Fans by Fantech Electronic Catalogue

2016

Figure 4.16. - Reduction of Internal Noise from non-ducted roof units

When the fan could exceed the internal background noise, and

a quieter fan is not available for selection.

Caution: No Acoustic treatment.

Place an acoustic baffle below the fan inlet / discharge.

4.0 NOISE CONTROL (Cont.)

Figure 4.15. - Reduction of external noise generated from roof units

INSTALLATION DO’S AND DON’TS

P-18

Better

Drainage gap

Best

In-line Centrifugal

When generated noise could be a problem, and a quieter fan

cannot be selected.

Caution: No acoustic treatment.

Better: Replace windband of fan with silencer.

Best: Change to an inline fan running parallel to the roof, and

place a rectangular silencer on the outdoor side. Direct the duct

opening away from noise sensitive areas.