|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||181/224 ; 181/243|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 22 인용 특허 : 0|
The inventions concerns a sound attenuator for low frequencies for air-conditioning ducts, in particular for intake-air and/or exhaust-air ducts in paper mills. The sound attenuator comprises a frame whose flow duct substantially coincides with the air-conditioning duct and in which frame there is at least one plane attenuator member parallel to the flow direction and comprising one or several attenuator units operating by the Helmholtz and/or plate resonator principle. The attenuator member or members are fitted in the frame singly or as a group of seve...
A sound attenuator for low frequencies for air-conditioning ducts, comprising a frame, said frame having a flow duct arranged such that it can substantially coincide with an air-conditioning duct, said frame further comprising at least one attenuator member having a top and bottom edge, and a planar face arranged such that it will be parallel to the flow direction of air when arranged in the air-conditioning duct, said at least one attenuator member comprising one or several attenuator units structured to operate by the Helmholtz and/or plate resonator p...