Abstract: An air outlet vent (1) adapted to be mounted in a floor (6) and connected to a heating, ventilating and air-conditioning air supply duct (30) includes a cylindrical housing (2) and a cover plate (4) that covers the top open end of the housing (2). The plate (4) includes a first group of air outlet openings in the form of concentric circular arcuate slits (11) extending over a first sector of the plate (4), and a second group of air outlet openings in the form of radially extending slits (12) in a second sector of the plate (4). The plate (4) is rotatably adjustable in the housing (2). With this arrangement, the direction of the main air flow axis of the air flow pattern generated by the vent can be infinitely rotationally adjusted around an imaginary inverted cone, to direct the air flow where desired and avoid undesirable drafts, while still providing a highly turbulent twisting or spiraling air flow characteristic.

Abstract: An air vent for the generation of high turbulence air jets is comprised of a rotationally symmetrical casing having a flared discharge mouth. A deflector plate is mounted in the plane of the mouth to define with the mouth an annular discharge opening. An air guide is mounted within the casing that includes an annular flared deflector portion located adjacent the discharge mouth of the casing. Radially extending twist paddles or fins are mounted on the air guide to impart a twist to the air stream. The air guide is preferably adjustably mounted within the casing for movement axially thereof whereby when the deflector portion of the guide is disposed above the plane of the mouth portion a spreading of the air stream is achieved, and when the deflector is located below the plane of the mouth portion a concentration of the stream is achieved, intermediate effects being achieved at intermediate positions of the guide relative to the casing.

Abstract: A device for introducing a low turbulence air displacement flow into an enclosed space, has a first housing section enclosing an air distribution space having an air inlet on one side and air flow passages through another side, and a second housing section having a perforated outer jacket and a non-perforated central core pipe. One central air flow passage connects the core pipe to the air distribution space. A ring of holes or a ring gap leads into a ring space formed between the perforated jacket and the core pipe. A third air passage permits forming an air skirt around the outer surface of the jacket. Control elements permit selectively opening and closing the flow passages, so that all or part of the fresh air may pass through the core pipe and air skirt or through the ring space. The perforated jacket may have a cylindrical portion and a frustum portion connecting the cylindrical portion to a perforated bottom plate.

Abstract: Fresh air is supplied into an enclosed space by an air flow radially and substantially without turbulence horizontally over a floor by an air outlet, the outlet openings of which are substantially flush with the floor surface. The air outlet has a cylindrical air guide collar (1) and a concentric insert (7). The air guide collar (1) has a curved collar section (3) merging radially outwardly into a flange (4) which overlaps and bears against the edge of an opening (2) in the floor. The funnel-shaped insert (7) converges from the top to bottom and has an insert flange (8) that extends radially outwardly in the same plane as the collar flange (4). The insert flange (8) narrows an annular flow passage (9) between the air guide collar (1) and the insert (7). The exhaust aperture of the insert (7) can be closed to some extent by a transverse, horizontally arranged deflecting or baffle plate (12).

Abstract: An air release box has at least one perforated bottom wall section and perforated longitudinal side wall sections. At least certain of the perforated wall sections, including the perforated bottom wall section, are equipped with spin air outlets for increasing the penetration depth of low turbulence air jets into a room. Without such spin air outlets the low turbulence air jets tend to be unstable at relatively low exit velocities. The tendency of these air jets to quickly decay is thus delayed. The highly turbulent air jets exiting from said spin air outlets do not entrain air in the room, but rather they entrain inlet air coming through the perforated wall sections neighboring the spin air outlets. Thus, the jet impulse imparts a high stability to the inlet air jets.

Abstract: An air conditioning system for a grocery store having refrigerated food displays along certain aisles of the store includes a plurality of air ceiling mounted air outlet diffuser units. A plurality of the units are positioned substantially above the aisles adjacent the refrigerated food displays. Each diffuser unit positioned above the aisle adjacent the refrigerated food displays is constructed so as to provide a downward flow of conditioned air into the store in a manner so that shoppers receive conditioned air free of drafts while heavy, cool, stagnant air lying adjacent the refrigerated food displays is induced upwardly into upper regions of the store. Each diffuser unit has a housing with a flared exit mouth, a tubular air passageway within the housing and an annular air passageway therebetween. A plurality of vanes are positioned in the annular passageway for producing rotational, highly turbulent currents of air flowing from the passageway.

Abstract: An air conditioning system for a grocery store having refrigerated food displays along certain aisles of the store includes a plurality of ceiling mounted air outlet diffuser units. A plurality of the units are positioned substantially above the aisles adjacent the refrigerated food displays. Each diffuser unit is positioned above the aisle adjacent the refrigerated food displays and is constructed so as to provide a downward flow of conditioned air into the store and over an extended area of the aisle in a manner so that shoppers receive conditioned air free of drafts while heavy, cool, stagnant air lying adjacent the refrigerated food displays is induced upwardly into upper regions of the store. Each diffuser unit has a housing with a flared air exit mouth which includes an outwardly extending arcuate surface to define a rounded outlet mouth thereat so that some horizontal discharge of air always is provided. A tubular air passageway within the housing includes an annular air passageway therebetween.

Abstract: Angular sections form frames which can be fitted together in the frame plane in modular fashion. Legs of the sections are formed so that through two interconnected legs of adjacent frames notches of T-shaped cross-section result, into which hammer head-shaped ends of pull rods can be introduced. By means of the pull rods, ledges can be pressed against filter and/or light fixture housings, which in this manner are pressed against legs of the profiles on the opposite housing side, adjacent frames thus make it possible in a correspondingly compact model to attach filters and light fixtures without the distance between two adjacent filters or between a filter and a light fixture occupying a width that would impair the flow profile of the air issuing from the filters.