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Designed by:
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Do's and Don'ts
Propriety information courtesy of FANTECH (Australia)
(NOT TO BE REPRODUCED.)
Pressure recovery
Spinning of air at inlet connection
Eccentric inlet flow
Bends on fan discharge
Inlet plenums
Motor Position
The correct fan for the application
Inlet Cones
Flexible connection to fan
Duct restrictions at fans
Turning vanes at sharp bends
Isolating vibrating fans
Guards
Obstructions at fan inlets
Obstruction at fan outlet
Transitions
Air flow dead zones
Roof ventilator short-circuiting of air
Prevailing winds
Back-draft shutters
Mounting of Roof Units to ductwork
Volume controle dampers
Attenuators in relation to bends
Attenuator position relative to axial fans
Attenuator position relative to axial fan
Flanking transmission
Louvres on Silencer Discharge
Louvres on Silencer Inlet
Airflow generated noise from silencers
Isolated walls
Acoustic sealing of silencers to achieve very low noise levels
Silencer position relative to centrifugal fans
Fan position relative to noise sensitive areas
Correct sizing of spring mounts
Short circuiting of vibration mounts
Isolation of roof mounted fans
Reduction of external noise generated from roof units
Reduction of internal Noise from non-ducted roof units
When noise generated by grilles could cause a problem
Changing direction of airflow
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