Abstract: A vehicular air conditioning unit includes an air-conditioning case and a blower. The blower includes a blower fan accommodated in the air-conditioning case and configured to rotate about a fan axis to cause the air to flow through the case passage, and a blower motor accommodated in the air-conditioning case and configured to rotate the blower fan. The air-conditioning case includes a case body having a case opening hole that is located outward of the blower in a radial direction of the fan axis and opens in the radial direction, and an opening hole cover fixed to the case body to close the case opening hole. The opening hole cover is detachable from the case body. The case opening hole has a size that allows the blower to pass through the case opening hole when the blower is taken out from the air-conditioning case.

Abstract: Air-conditioning diffuser for distributing air, comprising a chamber (10) provided with an inlet orifice (30) for feeding air and with an outlet wall (20) made of a woven or non-woven fabric or foil, the outlet wall (20) comprising at least one array of through-holes (22) for distributing air into the surrounding environment. The air-conditioning diffuser further comprises a plurality of air deflecting pockets (23) for redirecting the air flowing through the through-holes (22) out of the air-conditioning diffuser, each air deflecting pocket (23) being attached to the outlet wall (20) on the outer side of the same, overlapping at least one through-hole (22) spaced apart from the through-hole and being open towards the space adjoining the outlet wall (20).

Abstract: A chilled beam system may incorporate a terminal unit to provide additional heating and cooling capacity including latent cooling. In a system, terminal units may be distributed and connected to cooperate with a primary air stream from a central air handling unit. The chilled beam and/or terminal units may employ features for enhancing heating mode operation. Control embodiments take advantage of the additional capabilities described.

Abstract: A method of controlling an active air flap, includes detecting a location of a vehicle from a GPS signal received through a GPS receiver, and acquiring a road surface gradient of a road on which the vehicle travels from location information of the vehicle and map information stored in a data storage, by a controller, determining an opening degree setting value corresponding to the road surface gradient of the road, by the controller, outputting a control signal for controlling an opening degree of an air flap according to a setting value, by the controller, and controlling the opening degree of the air flap by operating an actuator according to the control signal.

Abstract: An air handler and a method of assembling a fan module are provided, in which a case panel may be assembled with a plurality of module frames via a considerably simplified sliding coupling providing excellent hermetic sealing. As such, manufacturing costs may be reduced due to reduction in a number of components, and assembly time may be remarkably reduced due to a reduced number of assembly operations. This advantageously results in reduced labor cost and enhanced air conditioning efficiency.

Abstract: The present invention provides devices and methods for the impregnation of air with the vapour or aerosol of a substance in a ‘controllable manner to enable the testing or training of detection means to evaluate and quantify the presence of the substance in an enclosed volume, and i?• particular to enable production of training aids and quality assurance test items for use in canine-olfaction based security screening.

Abstract: Disclosed therein is an air conditioner for a vehicle which includes a sealing member attached to one side of a door member of a mode door face-sealed with the inner face of an air-conditioning case by the inside wind pressure of the air-conditioning case so as to prevent vibration of the door member by wind pressure of the inside of the air-conditioning case and prevent air leakage from the face-sealed part, and which includes a rib formed on the door member for preventing excessive pressure of the sealing member in order to make actuating force of the door member uniform and to enhance a passenger's sense of manipulation.

Abstract: Methods and a device for mixing airflows in an environmental control system are provided. The device includes a duct configured to receive a first airflow and a second airflow, and a plurality of guide vanes disposed within said duct. The guide vanes are configured to induce rotation of the first and second airflows flowing through the duct.

Abstract: A dishwasher having a water vapor vent structure is provided. The water vapor vent structure may include an outer cover having one or more water vapor vents, and an inner cover detachably mounted to the outer cover and having condensation channels for condensing water vapor. As water vapor is collected and maintained in the condensation channels for a period of time, condensation efficiency may be enhanced, and air quality in a room in which the dishwasher may be maintained at an acceptable level.

Abstract: A supply air terminal device (10) has a supply air chamber (12), into which fresh air is conducted from out of doors and further from it through a nozzle gap or nozzles (12a1, 12a2 . . . ) into a mixing chamber (14). The fresh supply air (L1) induces a circulated airflow (L2) from a room (H) to flow through a heat exchanger (13) into the mixing chamber (14). The combined airflow (L1+L2) combined in the device solution of the fresh supply air (L1) and the room air (L2) flow is made to flow from the mixing chamber (14) into a room space (H) or other such. The mixing chamber (14) of the supply air terminal device (10) has in the mixing chamber (14) or in connection with this in a flow passage (14?) a film element (15), preferably a film-like electric resistance.

Abstract: A mixing device that is particularly suitable for use in an aircraft air-conditioning system comprising a cold air supply line adapted to supply cold air to the mixing device. A first recirculation air supply line is adapted to supply recirculation air to the mixing device. A mixing chamber is connected to the cold air supply line and the first recirculation air supply line and is adapted to supply the cold air supplied to the mixing device via the cold air supply line with the recirculation air supplied to the mixing device via the first recirculation air supply line. The first recirculation air supply line has a heat transfer portion which is thermoconductively connected to an area of a wall delimiting the mixing chamber that is at risk of icing.

Abstract: This invention relates to a mixing device for an aircraft air conditioning system with a supply conduit for fresh air from the air conditioning system, with a second supply conduit for recirculated air from a pressurized region of the aircraft, and with a discharge conduit for supplying mixed air into the pressurized region of the aircraft, wherein a non-return valve is integrated in the mixer.

Abstract: A ventilation fan unit with a heater, including: a frame with an opening provided at the underside of the frame; a cover having an air outlet and an air inlet provided at the opening of the frame; a snail-shaped casing with an air exit provided in the frame; a circulating fan enclosed in the snail-shaped casing; and a heating portion including a spiral heater mounted at the air exit of the snail-shaped casing, wherein the heating portion is communicated with the circulating fan through the air exit, wherein an axis of a spiral shape of the heater is in parallel with a rotation axis of the circulating fan, wherein the rotation axis of the circulating fan is located obliquely above the axis of the spiral shape of the heater.

Abstract: Oxygen regulator (1) to deliver breathing gas in a cabin (10) of an aircraft comprising a first inlet (12) for pressurized breathing oxygen, a second inlet (14) for diluter gas, an outlet (16) to provide a breathing mixture to a user, and a regulation device adjusting the concentration of breathing oxygen in the breathing mixture. The regulation device comprises a emergency device (30) that adjusts the concentration of breathing oxygen in the breathing mixture as a function of a variation speed of the cabin altitude.

Abstract: The invention concerns a supply air terminal device (10) and a method for regulating the airflow rate. The supply air terminal device (10) comprises a heat exchanger (11), with which a circulated airflow (L2) conducted from a room can be either cooled or heated. The supply air terminal device (10) comprises a mixing chamber (12), into which mixing chamber (12) the air chamber's (15) nozzles (16a1, 16a2 . . . 16an) or a flow gap (16) open to conduct a primary airflow (L1) into the mixing chamber (12), whereby the primary airflow (L1) from the nozzles (16a1, 16a2 . . . 16an) or through the flow gap (16) as a flow (Qs) will induce a circulated airflow (L2) from the room (H) to flow through the heat exchanger (11) into the mixing chamber (12). The combined airflow (L1+L2) is conducted into the room (H). The supply air terminal device (10) comprises a regulator (100) bypassing the nozzles (16a1, 16a2 . . .

Abstract: Temperature control system at the outlet from at least one distribution opening (10, 11) of a transit chamber (30) of a heating and air conditioning device. According to the invention, said system comprises a plurality of air ducts (20, 50) passing through the transit chamber (30) as far as the distribution opening (10, 11). Automobile vehicle ventilation, heating and air conditioning application.

Abstract: A method for delivering air comprising the steps of: discharging a first air stream, wherein the mass flow rate of first air stream can be varied; and discharging a second air stream, wherein the second air stream is arranged to induce the first air stream to deliver a combined air stream with a mass flow rate that can be varied.

Abstract: An air distribution system for an air conditioning system includes an air supply and a plurality of air distribution units. The air distribution units are arranged in a side-by-side configuration. The air supply is operably connected to at least one of the air distribution units. Each air distribution unit includes a delivery feature for delivering air from the air supply through the air distribution unit and into an adjacent air distribution unit.

Abstract: An economizer, and a method for operating the same, is provided having a housing with external airflow section and an internal airflow section. The external airflow section includes one or more external flow blades mounted in an external airflow path. The external flow blades are selectively rotatable between an open position and a substantially closed position. The internal airflow section includes one or more internal flow blades mounted in an internal airflow path. The internal flow blades are selectively rotatable between an open position and a substantially closed position. Each internal flow blade includes a leading portion. The leading portion of each internal flow blade is substantially parallel to the internal airflow path when the internal flow blades are disposed in the open position.

Abstract: An HVAC unit ventilator, particularly suited for schools and hotels, includes a single damper blade driven directly by a motor to control a supply air's mixture of return air and outside air. The damper blade is selectively pivotal to a full outside air position, a full return air position, and various intermediate mixed-air positions. The damper blade has flexible edge and end seals that create little if any frictional drag as the damper blade pivots to the intermediate positions, yet the seals provide a positive, tight seal when the damper stops at either the full outside air position or the full return air position. The unit ventilator includes a filter frame that not only supports an air filter but also provides the damper blade with sealing surfaces and structural support. For rigidity, the damper blade has somewhat of a box-like structure that is bi-directionally reinforced by ribs and triangular gussets.

Abstract: A vehicle heating, ventilation and air conditioning system includes a plurality of ducts for providing conditioned air to an interior of a vehicle. The plurality of ducts includes a window defrost duct and a floor duct. The system includes a mixing chamber upstream of the window defrost and floor duct. A damper is selectively controllable to distribute the conditioned air to one or more of the plurality of ducts. The damper is configured so that when in a floor only mode position, the damper directs conditioned air in the mixing chamber only to the floor duct. A bypass conduit is configured to direct air from the floor duct to the window defrost duct when the damper is in the floor-only mode position. The conditioned air directed through the bypass conduit attenuates noise generated in the mixing chamber from emanating to the window defrost duct.

Abstract: The present invention relates to a flow spreading mechanism, in particular a flow spreading mechanism used with refrigerators or air conditioners to enhance spreading of cool or warm air. To achieve the above-mentioned object, this invention comprises at least one inlet (200) through which fluid flow comes in; a flow separator means (110) dividing the flow coming through the at least one inlet (200) into at least two separate flows; and an outlet (300) through which at least two of the at least, two flows having been divided into separate flows by the flow separator means go out after they meet again, thereby forming complex vortices near the outlet, which make the flow going out of the outlet swing. Flow spreading mechanism of the present invention provides a better uniformity of temperature distribution for refrigerators or air conditioners, compared with the simple-ducted outlet of the prior art.

Abstract: A spark suppression device includes a plurality of blades or vanes that are mounted transversely in a duct of an air handling/dust collection system communicating with a spark source. A controlled flow of air carries sparks from the spark source through the spark suppression device. Sparks are suppressed by turbulence created in the airstream from the blades that have a downstream curvature. The turbulence strips away a hot air bubble surrounding a spark ember, thereby effectively cooling the spark and significantly reducing combustion at the spark ember. Other attributes of the invention contributing to spark suppression include an overlapping arrangement of the blades that results in high-velocity impact of the sparks against the blades, thereby breaking up the spark embers into smaller embers, and creation of rapid increased pressure within the spark suppression device that also helps to strip away the spark ember from the surrounding hot air bubble.

Abstract: A supply air terminal device (10) has a supply air chamber (12), into which fresh air is conducted from out of doors and further from it through a nozzle gap or nozzles (12a1, 12a2 . . . ) into a mixing chamber (14). The fresh supply air (L1) induces a circulated airflow (L2) from a room (H) to flow through a heat exchanger (13) into the mixing chamber (14). The combined airflow (L1+L2) combined in the device solution of the fresh supply air (L1) and the room air (L2) flow is made to flow from the mixing chamber (14) into a room space (H) or other such. The mixing chamber (14) of the supply air terminal device (10) has in the mixing chamber (14) or in connection with this in a flow passage (14?) a film element (15), preferably a film-like electric resistance.

Abstract: Systems and methods to regulate the amount of outdoor air that is introduced into a building. These systems and methods use the cooling coil control signal which is a function of the load on the cooling coil. These systems and methods utilize extremum seeking control logic to vary the flow of outdoor air into the building in response to these load determinations.

Abstract: Systems and methods to regulate the amount of outdoor air that is introduced into a building. These systems and methods determine the mechanical load requirements based on adaptive control functionality. These systems and methods utilize extremum seeking control logic to vary the flow of outdoor air into the building in response to these load determinations.

Abstract: A ventilation system for providing fresh outdoor directly to each floor through an intake damper on the floor and for admitting only as much air as is required to meet the required outdoor air requirements when the temperature of the outdoor is at extreme ambient temperatures. The system utilizes a compartment unit on each floor and a plurality of VAV's which are located in zones on the floor for achieving desired temperatures in each zone by combining the recirculating air with the outdoor fresh air for delivering to the VAV's at about 55° F.

Abstract: A static air mixing device is provided. The mixing device includes a rectangular array of louver systems. Each louver system includes a plurality of vanes defining through flow passages therebetween. The vanes are oriented to deflect incoming air in a direction toward an immediately adjacent louver system. The combination of louver systems effects vortex flow of air downstream of the static mixing device.

Abstract: Disclosed is a combination air purifier and ventilator. The air purifier in accordance with the present invention includes a case being provided on a ceiling or a wall and having a fan therein, a first passage communicating with an outside, an inside of the case and an room, having an air purifying member being provided between the inside of the case and the room, and guiding the external air into the room, a second passage communicating with the room, the fan, and the outside, and guiding the room air to the outside, and a damper provided in the case for isolating the first passage from the second passage for supplying the external air into the room and discharging the room air to the outside, or communicating with the fist and second passages to guide the room air drawn into the second passage back into the room after passing through the air purifying member.

Abstract: An air handling module for the air conditioning system of a motor vehicle is provided, including a housing having a first portion defining a first path and a second portion defining a second path and a conduit having first and second ends and an enclosed passageway there between. The conduit is positioned within the housing such as to at least partially connect the first path and the second path adjacent to the second end of the conduit.

Abstract: A cover plate device for a heat exchanger device, especially for a vehicle heater, includes a receiving zone (14) intended to be arranged on the heat exchanger device and to receive a fluid stream leaving the heat exchanger device in a first direction of flow (S1), a mixing zone (22) for mixing the partial fluid streams (F1, F2, F3) leaving the heat exchanger device in different areas and entering the receiving zone (14), and at least two delivery zones (24, 26) for delivering the fluid stream leaving the mixing zone (22) from the cover plate device (10).

Abstract: A mixer includes a fresh air tube defining a passage having an inlet receiving conditioned air from an air conditioning pack. The fresh air tube includes an outlet providing mixed air to a cabin of the aircraft. An outer tube at least partially surrounds the fresh air tube and receives recirculated air from the cabin. Multiple holes in the fresh air tube fluidly connect the outer tube to the fresh air tube. The warm recirculation air surrounds the portion of the fresh air tube to heat it preventing ice from forming. The warm recirculation air entering the fresh air tube through the holes homogeneously mixes with the conditioned air from the pack to provide a uniform mixture of air within the fresh air tube, which further ensures the prevention of ice build up.

Abstract: A fixed blade air mixing apparatus includes a plurality of radially extending vanes which extend away from a common center and terminate at their outer ends within a polygonal shaped enclosure. The plurality of vanes may include an inner section which is curved or pitched in one direction, and an outer section which is curved or pitched in a second direction away from the inner section, the inner and outer sections sharing a common leading edge. In another embodiment, the vanes extend straight without a curvature. The apparatus is intended for use in eliminating stratification of airstreams of different temperatures flowing through a common passage, for example, in heating, air conditioning, or other ventilating ducts. The vanes are designed to establish downstream turbulence of the airstreams passing therethrough which produces optimum mixing effectiveness and a uniform velocity profile of the air downstream of the mixing apparatus with a minimum pressure drop as the air flows through the apparatus.

Abstract: This system is for ventilating a housing or a housing portion that has to house a contents (39) and has ventilation grids (33, 35) for the contents, the grids being formed from segments of material leaving a gap between them, characterized in that these segments of material are arranged at at least two levels (9a, 9b) offset depthwise in the general direction of entry of a gaseous fluid into the housing or the housing portion through the grid in question, in order to constitute, by grid, a multiple-grid system, the grids being offset depthwise with respect to one another.

Abstract: A fixed blade air mixing apparatus includes a plurality of radially extending vanes which extend away from a common center and terminate at their outer ends within a polygonal shaped enclosure. The plurality of vanes may include an inner section which is curved or pitched in one direction, and an outer section which is curved or pitched in a second direction away from the inner section, the inner and outer sections sharing a common leading edge. In another embodiment, the vanes extend straight without a curvature. The apparatus is intended for use in eliminating stratification of airstreams of different temperatures flowing through a common passage, for example, in heating, air conditioning, or other ventilating ducts. The vanes are designed to establish downstream turbulence of the airstreams passing therethrough which produces optimum mixing effectiveness and a uniform velocity profile of the air downstream of the mixing apparatus with a minimum pressure drop as the air flows through the apparatus.

Abstract: An air handling system for a building having a ceiling and enclosed space, the system including four interconnected induction units for mounting adjacent the ceiling. These units form four sides of a rectangular assembly. Each induction unit includes an air plenum section and an air mixing section connected to a side of the air plenum section and forming an elongate air mixing chamber that extends downwardly to an air outlet. Supporting members mount the induction unit assembly at the ceiling so that each air mixing section when viewed in transverse, vertical cross-section extends at a substantial angle, which in a preferred embodiment is about 90 degrees, to the ceiling during use of the apparatus. Return air is drawn by venturi effect created by a fast flow of primary air into each air mixing chamber and heated or cooled at the heat exchanging coils. The units can provide a mixed air flow that flows downwardly from the outlets.

Abstract: A cover plate device for a heat exchanger device, especially for a vehicle heater, includes a receiving zone (14) intended to be arranged on the heat exchanger device and to receive a fluid stream leaving the heat exchanger device in a first direction of flow (S1), a mixing zone (22) for mixing the partial fluid streams (F1, F2, F3) leaving the heat exchanger device in different areas and entering the receiving zone (14), and at least two delivery zones (24, 26) for delivering the fluid stream leaving the mixing zone (22) from the cover plate device (10).

Abstract: A mixer box for mixing two separate sources of air. Air from a first source is fed into a plurality of vented conduits. Each of the vented conduits has at least one vent opening, that allows the air from within the conduits to escape and enter a mixing chamber. Air from a second air source flows into the mixing chamber around the vented conduits. As the second air source flows around the vented conduits, turbulence is produced that mixes the second air source with the first air source escaping from the vented conduits. Flaps are used to control the flow of the first source of air out of the vented conduits and the flow of the second source of air around the vented conduits.

Abstract: A fixed blade air mixing apparatus includes a plurality of radially extending vanes which extend away from a common center and terminate at their outer ends within a polygonal shaped enclosure. The plurality of vanes include an inner section which is curved or pitched in one direction, and an outer section which is curved or pitched in a second direction away from the inner section, the inner and outer sections sharing a common leading edge. The apparatus is intended for use in eliminating stratification of airstreams of different temperatures flowing through a common passage, for example, in heating, air conditioning, or other ventilating ducts. The vanes are designed to establish downstream turbulence of the airstreams passing therethrough which produces optimum mixing effectiveness and a uniform velocity profile of the air downstream of the mixing apparatus with a minimum pressure drop as the air flows through the apparatus.

Abstract: An air conditioner for a vehicle comprises an air conditioner housing and an air intake formed in the air conditioner housing. An evaporator is disposed downstream of the air intake and an heater core is disposed downstream of the evaporator. Vent and foot outlets are formed in the housing downstream of the evaporator. The air conditioner further includes a first passage defined between the evaporator and the heater core and a guide plate disposed downstream of the heater core for directing hot air heated by passing through the heater core toward cool air not passing through the heater core.

Abstract: An air mixer for an air distribution system for a building including a set of fixed, parallel partitions arranged in a spaced-apart manner with one above another, these partitions forming alternating primary and secondary air passageways that are capable of conveying first and second air flows respectively. These passageways are substantially open ended at both inlet and outlet ends thereof. The primary air passageways extend from a first side of the mixer to a third, outlet side while the secondary air passageways extend at a substantial angle to the primary passageways from a second side to the third outlet side. There are fixed mixing devices, preferably in the form of curved vanes, arranged at many of the outlet ends of the passageways. The preferred air mixer has a substantially triangular shape in plan view.

Abstract: An air-conditioning system alternately produces a cooled air stratum and a heated air stratum as viewed from an air outlet opening, and the guide length a1 of a first guide wall is set from 0.05 time or more to 0.5 times or less than the length L1. The guide length a2 of a second guide wall is set from 0.05 time or more to 0.5 times or less than the length L2. Consequently if the air mixing chamber has a small capacity (the length parallel to the direction of air flow), it is possible to mix the heated air and the cooled air sufficiently.

Abstract: An air mixer for an air distribution system for a building including a set of fixed, parallel partitions arranged in a spaced-apart manner with one above another, these partitions forming alternating primary and secondary air passageways that are capable of conveying first and second air flows respectively. These passageways are substantially open ended at both inlet and outlet ends thereof. The primary air passageways extend from a first side of the mixer to a third, outlet side while the secondary air passageways extend at a substantial angle to the primary passageways from a second side to the third outlet side. There are fixed mixing devices, preferably in the form of curved vanes, arranged at many of the outlet ends of the passageways. The preferred air mixer has a substantially triangular shape in plan view.

Abstract: An HVAC housing includes a novel structure to aid the mixing of hot and cold air downstream of the evaporator and heater core. A series of space, parallel, C shaped channels running transverse to the cold air stream and generally in line with the hot air stream act to smoothly constrict the cold air stream in the gaps between the outer surfaces of the channels, while hot air concurrently runs through the inside of the channels. As the cold air passes over the edges of the channel walls, hot air is drawn out and thoroughly mixed.

Abstract: An air-conditioning system alternately produces a cooled air stratum and a heated air stratum as viewed from an air outlet opening, and the guide length a1 of a first guide wall is set from 0.05 time or more to 0.5 times or less than the length L1. The guide length a2 of a second guide wall is set from 0.05 time or more to 0.5 times or less than the length L2. Consequently if the air mixing chamber has a small capacity (the length parallel to the direction of air flow), it is possible to mix the heated air and the cooled air sufficiently.

Abstract: An air handling system for an enclosed space in a building includes two induction units that can be mounted above a ceiling. Each unit has an elongate air plenum section and an air mixing section forming an air mixing chamber. Air nozzles extend into the air mixing chamber and are mounted on a side of the air plenum section. Each nozzle has an inlet end opening into an interior chamber of the plenum section. Each air mixing section has an air outlet formed at a lower end thereof and a side air inlet for permitting return air to flow into the mixing chamber. Each induction unit is mounted so that the air mixing section extends at a substantial acute angle to the ceiling with the air outlet positioned where the mixing section meets the ceiling. The return air is drawn by a venturi effect created by the nozzles into each mixing chamber.

Abstract: An air mixer for an air distribution system for a building includes a set of fixed, substantially parallel partitions arranged in a spaced-apart, side-by-side manner, these partitions forming alternating primary and secondary air passageways. The primary air passageways are open-ended and extend from a front side to a rear side of the mixer. Front end plates extend respectively across front sides of the secondary air passageways and each has elongate edge portions extending along two opposite longitudinal edges thereof. Each elongate edge portion projects beyond the plane defined by an adjacent one of the partitions. Air flow splitters are mounted in the secondary air passageways and each is connected to an adjacent pair of the partitions. These splitters in operation of the mixer turn incoming air flow that enters the secondary air passageways towards the front end plates.

Abstract: A ventilation unit for use with a heating or cooling system that is decentralized and does not require large conduits is disclosed. The system includes at least one fresh air intake; a fan operatively connected to the at least one fresh air intake for drawing air from outside of a space into the fresh air intake; and at least one ventilation unit located in the room. The ventilation unit includes a conduit defining an air passage having a first and second opposite ends, a diffuser operatively connected to the fresh air intake for outputting fresh air near the second opposite end of the conduit and for drawing ambient air from the room through the first opposite end. The ventilation unit also includes a heating element located downstream from the first opposite end inside the conduit.

Abstract: A mixing device for mixing two air flows has plural first flexible curtains disposed between first edge regions of alternate pairs of air guides, and a plurality of second flexible curtains disposed between second edge regions of alternate pairs of air guides. Moveable air guides in each pair may be moved to control the flow of air.

Abstract: This invention relates to an induction air handling unit of the type that uses a primary air flow to induce flow of secondary air through the air handling unit. It comprises an induction chamber (2) having an air flow entrance (22) and an air flow exit (23) and a nozzle (10) having an outlet (12) located within the induction chamber (20). The nozzle (10) is connected to a primary air flow that causes a secondary air flow to be induced through the induction chamber (20) via the entrance (22) and the exit (23). The nozzle (10) is characterized by the edge (12) forming an outlet that is of a scalloped shape. This has a dramatic effect on producing noise output from the nozzle (10).