Sound absorbing arrangement for air handling units

Details Sound absorbing arrangement for air handling units Sound absorbing arrangement for air handling units

1982-01-07

1984-02-21

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181224, 181296, F01N 124

Patent

active

044324340

ABSTRACT:
An arrangement for attenuating noise in an air handling unit having a forwardly curved centrifugal fan and dampers downstream of the fan for varying the volume rate of air flow. The dampers are located downstream of the fan a distance L which is about 30 inches so that the critical acoustical frequency f=C/4L is relatively high (125 Hz). The discharge section of the air handling unit between the fan and the dampers is lined on the sides with acoustical panels that are effective in absorbing sound at the critical frequency.

REFERENCES:
patent: 1964845 (1934-07-01), Dietze et al.
patent: 3554112 (1971-01-01), Herb
patent: 3949830 (1976-04-01), Muehlbauer et al.

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