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© FANTECH

2016

Attenuator

Flanking transmission

Figure 4.12. - Flanking transmission

Attenuator

If an attenuator is installed as shown, noise from the fan can

bypass the attenuator and enter the conditioned space. This is

known as flanking transmission and will negatively impact on

the expected attenuator performance.

Installing the attenuator through or against the wall minimises

the chance of flanking transmission via the duct system

ensuring the expected performance is achieved.

4.0 NOISE CONTROL (Cont.)

Figure 4.11. - Fan position relative to noise sensitive areas

INSTALLATION DO’S AND DON’TS

INSTALLATION DO’S AND DON’TS

P-16

P

Overlap wrap by

100mm at all joins

Best

Storeroom

Better

Do not place fans in ceiling spaces directly above noise

sensitive areas.

Better: Do place fans in ceiling spaces away from noise

sensitive areas.

Best: If fan cannot be relocated, wrap fan and surrounding

ductwork with a noise barrier material (When wrapping fans pay

particular attention to ensuring there are no holes at the joins).

Allow sufficient overlap in the wrap to ensure adequate coverage.

Remember that flexible connections will be the weakest link.