View source for Blowers/004 Blowers Application of forward curve blowers.pdf

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<span style="tab-stops:.5in"><span style="font-size:12.0pt"><span style="font-family:">Subject:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (4) Application of Forward Curve Blowers</span></span></span>

<span style="tab-stops:.5in"><span style="font-size:12.0pt"><span style="font-family:">Date:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 10/15/04</span></span></span>

<span style="tab-stops:.5in">''<span style="font-size:12.0pt"><span style="font-family:">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Revised June 6, 2005&nbsp; &nbsp;&nbsp;</span></span>''</span>

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<span style="tab-stops:.5in"><span style="font-size:12.0pt"><span style="font-family:">All twin forward curve blower assemblies shall be designed to require only '''two''' outboard bearings.&nbsp; The required shaft size may be determined using the <st1:place w:st="on"><st1:city w:st="on">Delhi</st1:city></st1:place> shaft selection program.&nbsp; Single forward curve blowers shall be purchased as an assembly from the manufacturer whenever possible.&nbsp; All forward curve blowers shall be class II construction.&nbsp; All forward curve blowers shall use “grip-tite” adapter bearings.&nbsp; Set-screw bearings shall no longer be used.</span></span></span>

<span style="tab-stops:.5in"><span style="font-size:12.0pt"><span style="font-family:">Whenever using a forward curve blower to discharge into a coil (or filters, heating device, etc.) with a face area larger than the fan outlet area, a perforated baffle plate on the outlet of the blower should be used to better distribute airflow.&nbsp; Baffle plates are to be shown on the dimensional data drawings and should also be listed in the DRAFTING NOTES section of the Engineering file ACTIVITY LOG.&nbsp; Blowers should also be located with a clearance of at least one blower wheel diameter to the blower inlet.&nbsp; Outlet clearances should be as large as possible, with a typical minimum of 1.5&nbsp; to 2 times the blower wheel diameter.</span></span></span>

<span style="tab-stops:.5in"><span style="font-size:12.0pt"><span style="font-family:">In some applications it may be necessary to make exceptions to the above guidelines.&nbsp; All exceptions shall be approved by the engineering manager.</span></span></span>