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| Number | Title | Issue Date |
| 8043148 | Noise suppressing damper A damper is provided to suppress the abnormal noise or air noise at the small opening of the damper. The damper includes a wall surface which forms an air flow passage, a stationary portion which extends from the wall surface to the center of a flow passage, and a r... | 10/25/2011 |
| 7334662 | Equipment enclosure acoustical door with low impedance distributed air flow An acoustic door for an equipment enclosure, such as a rack mount cabinet, also provides a low impedance air flow uniformly delivered across the cabinet opening. A pair of metal panels, with acoustic foam along the rear surfaces, extend angularly outward and toward ... | 02/26/2008 |
| 7243757 | Exhaust muffler An exhaust muffler (1) invention includes an entry chamber (9), a resonator chamber (15), and a baffle chamber (23) positioned in serial order between an exhaust gas inlet (3) that lets exhaust gas into the entry chamber and an exh... | 07/17/2007 |
| 7059958 | Elevator cabin with integrated ventilation system An elevator cabin with an integrated ventilation system. A fan is attached to the elevator cabin and a vertical side wall of the elevator cabin has a plurality of distributed ventilation holes. At least one air channel element is attached to the side wall, so that t... | 06/13/2006 |
| 7013969 | Low noise level HVAC system having displacement with induction A displacement ventilation, low noise level, mixed air, HVAC system for ventilating a commercial or educational facility. The system includes a central HVAC air handling unit containing first and second duct works for receiving and transmitting conditioned air to ro... | 03/21/2006 |
| 6971474 | Air guiding element, especially an air guiding channel for a motor vehicle An air conduction element (1), particularly an air conduction channel for a motor vehicle, having a reverberant channel body (2) manufactured from plastic, which has at least one wall region replaced by a sound-absorbing component (10, 11), the ... | 12/06/2005 |
| 6953104 | Muffin fan hush hood A low noise method and apparatus with the apparatus including a hood for mounting over an exhaust outlet duct to capture a fluid stream and then redirect the fluid stream to a fluid outlet in the hood through the use of smoothly curving duct that maintains the fluid... | 10/11/2005 |
| 6945355 | Muffler arrangement for a flow duct A muffler arrangement includes muffler elements arranged in rows which are oriented in each case transversely to a direction of flow. The muffler elements themselves are oriented in each case longitudinally in relation to the direction of flow. The distance between ... | 09/20/2005 |
| 6920959 | Inlet and outlet duct units for air supply fan Duct units for delivery of air to an air supply fan and for connecting this fan to an air heater unit are disclosed. The duct unit for delivering air in one version has a narrow first section, a second, transition-type section and a wide sound attenuating, third sec... | 07/26/2005 |
| 6637168 | Aircraft engine run-up hangar An aircraft engine run-up hangar comprises a building defining a test chamber capable of receiving an aircraft therein, an air inlet structure, and an exhaust structure. The air inlet structure is formed in a front end part of a roof structure correspondi... | 10/28/2003 |
| 6622818 | Sound attenuating device An improved sound attenuating device for use in a gas transportation duct, said device comprising a core of acoustically absorptive material substantially enclosed within an impervious film to prevent direct contact between the acoustically absorptive mat... | 09/23/2003 |
| 6210268 | Air mixer for static mixing of two air streams The air mixer defined herein serves for static mixing of a heated air stream in a flow channel of a circulated air stream upstream of a heat treatment chamber for drying textile goods or tissue webs for example. For this purpose the air mixer is provided ... | 04/03/2001 |
| 5413530 | Device for controlling temperature in a room A device for regulating the temperature in a room having an extraction vent and a delivery vent, using pulsed low-velocity air flow (qs). A pipe is provided in communication with a pressurized air supply duct via extraction and delivery orifices, and the ... | 05/09/1995 |
| 5135161 | Reduced noise trim air system Audio noise created by trim valves (66a-72a) in a warm air trim system (24) of an air cycle air conditioning system (10) is reduced by controlling the pressure drop across the trim valves as a function of the position of the valves (66a-72a). A proportion... | 08/04/1992 |
| 5085057 | Dual side discharge room air conditioner with foamed insulation air passage walls A room air conditioner in which a blower housing is formed of a foamed insulation material. The foamed insulation material is formed in three separate pieces with each of the pieces fitting together to form a single structural unit forming the blower hous... | 02/04/1992 |
| 4726563 | Low frequency noise and turbulence reducer Low frequency noise and turbulence are reduced in a damper structure by providing a perforate screen extension onto the damper blade so as to extend across the flow path when the damper is open. Additionally, a perforate screen is located immediately down... | 02/23/1988 |
| 4335797 | Noise suppression arrangement for engine enclosures An engine enclosure (10) has a noise suppression arrangement (15,15a,15b) mounted thereon including a plurality of acoustical energy absorbers (20,20a,20b) and sound reflectors (24,24a,24b) spaced from the absorbers to provide airflow passages (26,26a,26b... | 06/22/1982 |
| 4319521 | Air distribution system An air distribution system for a building including a mixing plenum for receiving and mixing outside and return air. An input flow concentrator and integral silencer is disposed within and coupled to the mixing plenum. The flow concentrator and integral s... | 03/16/1982 |
| 4295416 | Air distribution system An air distribution system for a building including a mixing plenum for receiving and mixing outside and return air. An input flow concentrator and integral silencer is disposed within and coupled to the mixing plenum. The flow concentrator and integral s... | 10/20/1981 |
