Sound attenuator for low frequencies, in particular for air duct

Details Sound attenuator for low frequencies, in particular for air duct Sound attenuator for low frequencies, in particular for air duct

1992-01-13

1993-12-07

Gellner, Michael L.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181243, E04F 1704

Patent

active

052685411

ABSTRACT:
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 several attenuator members to be replaced for cleaning and/or servicing of the sound attenuator and/or of the attenuator members.

REFERENCES:
patent: 2916101 (1957-12-01), Naman
patent: 2994401 (1961-08-01), Bourne et al.
patent: 4091892 (1978-05-01), Hehmann et al.
patent: 4167986 (1979-09-01), Conway
patent: 4236597 (1980-12-01), Kiss et al.
patent: 4287962 (1981-09-01), Ingard et al.
patent: 4787473 (1988-11-01), Fuchs et al.

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