A non-evaporable getter material is contained within the evacuated space.

Abstract: The invention is a multiglazed window and a spacer element for the window. The spacer element is made in the form of an elongated body member of generally rectangular cross section. This has an elongated interior chamber located along its longitudinal axis. The chamber is partitioned by a flexible diaphragm into two separate chambers. One of these chambers is in communication through longitudinally spaced-apart apertures with the interior volume of the window. The other chamber is in communication through similar apertures with the outside environment. the diaphragm is preferably of S-shaped configuration having a cross sectional length which corresponds to half of the circumference of the interior chamber. As pressure changes occur between the gas within the window and the outside environment the diaphragm will reform to accommodate the resulting volume change. This maintains equal interior and exterior pressures preventing glass deformation.

Abstract: Successive hollow polygonal bodies which are made of a ductile material and each of which has three corners and two straight open-ended terminal portions are converted into rectangular spacer frames for use between the panes of multiple pane windows by orienting the polygonal bodies in such a way that the terminal portions extend downwardly from their open ends, by admitting metered quantities of a flowable desiccant into selected parts of the two terminal portions, by converting one of the terminal portions into an L-shaped frame member with a section which is in register with the other terminal portion, and by inserting sealing plugs into the open ends of the two terminal portions.

Abstract: A window for a domestic oven is described which has a reduced thermal transmission so that the outer glass surface, which can be toughed, is maintained at an acceptable temperature. Between the surface of an outer glass sheet and an inner glass sheet of the window there is a rare gas filled enclosed volume. Preferably at least the inner facing surface of the outer glass sheet is coated with a transparent layer of reflecting material. A non-evaporable getter material is contained within said enclosed volume.

Abstract: The specification discloses an improved insulated glass construction preventing relative slippage beween the hermetically sealed glass sheets. The construction conventionally includes a pair of glass sheets and a spacer frame positioned therebetween and sealed thereto. The spacer frame is recessed from the glass edges. An adhesive fills the recess preferably at discrete locations to bond the glass sheets together.

Abstract: A spacer tube design is arranged to receive a snap-on cap which may be of any desired color thereby to match the surrounding structure. The spacer tube can be bent into a rectangular outline shape without the use of separate corner inserts. The snap-on cap may be capable of holding a deisiccant material. The cap may be also designed as to provide thermal and/or sound insulation between the glazing panels and/or to securely hold a decorative grill or the like in place between the glazing panels. The spacer unit may be capable of flexing in such a manner as to accommodate relative movement between the glazing units in response to fluctuations in the forces acting on the glazing panels thereby to reduce the possibility of damage occurring to the glazing unit.

Abstract: A spacer for use between curved panes of a multiple-pane window in the door or in another part of a motor vehicle has an inverted U-shaped solid section and a straight hollow section with an internal space for a supply of desiccant and with one or more openings establishing communication between such space and the compartment which is surrounded by the frame and is flanked by the panes. The end portions of the solid section have studs which are sealingly received in sockets provided in the corresponding end portions of the hollow section. Portions of the solid section are bent to conform to the curvature of the panes. The cross-sectional outline of the hollow section can match that of the solid section.

Abstract: The invention is a multiglazed window and a spacer element for the window. The spacer element is made in the form of a flexible, resilient elongated body member of generally rectangular cross section. This has an elongated interior chamber located along its longitudinal axis. The chamber is partitioned by a flexible diaphragm into two separate chambers. One of these chambers is in communication through longitudinally spaced-apart apertures with the interior volume of the window. The other chamber is in communication through similar apertures with the outside environment. The diaphragm is preferably of S-shaped configuration having a cross sectional length which corresponds to half of the circumference of the interior chamber. As pressure changes occur between the gas within the window and the outside environment the diaphragm will reform to accommodate the resulting volume change. This maintains equal interior and exterior pressures preventing glass deformation.

Abstract: The invention relates to an improved adsorbent, essentially impermeable to oxygen and nitrogen but permeable to water vapor, and to sealants incorporating said adsorbent. The adsorbent comprises outgassed zeolite having pores with apertures large enough to permit entry of gases such as oxygen and nitrogen into the pore spaces and having on its surface, covering the pore apertures, a fluid which is essentially impermeable to nitrogen and oxygen molecules and yet permeable to water vapor. The zeolite adsorbent, and sealants prepared from the zeolite, are particularly useful in the fabrication of thermal insulating glazed windows having a sealed air pocket.

Abstract: A multiple pane insulated sealed glazing unit having two or more glazing sheets which are maintained parallel and spaced apart by a resilient spacing and sealing assembly which runs around the periphery of the sheets. An insulating airspace is thus formed between the sheets. The assembly includes an inner spacer sandwiched between the sheets and located inwardly of the glazing edges, creating an outwardly facing perimeter channel. The inner spacer is comprised of a moisture permeable foam material which may be flexible or semi-rigid. The spacer contains desiccant material and has a pressure sensitive adhesive preapplied on two opposite sides adjacent the sheets. The inwardly directed face of the spacer is resistant to ultra-violet radiation and the spacer can be coiled for storage. The assembly also has an outer sealing filling in the channel. In a preferred embodiment the spacer is substantially backed with a flexible vapor and gas barrier coating, sheet or film.

Abstract: The invention relates to multiple glazing, a method of obtaining the same and a device for using said method. The glazing contains two sheets of glass separated by a space of dehydrated air and maintained by a cross-braced frame, of which at least the surface in contact with the glass is butyl and/or polyisobutylene rubber-based mastic and is covered with a peripheral injection, which adheres in a cohesive maner to the mastic of the cross-braced frame.

Abstract: The extruded aluminum spacer frame for insertion between the light-transmitting plates of an insulating-glass pane is formed with one or more pairs of transversely extending aligned openings for admission of a gas into the space within the confines of the frame, for evacuation of a gas from such space, or for regulation of the pressure within the space. If the openings are to be sealed, a tough elastic sealing compound is introduced by way of one opening of each pair so as to form in the internal space of the frame a block which sealingly contacts the inner side of the frame all the way around both openings of the respective pair. A plug is thereupon threaded or driven into one of the openings and close to or even into the other opening in order to urge the mass of sealing compound into sealing contact with the frame around both openings as well as to be maintained in sealing contact with the adjacent material of the compound.

Abstract: The present invention relates to a casing with fixed and/or movable frames for doors, windows and the like, which has the peculiarity of comprising a self-supporting frame having a perimetral framework with a closed shape provided with sections of profiled elements having a central body defining, on opposite sides, abutment regions for the fixing of the perimetral region of two spaced apart pane-like elements which provide a double-glazing. The sections of profiled elements, in their central portion, external to the extension of the perimetral framework, have at least portions prearranged for the coupling of means for connecting to a fixed framework.

Abstract: An improved multiple glazed unit including a pair of glass sheets maintained in spaced-apart relationship to each other by a spacer element to provide an airspace therebetween and a sealing element to hermetically seal the airspace, is characterized by a spacer element containing a dehydrating material and an unplasticized polymeric material which is the reaction product of a polyisocyanate and an active hydrogen containing material; and a sealing element containing an unplasticized polymeric material which is the reaction product of a polyisocyanate and an active hydrogen containing material; the polymeric material of the spacer element having a moisture vapor transmission rating which is greater than that of the polymeric material of the sealing element.

Abstract: A method is described wherein at least one opening (6) is produced in a wall (2) of a hollow molding (1), with the formation of a shoulder (9) surrounding the opening (6) and projecting into the interior (8) of the hollow molding (1). A plug (12) of a sealing compound (11) is produced for sealing the opening (6), or the opening (6) in the wall (2) and a further opening (7) in the opposite wall (3) of the hollow molding (1), this plug being securely retained in the interior (8) of the hollow molding (1) by the feature that the plug extends into the space (16) defined by the shoulder (9) and rests on the inner surface (13) of the opposite wall (3) of the hollow molding (1).

Abstract: Prismatic plates are float-mounted between glass panes of a composite window by means of a spacer which is attached to the inside of a bridge which connects the glass panes. This attachment comprises a dove-tailed groove and a prismatic component which fits into the groove. This connection allows the components to be displaced in the event of thermal expansion and also permits easy assembly.

Abstract: The invention relates to an improved adsorbent, essentially impermeable to oxygen and nitrogen but permeable to water vapor, and to sealants incorporating said adsorbent. The adsorbent comprises outgassed zeolite having pores with apertures large enough to permit entry of gases such as oxygen and nitrogen into the pore spaces and having on its surface, covering the pore apertures, a fluid which is essentially impermeable to nitrogen and oxygen molecules and yet permeable to water vapor. The zeolite adsorbent, and sealants prepared from the zeolite, are particularly useful in the fabrication of thermal insulating glazed windows having a sealed air pocket.

Abstract: Elbows in tubular blanks which are filled with a desiccant are formed by clamping a blank at one side of the intended locus of the elbow, by bending the blank at the other side of the intended locus of the elbow relative to the clamped portion of the blank, by propping the blank in the region of the inner wall of the developing elbow, and by plasticizing the material of the blank in the region of the outer wall of the developing elbow so that the material of such outer wall is less likely to exhibit cracks and/or to burst as a result of bending of the blank.

Abstract: The invention relates to a profile spacing element for mounting of a second glass (2) in a window frame (1) said spacing element serves as a spacer between the glasses. The space between the glasses and the spacing element is sealed. The spacing element (6,15) preferably consists of a non-rigid material which is provided with a diffusion tight covering (9). The covering extends along the entire length of the spacing element and covers its sides (7,8,10) which face towards the glasses (2,5) and the window frame (1). The covering perfects the sealing contact between the spacing element and the glasses and window frame. The diffusion tight material (9) consists of an elastic or resilient material. Further the spacing element preferably is formed as a hollow profile filled with a drying agent and having longitudinally extending deformation notches (11,12) making it possible to bend the spacing element at the corner areas of the window frame without pressing the glasses apart from each other.

Abstract: An improved bedding composition for use in sealing insulating glass units to frames, mullions, or the like is provided. The bedding composition includes a polar solvent, a plasticizer, and an elastomer and is compatible with available insulating glass sealant compositions including hot melt adhesives.

Abstract: An elongated spacer is disclosed for use in separating the glass panes in multiple-glazed thermal windows. The spacer has an elongated hollow interior for storing a dessicant material and a plurality of moisture barrier partitions at intervals along the length of the interior. The spacers are originally manufactured in oversized lengths and later cut to fit particular windows. The partitions divide the elongated interior into subcompartments, and when the spacer is cut to length the partitions confine moisture contamination and dessicant loss to the particular subcompartment which is cut.

Abstract: A multiple pane glass assembly having at least one pane that is electrically heatable. The glass panes of the assembly are disposed in closely spaced, side-by-side relation with a spacer interposed between adjacent panes. The spacers include a plurality of hollow tubular members disposed near the peripheral edges of the panes with adjacent ends of the tubular members connected by corner key elements. Electrical lead wires extending from an interior electrically heatable surface of one of the panes are directed through respective apertures or passageways in the corner key elements, into the end of a respective tubular member connected to the corner key element, and through the tubular spacer members to a common egress location. The corner key elements are adapted to retain desiccant material in at least some of the tubular members, which together with sealant applied about the periphery of the assembly, enables an air-tight sustantially vapor-free condition to be maintained in the space between panes.

Abstract: A window spacer assembly is disclosed having tubular members interconnected by corner pieces. The corner pieces are provided with flexible fingers which create an interference fit with the tubular member ends and resist forces which tend to pull the assembly apart.

Abstract: A spacer bar for use in double glazed windows is disclosed. The spacer bar is an elongated tube or conduit having a generally rectangular cross section. The spacer bar has two pairs of opposing planar faces. Each planar surface of one pair lies against the interior surface of one of the glass panes of the double glazed window and one planar surface of the other pair faces the space between the panes and the other planar surface of said other pair faces the atmosphere. A small diameter tube passes through the surface facing the atmosphere. The portions of the small diameter tube lying on either side of the conduit surface are bent downwardly. The portion of the small diameter tube which lies inside the conduit is bent downwardly and extends to a point at least 5 inches below its entry point and the other portion of the small diameter tube which lies outside the conduit is also bent downwardly so that it lies adjacent to and generally parallel to the outer face of the conduit.

Abstract: A multi-windowpane structure for use in a temperature controlled environment such as a refrigerator or freezer with a display chamber. The window comprises two parallel glass panes which are separated from one another by a spacer disposed along their edges. The spacer is formed of transparent resinous material and contains a drying element. Therefore, high visibility of the merchandise on display is achieved. Since the spacer is formed of a resinous material, its rate of heat transfer is very low. Thus, the formation of condensation along the inner surfaces of the glass panes is greatly reduced.

Abstract: A window or door assembly has spaced apart glass panes perimetrally sealed in sash members which include one or more breathing passages extending from a groove in the outer face of the sash through to the space between the panes. An elongate flat plate, with fine perforations, has perpendicularly extending, reduced width parallel end flanges configured to pilot into and seal off the groove on opposite sides of a passage, to provide an air circulation manifold under the plate. Preferably the plate is nailed in place.

Abstract: A corner piece for connecting adjacent hollow spacer members to form a spacer frame used in the construction of thermally insulated windows. The corner piece includes horizontal and vertical legs forming a right angle. One end of each leg has a cutting edge. When the ends of each leg are inserted into a hollow spacer which has internal partitions, the sharpened cutting edge is able to cut around the adjacent partition and thus enter the spacer fully. The corner piece is constructed in a manner which permits sealant to be injected into the corner pieces and the spacers after assembly to seal off any gaps around the installed corner piece.

Abstract: A multiple pane unit comprising a pair of sheets maintained in parallel, spaced-apart relationship to each other by a spacing and sealing assembly defining a substantially hermetically sealed, insulating airspace between the sheets. The spacing and sealing assembly includes inner and outer elements. The outer element is adhered to the marginal periphery of the inner, facing surfaces of the sheets. The inner element is self-adhered to the marginal periphery of the inner, facing surfaces of the sheets in communication with the airspace and in juxtaposition to the outer element. Both the inner and outer elements have at least minimum adhesive structural bonding strength. The inner element preferably comprises a moisture vapor transmittable matrix material having a desiccant material dispersed therein, thereby ensuring communication between the desiccant and the airspace sufficient to maintain dryness of the airspace.

Abstract: According to the invention there are produced sodium Zeolite A granulates having the following parameters:______________________________________ Adsorption Data: (p/po = 0.8, 20.degree. C.) ______________________________________ H.sub.2 O > 22.0% NH.sub.3 > 11.0% CO.sub.2 .ltoreq. 0.1% O.sub.2 .ltoreq. 0.1% N.sub.2 .ltoreq. 0.1% Ar .ltoreq. 0.1% CH.sub.3 OH .ltoreq. 0.2% CH.sub.3 --CH.sub.2 --OH .ltoreq. 0.2% ______________________________________The zeolite granulate is produced by having zeolite A powder present in a mixer, adding alkali silicate solution, mixing until there are obtained zeolite granulates having a particle size of at least 0.1 mm, in a given case post-rolling the granulates, first drying the moist zeolite granulates with air in a fluidized bed drier at a temperature of 20.degree. to 39.degree. C., during which the carbon dioxide content of the drying air is adjusted to less than 200 ppm, subsequently drying in a second drying step at a temperature of 40.degree.-120.degree. C.

Abstract: An element for doors or windows, which has panels spaced by a spacer forming a gas filled chamber therebetween, includes an automatically variable volume placed within the chamber; the automatically variable volume is formed by a peripheral spacer and a deformable flexible membrane integral with the spacer.

Abstract: A glazing consisting of two panes located opposite one another and retained by a rigid frame provided with leakproofing means and consisting of sections which bear on the inner faces of the panes and which are fastened to these by means of an anchor preventing the panes from moving apart, this frame being provided with at least one deformable and leakproof member for equalizing pressure between the outside and inside of the glazing, this member being independent of the said leakproofing means and being located on the inside of the glazing in relation to the said sections, and the said sections having, towards the outside of the glazing, a shape which allows direct attachment of accessories enabling the glazing to interact with a fixed surround.This glazing provides a considerable increase in the internal volume and therefore the possibilities of heat and sound insulation, as a result of the fitting of interpolated elements.

Abstract: A curved corner bent from a hollow-profile construction to form a spacer frame of an insulating glazing, where an opening is provided in the inner wall and in the side walls of the hollow-profile construction in the corner zone, so that a free transverse edge on one side of the opening clamps over a free end portion on an opposite side of the opening when the hollow-profile construction is bent at a right angle to form the curved corner, and a process for the production of the corner, in which the opening is a rectangular cut-out into the inner wall and U-shaped cut-outs cut into the side walls, where the side walls are braced during the bending in such a way that the free transverse edge is guided onto the free end portion to provide flat side surfaces on the curved corner after the bending thereof.

Abstract: The present invention is directed to a method making an insulated wall panel, used in glazing, having two plates that define an internal space. In one of the plates a hole is drilled to form a receiving aperture into which a permeable capsule is inserted. The permeable capsule releases excess vapors from the internal space with unidirectional effect. The panel can then be mounted in situ and the permeable capsule is left in place to provide for the ongoing evacuation of excess vapors from the internal space.

Abstract: An improved insulated glazing unit is provided which can attain about R5 to about R10 thermal performance at the center of the glass while having dimensions about the same as those of a conventional double glazed insulated glazing unit. An outer glazing and inner glazing are sealed to a spacer to form a gas impermeable space. One or more rigid, non-structural glazings are attached to the inside of the spacer to divide the space between the inner and outer glazings to provide insulating gaps between glazings of from about 0.20 inches to about 0.40 inches. One or more glazing surfaces facing each thermal gap are coated with a low emissivity coating. Finally, the thermal gaps are filled with a low conductance gas such as krypton gas.