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: 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 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: A unit for use with a snap-in metal ceiling panel, which comprises an elongated snap-bar comprising spring-like arms extending from a common, integrally formed base portion and terminating in opposed free ends biased towards one another, first and second elongated members held within said spring-like arms and depending from said snap-bar, said first member having a first portion held within said snap-bar and a second portion transverse to said first portion and terminating in a free end, and said second member having a body portion with one edge thereof held within said snap-bar and with a clip portion longitudinally extending along the opposite edge thereof, said clip portion having a spring-like arm integral with said body portion terminating in a free end biased toward said body portion, said clip portion facing away from said transverse portion and being operable to retain a side wall of a metal ceiling panel.

Abstract: Apparatus for producing an air curtain at the perimeter of a room, which comprises a plurality of air curtain units for delivering a thin, fan-shaped flow of air mounted adjacent the interior of the wall defining the room and spaced apart by a distance such that the fan-shaped flow of air delivered by each said air curtain unit overlaps the fan-shaped flow of air delivered by the next adjacent air curtain unit; each said air flow unit having an air inlet, a narrow, elongated air outlet, said air outlet being longer and narrower than said air inlet, and a wall between said air inlet and air outlet defining a flow path for air flowing from said air inlet to said air outlet, said wall having a plurality of cross-sections along said flow path to provide a transition between said air inlet and air outlet.

Abstract: A clip for attachment of metal planking to a T-bar, which comprises an elongated main body having parallel sides, a generally trapezoidal projecting portion, and an intermediate portion integral with and joining the longer base of said trapezoidal portion to a side of said main body portion, all of said portions being coplanar and the bases of said trapezoidal portion being parallel to said main body sides, said intermediate portion being shorter than said longer base to define a pair of opposed open slots between said projecting portion and said main body portion for receiving the edges of the metal plank; and an elongated ear normal to and integral with said trapezoidal portion at each inclined side thereof and extending from the longer base to the shorter base thereof, each said ear being operable, when one edge of a plank is secured in a slot and the free edge of the plank is manually pushed against said ear, to cam the free edge of a plank across said ear and into said slot.