Do\'s and Don\'ts

1	Pressure recovery
2	Spinning of air at inlet connection
3	Eccentric inlet flow
4	Bends on fan discharge
5	Inlet plenums
6	Motor Position
7	The correct fan for the application
8	Inlet Cones
9	Flexible connection to fan
10	Duct restrictions at fans
11	Turning vanes at sharp bends
12	Isolating vibrating fans
13	Guards
14	Obstructions at fan inlets
15	Obstruction at fan outlet
16	Transitions
17	Air flow dead zones
18	Roof ventilator short-circuiting of air
19	Prevailing winds
20	Back-draft shutters
21	Mounting of Roof Units to ductwork
22	Volume controle dampers
23	Attenuators in relation to bends
24	Attenuator position relative to axial fans
25	Attenuator position relative to axial fan
26	Flanking transmission
27	Louvres on Silencer Discharge
28	Louvres on Silencer Inlet
29	Airflow generated noise from silencers
30	Isolated walls
31	Acoustic sealing of silencers to achieve very low noise levels
32	Silencer position relative to centrifugal fans
33	Fan position relative to noise sensitive areas
34	Correct sizing of spring mounts
35	Short circuiting of vibration mounts
36	Isolation of roof mounted fans
37	Reduction of external noise generated from roof units
38	Reduction of internal Noise from non-ducted roof units
39	When noise generated by grilles could cause a problem
40	Changing direction of airflow

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