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Photo 18: The draw<strong>in</strong>g of PA fan is seen here. The <strong>in</strong>let box seemed to be small as compared to<br />
fan impeller size. Moreover IGV comes <strong>in</strong> the p<strong>at</strong>h of air flow <strong>at</strong> high velocity zones. The IGV<br />
could block the air flow <strong>in</strong>stead of swirl<strong>in</strong>g it.<br />
700x1800<br />
700x1530<br />
125<br />
400<br />
6<br />
400<br />
355x800<br />
225<br />
158<br />
255<br />
365<br />
350<br />
850<br />
Ø950<br />
1,700<br />
Ø810<br />
Ø1,428.5<br />
175<br />
750<br />
425<br />
350<br />
865.5<br />
400<br />
Figure 1: The PA fan <strong>in</strong>let box was found to be too small <strong>in</strong> comparison with a better<br />
perform<strong>in</strong>g PA fan of almost same design parameters. Small suction box with IGV would work<br />
as sharp ell duct <strong>in</strong>stead of uniformly distribut<strong>in</strong>g suction box.
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