Fan replacement for Sony APR-5003V. 2012-03-24
- original fan: Panaflo, model: FBH-06A24L (Matsushita Electric)
- CBC replacement: ebm-papst, model: 614 NL, 60 x 60 x 25 mm, 24 VDC, 0.9 W, air flow: 21 m3/h, 12.4 cfm
- fan source: 2012-03-26: Mouser, part: 5912-614NL, $27.62
- http://www.mouser.com/ProductDetail/ebm-papst/614NL/?qs=%2fha2pyFadujDvSVFr3YAtdBKVM0tS%2f%252bMnz3KG%252byYu04%3d
- http://www.ebmpapst.com/en/products/compact-fans/axial-compact-fans/axial_compact_fans_detail.php?pID=53795
- noise levels
- stock Panaflo fan: 50.2 dB on a DEM/Extech meter
- replacement Papst 614 NL fan: 40.3 dB on a DEM/Extech meter
- Duck’s Sheet Metal, State College: punched a 70 x 70 mm opening in the perforated sheet metal back panel, to facilitate air flow
- John K. Chester's advice is to try the equivalent Papst 60mm fan first, recognizing that the "fan" sound is a by-product of whatever surfaces are closest to the fan blades; it may be that the new fan will be quieter by simply mounting the fan on the exterior of the power supply and cutting a hole in the perforated sheet metal cover.
- JKC notes that the most offensive noise from the fan is a distinct tone, but this noise is unlikely to be produced by interaction with metal mesh with small holes, as that will just produce some turbulence, which will sound like random noise. The tone will be caused by the interaction of the fan blades with large nearby objects, such as the support struts which hold the fan motor. Tone generation requires a large open space, let's say equal to the spacing between fan blades, and then a solid obstruction. The increase in pressure as the fan blade passes the obstruction creates the tone. If the fan is aimed at such an obstruction inside the power supply, increasing the distance between the fan and the obstruction should lower the level of the tone.
- CBC post to Yahoo Sony_APR group: 2015-08-16
Christopher Campbell
www.cbcampbell.com