Abstract: An acoustic panel having highly desirable sound absorption characteristics. The panel is preferably formed of an open frame, there being at least one septum centrally located within the frame opening and in contact with the frame members. On each side of the septum are expanded fiberglass batts. Both sides of the frame are faced with perforated hardboard sheets which, in turn, are covered by an open-cell foam layer and a layer of scrim material comprising metal foil and a tear-resistant backing. The panels can be covered with a decorative fascia such as fabric or synthetic sheet materials.

Abstract: A modular acoustical panel for use in separating and dividing an interior space includes a generally hollow, open frame member having a generally rectangular wall portion which surrounds and defines a core-receiving space. A modular septum which is arranged with a center partition offset so as to have a surrounding wall and surrounding flange is preassembled with two layers of insulating material on opposite sides of the center portion of the offset partition. The modular septum is able to be assembled off-line and brought to the point of final assembly into the frame. The center portion of the modular septum and the two layers of insulating material are inserted into the core-receiving space and the outer flange of the partition attaches directly to the outer surface of the frame on one side. A spacer is provided on the opposite side to make the thickness symmetrical and thus account for the thickness of the flange portion.

Abstract: The apparatus, for manufacturing building panels for construction walls with antiseismic and thermoacoustic insulation characteristics, includes a horizontal table for assembling a panel formed by at least one layer of insulating material and by a pair of metal grids associated with the opposite faces of said insulating layer, means for advancing said panel step by step to a station for inserting, cutting and welding connecting elements of said metal grids. The inserting and welding station includes means adapted to insert the connecting elements transversely to the insulating layer, lower welding means adapted to weld the connecting elements, which pass through the insulating layer, to the lower metal grid of the panel, means for cutting the connecting elements at the upper metal grid of the panel, and upper welding means adapted to weld the cut connecting elements to the upper metal grid of the panel.

Abstract: An acoustical panel, for ceilings or for area separation, and the method of making such panels, wherein the panel consists essentially of a unitary frame consisting of four sides, each with an inwardly opening channel, an outwardly opening rebend and a downwardly extending flange, the panel further including a rigid gypsum board with edges filling the frame channel, a low density sound absorbing mat within the confines of the downwardly extending flanges, and a porous fabric facing concealing the acoustical mat and affixed to the frame by disposing the fabric edges in the outwardly opening rebends and crimping the rebends tightly closed.

Abstract: A highway sound barrier formed by one or more panels mounted in a vertical abutting relation, each of the panels being formed from one or more self-supporting foam cement blocks. Each of the blocks having a foam core, a reinforcement grid mounted on the exposed surfaces of the core and a cementitious coating applied to the reinforcement grid for securing the grid to the foam core and to increase the compressive strength of the blocks. Thicknesses of the blocks being sufficient to form a load bearing structure. The panels being anchored to the ground by a helical screw anchor rod embedded in a concrete pad, with the support posts being mounted in either a common verticle plane or alternately offset.

Abstract: An acoustical wall panel assembly in which each wall panel includes a rectangular metallic frame member, an acoustical core panel fixedly secured within the frame, and a decorative panel. The decorative panel is removably secured to the frame by a plurality of adhesive strip members. The wall panel assembly further includes an upper track having a downwardly extending flange portion and a cover panel secured adjacent the vertical edges of adjacent panels. The cover panel has flange portions overlying the vertical side edges of the decorative panels. The adhesive strip members, the upper and lower tracks, and the flange portions of the cover panels coact to firmly maintain the decorative panels in position relative to the frame members.

Abstract: An element of insulating material, particularly for heat and/or sound insulation of buildings and for mounting between supports, has a body including a plurality of supports, has a body including a plurality of separate parts which are formed by at least one continuous beveled cut and shaped so that they are displaceable relative to one another during mounting and can be clamped between supporting elements.

Abstract: A noise barrier system having support members and noise absorbing panels is disclosed. The noise absorbing panels include a front corrugated perforated sheet and a rear corrugated solid sheet which define a chamber. A central sinusoidally corrugated perforated sheet is provided within the chamber. A first blanket of low frequency noise absorbing material is disposed adjacent the front face of the central member and is configured so that a resonance zone is provided between the first blanket and the rear surface of the front sheet. A second blanket of higher frequency sound absorbing material is provided between the rear surface of the central member and the front surface of the rear sheet.

Abstract: A soundproof structure is provided at its surface with a lining of a catadioptric material which forms a light source when a light beam impinges on it.

Abstract: A suspended ceiling suspended from the structural ceiling of a room, which comprises a plurality of parallel, elongated, snap-bars, each having a pair of longitudinally extending, opposed spring-like arms biased to be closely together, and a plurality of metal ceiling tiles held by snap bars in side-by-side relationship, each said ceiling tile having a planar metal body having opposed sides, opposed ends, top and bottom faces and 90.degree. corners, a pair of spaced tabs at each side projecting from said top face, and a layer of vitreous material on said bottom surface, the tabs of one side of one ceiling tile being held within the same snap-bar as the tabs of the immediately adjacent side of the next adjacent ceiling tile.

Abstract: A suspended ceiling system for a room comprises a plurality of inverted T-shaped members suspended from the structural ceiling of the room and extending across the room, each T-shaped member having a horizontal base portion, and a plurality of open metal ceiling panels having opposed sides and ends and a bottom are supported by the inverted T-shaped members by means of a flange on one side wall of a panel resting on one side of the horizontal base portion which is received in a slot formed between the flange and detents in the side wall, while the other side of the horizontal base portion is received in slots in the end walls of the next adjacent panel.

Abstract: An insulation ceiling assembly which may be affixed to bar joists or purlins to allow installation of building insulation below the roof. The assembly may be used with both metal deck and standing seam style roofs without interference to fixtures, tubing or other apparatus running underneath.

Abstract: A floor-to-ceiling wall system having telescoping studs that extend between a ceiling bracket and a floor leveler assembly. The floor leveler assembly includes a leveling channel that is adjusted in order to level an entire wall. During assembly, a first telescoping stud is secured between the ceiling channel and floor leveler assembly and vertically aligned. Thereafter, subsequent studs are automatically aligned by the securing of horizontal stringers sequentially between the telescoping studs. Door jams and window frames are secured to the studs, and wall panels are hung from the horizontal stringers. Adapter brackets hung from the vertical studs accommodate wall accessories with various mounting hook patterns in order to adapt the wall system to a wide variety of wall accessories.

Abstract: A space divider of generally rectangular shape having perforated walls (1-8) with two opposite edges inturned to mate to form cavities (6) to hold acoustic bats (7) therebetween and including intersecting stiffeners (4-5) and means (16) to hold a pull-over fabric cover and including apertures (15-24) in end closures (11-22) to engage forming and locating means for the panels and for attaching shelving.

Abstract: A suspended ceiling system for a room comprises a plurality of inverted T-shaped members suspended from the structural ceiling of the room and extending across the room, each T-shaped member having a horizontal base portion, and a plurality of open metal ceiling panels having opposed sides and ends and a bottom are supported by the inverted T-shaped members by means of a flange on one side wall of a panel resting on one side of the horizontal base portion while the other side of the horizontal base portion is received in slots in the end walls of the next adjacent panel.

Abstract: A method for refurbishing a suspended acoustical tile ceiling when the tiles become soiled comprises inserting a tile insert beneath each soiled tile to provide a new face to the suspended ceiling. The tile insert comprises a thin layer of substantially rigid material with an acoustical pattern of holes extending therethrough. The tile insert has a front face which is of washable material. In this manner, an entire suspended ceiling system can be refurbished without the need to remove the existing tiles. The tile insert may include a moisture barrier on the rear face of the tile insert. The moisture barrier improves washability of the tile and significantly enhances the noise reduction properties of the refurbished suspended ceiling.

Abstract: A suspension ceiling system is disclosed which combines snap-up pans and lay-in panels. Such system includes runners formed with channels at the lower edges thereof formed by opposed lateral flanges, depending side walls, and inturned lips. The inturned lips terminate at inner edges which are spaced apart to provide a longitudinal opening on the lower side of the channel. Lay-in panels are positioned in some of the grid openings, and provide peripheral edges supported by the flanges. Snap-up panels formed of sheet metal are provided with peripheral flanges having inwardly directed ribs extending lengthwise of the flanges and spaced from the lower pan surface. The flanges are positioned in the openings beween the runner lips with the ribs snapped over the associated lip to secure the snap-up panels in position. The lips provide a delineation between the lay-in panels and the adjacent flanges of adjacent snap-up panels are spaced by substantially the same distance to provide a similar delineation.

Abstract: A portable panel of partitioning a building space, which panel is aesthetic, practical in use and not very expensive to manufacture. This panel comprises two wall units both having the same surface area. The units are mounted end to end and externally covered with a single piece of cloth fixed to their internal periphery. The wall units are closed once against the other with the piece of cloth acting as a hinge, such closing advantageously dissimulating the fixation of the piece of cloth onto the wall units and thus avoiding the use of a decorative mask. The panel also comprises at least one passage provided in at least one of the wall units for operatively installing the panel in the building space in a removable manner. In addition, the portable panel may further comprise a sound insulating sheet provided on its both sides with a covering layer of not compressed material for improving the acoustic efficiency of the whole panel.

Abstract: A movable, prefabricated wall panel having a rigid rectangular frame. A core structure is disposed in the region bounded by the frame, which core structure preferably comprises at least one honeycomb layer. Sheetlike skins are fixedly secured to opposite sides of the frame and extends across the region bounded by the frame for confining the honeycomb layer therebetween. A plurality of small openings are formed in either or both of the skins so that they communicate with cells of the honeycomb layer to create Helmholtz sound-absorbing chambers. Each sheetlike skin is covered by a layer of porous fiberglass material for absorbing sound, which layer includes an inner thin mat of high-density fiberglass which is in turn covered by a relatively thick outer layer of low-density fiberglass. This outer layer has a variable density gradient across the thickness thereof, which density gradient progressively increases across the thickness toward the mat.

Abstract: Method for mounting a structure comprising a number of girders or similar as a roof, floor or similar. The girders are interconnected at their lower side by a flexible sheet or similar and the unit thus assembled is pushed together by moving the girders close together and folding the flexible sheet. The unit is transported from the manufacturing place to the building site, where the unit is placed in its final place and the girders are moved apart to their final position. A structure is adapted to be mounted according to the method having girders interconnected by a flexible member at their lower ends.

Abstract: A tackable acoustical structure comprising a tack pin retaining layer, a sound absorptive layer, and a metal foil septum separating the tack pin retaining layer and the sound absorptive layer. The structure can be formed into wall panels having a flame spread index which qualifies them as a Class A rated building materials.

Abstract: A suspended ceiling system for a room comprises a plurality of inverted T-shaped members suspended from the structural ceiling of the room and extending across the room, each T-shaped member having a horizontal base portion and a vertical leg portion; a plurality of open metal ceiling panels having two pairs of opposed sides and a bottom, and acoustical insulation in the panels, at least one pair of opposed sides being perforated; and each panel being supported by the inverted T-shaped members with the panel bottom and the pair of opposed perforated panel sides spaced from and facing the horizontal base portion and the vertical leg portion, respectively, of the pair of inverted T-shaped members.

Abstract: The present invention is an acoustic panel having a porous layer and a generally rigid layer affixed to each other. The generally rigid layer includes at least one passageway opening on one side of the rigid layer and extending through the rigid layer to the porous layer. The porous layer is a fibrous material. The rigid layer is a concrete-type material, such as vermiculite-cement plaster. This acoustic panel further comprises a generally rigid planar surface positioned adjacent to the porous layer. This generally rigid planar surface can comprise an insulating layer affixed to the other side of the porous layer and a structural layer fastened to the insulating layer. The insulating layer is a polyurethane foam board. The structural layer is a particle board.

Abstract: An acoustical ceiling tile is provided with a metal facing sheet covering at least one raised rib on the surface of the acoustical tile. The raised rib has two parallel sides and the facing sheet is made with two parallel edges having the ends thereof spaced apart a distance slightly less than the rib width. Consequently, the edges of the facing sheet will engage the edges of the rib and frictionally hold the facing sheet over the flat surface of the rib.The above structure will permit humidity and temperature to cause fluctuation in the dimensions of the base sheet containing the raised rib without resulting in any distortion of the metal facing sheet.

Abstract: A vibration dampening stiffener beam (10, 10') is secured to a panel member, such as an electrical circuit board (12) that is supported at opposed ends. The beam (10, 10') extends across a mid portion of the board (12) whereat displacement of the board caused by vibration is at a maximum. The beam is an "I" beam or an inverted "T" beam. It has a mounting flange (22, 22') which is bonded or otherwise secured to the member (12) which it is to stiffen. An energy absorbing material (30) is placed on the sides of the web (24, 24') of the beam (10, 10"). This material (30) consists of thin metal constraining layers (32) bonded to each other and to the side surfaces of the web by means of a viscoelastic material (34).

Abstract: A ventilation inset for shielded cabins and room screening devices, includes mutually parallel and spaced apart adjacent metal sheets each having slots formed therein, the slots in each of the sheets being shifted relative to the slots in the next adjacent sheet, and a multiplicity of air-permeable waveguides disposed between each two adjacent sheets providing communication between the interior of the cabins and the surroundings.

Abstract: In a ceiling comprised of rectangular metal ceiling panels each having a perforate face panel and an imperforate back panel spaced from one another, the side and end margins of the face and back panels being defined by the bend of lips integral with the panel, the lips of face and side panels being joined to form side and end walls, the end walls are provided with an inverted, open-mouthed channel, offset inboardly with respect to the back panel and intermediate the height of the end wall between the face and back panel, and the side walls of contiguous ceiling panels are provided with an outwardly opening cove along one panel and an outboardly projecting tongue in the contiguous panel.

Abstract: The structure comprises a heat insulating panel maintained between an inner metal revetment and an outer metal revetment. The revetments are provided with ribs which project into the panel and the ribs of the two revetments are perpendicular to one another. A thin core of insulating material is applied against one of the revetments by a thin and solid metal sheet.

Abstract: A wall panel includes a peripheral metal frame which may be free-standing or part of an open office partition system, and a removable acoustical insert. The acoustical insert is formed of pressed glass fiber and includes an integral border of substantially greater density than the main body portion of the insert to add rigidity to the insert and provide a stiffened portion for mounting clips which are used to removably secure the acoustical insert to the peripheral metal frame so that the border is in register with the frame.

Abstract: Viscoelastically damped reinforced skin structures wherein a sandwich skin having a relatively thick core is supported by structural elements, such as stringers and frames, are disclosed. In one form (FIG. 1), a main skin (15) is supported by stringers (13) that are in turn supported by frames (11). The skin, stringers and frames are securely attached to one another by any suitable means, such as a bonding adhesive, rivets, bolts, etc. Located between the stringers are core layers (17) formed of honeycomb or foam materials. A first plate (21) overlies each core layer and extends to the flanges of the adjacent stringer. A second plate (25) overlies each adjacent pair of first plates. The core layer is viscoelastically attached (19 and 23a) to the skin and the first plate; and, the first plate is viscoelastically attached (23b, c and 27a, b) to the stringer flanges and to the second plate. Alternatively, a single plate (49, FIG. 3) can overlie the core layers (47) and the stringers (43).

Abstract: A suspension ceiling or wall system is disclosed providing a plurality of spaced, rectangular pans or projections positioned in spaced relationship in a pattern to provide a ceiling or wall surface with the appearance of a plurality of such pans suspended in space. The pans are formed from sheet metal into elongated members having a plurality of pans supported by integral, longitudinally extending rails. The rails are provided with a dark color contrasting with a relatively light color on the exposed portion of the pans so as to obscure the presence of the connecting rails.

Abstract: A movable partition panel is made with a perimeter frame and supporting members for easily, quickly and in a low cost manner fastening and reinforcing braces in place and permitting the rapid installation of fabric to the outside of the panel.

Abstract: A double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second honeycomb core with end wise directed cells, a second perforate facing of thin sheet material and a second layer of porous fibrous material. The resulting sandwich panel has a predetermined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores. The cell of the first and second honeycomb cores may be of equal or different volume cells and may be constructed of similar or dissimilar materials.

Abstract: The invention relates to a ceiling component which is formed by a curved panel and has a support which supports a layer of sound-proofing and heat insulating material. The support is made in one piece and is constituted by a metal sheet whose edges are bent back on itself and then to form a flange projecting from one surface of said panel. The bent edges alone provide the rigidity necessary for the panel without requiring the use of ribs and girders.

Abstract: The panel includes a fibrous glass board, a channel-shaped metal frame, and decorative fabric or plastic film adhered to the lower surface of the board and frame. The frame has an upper flange cooperable with an inverted T-bar of a suspended grid and a lower flange which extends halfway across the head of the inverted T-bar in the mounted position of the panel. Each pair of adjacent mounted panels covers the T-bar therebetween. The board is supported mainly by tabs on the frame. Because the bottom of the board is flush with the bottom of the frame, the frame is unnoticeable behind the decorative covering. The adherence of the decorative covering to the board and frame reduces potential sagging of the board and permits the panels to be made larger.

Abstract: Method of fabricating attenuation sandwich panels having a central cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a perforate facing sheet with an outer layer of porous fibrous material adhered to the other surface. The combined perforate sheet and porous fibrous material have a predetermined open surface area prior to attenuation panel fabrication. The perforation exposed surface of the combined perforate sheet and porous fibrous material is covered with a maskant material which covers the surface only. The porous fibrous surface is then saturated with a liquidous anti-wetting solution which coats substantially all of the fibers. The solution is allowed to dry and the maskant is then removed from the opposite surface. The components making up the panel are then assembled and bonded together to form the attenuation panel.

Abstract: A method for producing an acoustical ceiling tile or panel faced with a distortion free decorative thin plastic film is accomplished by first embossing the acoustical base to form a picture frame surrounding a recessed area, stretching the thin decorative plastic film over the picture frame portion and adhesively securing the film to the side and/or back of the acoustical base and subsequenytly heat shrinking the film to produce a distortion free decorative surface.

Abstract: The wall comprises a closed acoustic box-structure which is defined by a slightly ribbed sheet and a flat sheet. The box-structure has lateral ribs which extend beyond the sheet. A panel of high-density mineral wool which is of small thickness is enclosed inside the box-structure. A heat insulator covers the box-structure and the ribs of the box-structure and is protected by an outer trough which has ribs or corrugations perpendicular to the ribs of the box-structure.

Abstract: A sound absorbing panel for use in industrial sound control is disclosed and includes a sound absorbing material completely enclosed in a heat shrunk plastic material and supported by a frame extending about the outer edge of the enclosed sound absorbing material.

Abstract: An upright space divider panel having a rigid rectangular frame, and first and second thin sheetlike skins fixed to opposite sides of the frame and extending across the region defined therein. A honeycomb core structure is disposed within the frame and confined between the skins. The honeycomb core structure comprises a cellular honeycomb layer having a plurality of cells formed therein and extending across the width of the layer, so that opposite ends of the cells are closed by the skins. The first and second skins are identical and each have a plurality of openings formed therethrough. The openings in the first skin communicate with a first plurality of the cells for forming a first plurality of sound absorbing chambers which open outwardly through one side of the panel. The openings in the second skin communicate with a second plurality of the cells for forming a second plurality of sound absorbing chambers which open outwardly through the other side of the panel.

Abstract: An acoustical panel formed of a core of sound-attenuating material having a front and a back surface. The edges of the core are resin-hardened for rigidification. The core is covered by a fabric stretched over its front surface adhered to the hardened edges and to the back surface. A board cover is fixed on the back surface over the core and the ends of the fabric.In other versions of the invention, the core is reinforced by having its edges encased in a frame to which it is secured by the resin. The fabric is stretched over the frame and core thereby forming an air gap between the fabric and the core which improves the acoustical efficiency of the panel and masks the outline of the frame. High-impact-resistant channel members of different shapes constitute the frame.

Abstract: A sound-absorbing panel having a front and a rear sheet, the front sheet being corrugated and perforated; a filler of particles of elastic material lies between the sheets.

Abstract: An embossed film-to-foam laminate is provided having minute perforations through the film selectively distributed essentially along the sidewalls and valleys of the embossed pattern. The integrity of the laminated film material is retained on the crowns of the embossed patterned surface, since the perforations in the film material are mainly distributed on the sidewalls and valleys of the embossed pattern. The laminated product has a water-resistant and abrasion-resistant upper surface imparted by the film material on the crowns while the small perforations in the sidewalls and valleys permit sound to pass through the film and be exposed to the acoustical matrix of the open cell foam component of the laminate while impeding the penetration of liquids (e.g. water) through the film into the foam under the action of gravity. The film and/or the foam material are heated to supply adhesive material by melting or softening which serves to bond the film material to the foam.

Abstract: A movable, prefabricated wall panel having a rigid rectangular frame. A core structure is disposed within the region bounded by the frame, which core structure comprises at least one honeycomb layer. Sheetlike skins are fixedly secured to opposite sides of the frame and extend across the region bounded by the frame for confining the honeycomb layer therebetween. A plurality of small openings are formed in either or both of the skins so that approximately a single opening will communicate with a single cell as defined by the honeycomb layer. The opening and the cell are of a preselected size so as to function as a sound absorbing chamber. The sheetlike skins are also covered by a layer of fibrous sound absorbing material, preferably fiberglass.

Abstract: An embossed film-to-foam laminate is provided having perforations through the film selectively distributed essentially along the sidewalls and valleys of the embossed pattern. The integrity of the laminated film material is retained on the crowns of the embossed patterned surface, since the perforations in the film material are mainly distributed on the sidewalls and valleys of the embossed pattern. The laminated product has a water-resistant and abrasion-resistant upper surface imparted by the film material on the crowns while the perforations in the sidewalls and valleys permit sound to pass through the film and be exposed to the acoustical matrix of the open cell foam component of the laminate. The film and/or the foam material are heated to supply adhesive material by melting or softening which serves to bond the film material to the foam.

Abstract: A masonry block includes pairs of opposed side walls and opposed web walls forming a cavity therebetween. One of the side walls is apertured to conduct sound waves into the cavity. A panel formed of acoustically insulative material is disposed in the cavity and is spaced from the side walls to form front and rear sound damping chambers therebetween. Sound waves passing through the apertured side wall enter the front damping chamber and are subjected to a damping action within the block. Various sizes, shapes, and patterns of openings in the apertured side wall can provide varying sound damping effects. The panel may be inclined at an acute angle relative to the apertured side wall. The block cavity may be divided into cavity portions of different volume to provide for effective sound damping of high and low frequency sound waves.

Abstract: A sound insulating panel having improved sound absorption properties. Known sound insulating panels are of sandwich-type construction, requiring several manufacturing steps which are both time-consuming and expensive. Additionally, partitions can be formed from panels according to the present invention which require neither special skills nor additional tools when erecting or dismantling the partitions. According to the present invention, there is provided an improved sound insulating panel having a pair of opposed major surfaces extending between a pair of opposite vertical edges. One of a pair of complementary tapes are mounted on at least one of the vertical edges of the panel. The tape is adapted to releasably engage a second complementary tape located on a second structure, such that the two tapes form a sound absorbing connection between the panel and second structure.

Abstract: A unitary structural panel for ceiling and wall installations has a dimensional stability and structural strength to be edge supported as a unit without sagging or warping, a high impact resistance, a good fire rating and easy washability. It comprises a relatively thick fabricated panel which of itself may be subject to sagging or warping or impact damage or fire damage or soil damage, and a relatively thin and flexible laminated facing for the fabricated panel. The thin and flexible laminated facing includes a metallic film, a glass fiber scrim and a synthetic plastic film adhesively secured together with the scrim between and bonded to the metallic film and the synthetic plastic film and with the metallic film bonded to the synthetic plastic film within the openings in the scrim. The laminated facing is adhesively secured to the fabricated panel with the metallic film thereof bonded to a face of the fabricated panel and with the synthetic plastic film thereof exposed.

Abstract: A sound rectangular parallelepiped structure having 12 edges and being comprised of a wire lattice having sound absorbing material housed therein, said lattice having longitudinal wires and transverse wires which cross over each other at a plurality of locations, the longitudinal and transverse wires being fixedly interconnected to each other at at least a majority of said plurality of locations causing the structure to be inherently stable, a wire being located at each of said edges of the structure and the spacing between the wires in at least one direction of said lattice being the same as the thickness of the structure.

Abstract: An acoustical insulating fiber panel having two pairs of parallel edges, elongated extruded framing members extending along the edges of the panel, each framing member being rigid and including a first web portion adapted to engage the edge of the panel, a first flange at right angles to the web for engaging the suspension hanger-flanges, a second flange extending as a projection of the lower surface of the panel and extending a short distance beyond the projection of the first flange. The second flange has further webs extending inwardly of the flange at 90.degree. thereto and forms a material receiving jaw. An aesthetic covering material is stretched across the lower surface of the acoustical fiber panel and engages said so-formed jaws on the second flange of said framing members, and locking means are provided within the jaws for holding the edges of the covering material.