# US 8,783,413 B1 · Tuned shunt tubes for climate control air-handling systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,413 B1 - Document ID: US8783413B1 - Status: Granted - Kind: B1 - Application number: 13/799,053 - Filed: 2013-03-13 - Granted: 2014-07-22 - Earliest claimed: 2013-03-13 - Assignees: DENSO International America, Inc. - Applicants: DENSO International America, Inc. - Inventors: Prakash T. Thawani; Steve Sinadinos; Justin Black - Web page: https://patentgrep.com/patent/US8783413B1 ## CPC - F24F 13/24: Means for preventing or suppressing noise - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract The present teachings provide for an airflow sound suppressor, such as for an HVAC assembly, for example. The sound suppressor includes a first end configured to be mounted to a first surface of the HVAC assembly. A second end of the sound suppressor is configured to be mounted to a second surface of the HVAC assembly. An elongated portion extends between the first end and the second end. The elongated portion defines a passageway therethrough that extends an entire length of the sound suppressor. ## Claims ### Claim 1 An airflow sound suppressor for a heating, ventilation and air cooling (HVAC) assembly, the airflow sound suppressor comprising: a first end of the sound suppressor configured to be mounted to a first surface; a second end of the sound suppressor configured to be mounted to a second surface; and an elongated portion extending between the first end and the second end, the elongated portion defining a passageway therethrough extending an entire length of the sound suppressor; wherein the first and the second mounting surfaces are selected from a plurality of mounting surfaces at an exterior surface of the HVAC assembly defined by a plurality of weakened portions of the exterior surface. ### Claim 2 (depends on 1) The sound suppressor of claim 1, wherein the elongated portion is a flexible tube. ### Claim 3 (depends on 1) The sound suppressor of claim 1, wherein the elongated portion is generally U-shaped. ### Claim 4 (depends on 1) The sound suppressor of claim 1, further comprising retention members at both the first end and the second end configured to secure the sound suppressor to the HVAC assembly. ### Claim 5 (depends on 1) The sound suppressor of claim 1, further comprising a coupling member configured to couple with both the HVAC assembly and the sound suppressor to connect the sound suppressor to the HVAC assembly. ### Claim 6 (depends on 1) The sound suppressor of claim 1, wherein the elongated portion is sized and shaped to accommodate airflow therethrough and to suppress tones in the range of 500 Hz to 1,500 Hz. ### Claim 7 (depends on 1) The sound suppressor of claim 1, wherein the sound suppressor is color coded to distinguish it from other sound suppressors having different dimensions. ### Claim 8 A sound suppressor for a heating, ventilation, and air cooling (HVAC) assembly comprising: a first end of the sound suppressor mounted to the HVAC assembly at a first aperture in a first mounting surface defined by the HVAC assembly; a second end of the sound suppressor mounted to the HVAC assembly at a second aperture in a second mounting surface defined by the HVAC assembly spaced apart from the first aperture; and a flexible elongated portion extending from the first end to the second end, the flexible elongated portion defining a passageway therethrough extending an entire length of the sound suppressor; wherein the first and the second mounting surfaces are selected from a plurality of mounting surfaces at an exterior surface of the HVAC assembly defined by a plurality of weakened portions of the exterior surface. ### Claim 9 (depends on 8) The sound suppressor of claim 8, wherein the elongated portion includes a first curved portion and a second curved portion. ### Claim 10 (depends on 8) The sound suppressor of claim 8, wherein the sound suppressor is a flexible tube. ### Claim 11 (depends on 8) The sound suppressor of claim 8, further comprising a first retention member at the first end and a second retention member at the second end, the first and the second retention members couple the sound suppressor to the HVAC assembly. ### Claim 12 A method for suppressing a target sound of an airflow assembly comprising: selecting a flexible sound suppressor tube defining an airflow passageway from a plurality of flexible sound suppressor tubes having different dimensions based on location and frequency of the target sound to be suppressed; selecting a first mounting location on the airflow assembly for mounting a first end of the flexible sound suppressor tube and selecting a second mounting location on the airflow assembly for mounting a second end of the flexible sound suppressor tube based on the location and frequency of the target sound; and mounting the first end of the flexible sound suppressor tube to a first aperture of the airflow assembly at the first mounting location and mounting the second end of the flexible sound suppressor tube to a second aperture of the airflow assembly at the second mounting location to permit airflow of the airflow assembly to pass through the airflow passageway and suppress the target sound; wherein the airflow assembly is a heating, ventilation and air cooling (HVAC) assembly; and the first and the second mounting locations are selected from a plurality of mounting locations at an exterior surface of the HVAC assembly defined by a plurality of weakened portions of the exterior surface. ### Claim 13 (depends on 12) The method of claim 12, wherein the plurality of flexible sound suppressor tubes have different lengths. ### Claim 14 (depends on 12) The method of claim 12, further comprising removing a first weakened portion of the plurality of weakened portions at the first mounting location to open the first aperture, and removing a second weakened portion of the plurality of weakened portions at the second mounting location to open the second aperture. ### Claim 15 (depends on 12) The method of claim 12, further comprising mounting the first end of the flexible sound suppressor tube to the first aperture with a first coupling member and mounting the first end of the flexible sound suppressor tube to the first aperture with a second coupling member.