[Dr_Strangelove]

Ok that makes total sense BillA, sorry if I was not understanding your point before.

Here is what I found as far as spec for the Panaflo:
# Fan Size: 120 x 120 x 38mm
# Airflow – 86.5cfm
# Noise – 35.5dba
# Static Pressure - 4.80 mm-H20
# Rotation Speed - 2100 RPM
# Connector - tailed w/ 3 pin connector (no rpm sensoring).
# Bearing Type - Hydro Wave
# Power Consumption - 4.08 watt
# Current Draw - 0.45 amp
# Rated Voltage – 12 Volt
# Operating Voltage - 7 ~ 13.8 Volt
# Panaflow Part Number: FBA12G12M

And this is the spec for the Sanyo:
Part Number............................. 109R1212H1011
Manufacturer............................ Sanyo Denki Co., Ltd., Japan
Size, In........................................ 4.73" X 4.73" X 1.50"
Size, mm..................................... 120mm x 120mm x 38mm
Voltage........................................ 12 volts DC
Operating Range............................. 10.2 - 13.8
Current......................................... 0.52A
Watts............................................ 6.24
RPM ............................................. 2600
Flow CFM (Max)............................ 102.4 CFM / 2.9 cu metre[m3]
Noise (dBA).................................... 39.0
Bearing Type................................... Dual Ball Bearing
Material-Venturi............................... UL94V-0 Plastic
Material-Propeller............................. UL94V-0 Plastic
Life Expectancy-MTBF....................... 60,000 Hours


Now my deduction was that 39dbs at 12v with 2600rpm should drop to about 33-35dbs at 9V with around 2100-2300rpm.


My question to you BillA is "How do you feel about the noise of the Panaflos you are currently using?"

Here is what I have read on several sites selling this fan: "They are amazingly QUIET for a 120mm fan and in our opinion, are even better than the extremely popular PANAFLO FBK12G12LH we offer."

Now I have no experience with either of those fans so my point of reference is not exactly there.