Replacing the fan in ReadyNAS Duo - possible?

Ennio wrote:

Ennio,

This isn't a good way to do it, because the hub (center/motor) of your large fan is blocking nearly all of the vent slots for the 60mm fan. You are just pulling air through the tiny sliver visible around the hub, and the old screw holes. The blades up against the flat sheet metal don't do much of anything.

A somewhat better fix is a conical spacer that fits between the motor and the back frame. There are 60mm to 80mm spacers, and 80mm to 120mm spacers. Stack them up to use a 120mm fan.



80-120mm Fan Adapter Translucent Plastic UV Sensitive Blue, $3.95
http://www.coolerguys.com/840556056423.html

Funnel 60 to 80mm Fan Adapters, $2.49
http://www.coolerguys.com/840556017172.html


There are three other issues to be addressed.
1. New fan should at least be of equivelant CFM to original fan to keep same cooling level
2. New fan Amperage should not exceed original fan or you may overheat/damage the power supply
3. Unknown if the Duo actually monitors SPEED or just MOVEMENT.

Some fan tachometers only care that it spins and not how fast, in a simple sort of "IS IT WORKING?" test. Actual speed control is varying the power and not caring about realtime speed measurements.

Some smart controllers monitor speed and vary the power to get to the desired RPM. This is where a large fan is going to be a problem. If the tiny whizzy fan spins at 4000 RPM, the large fan only needs 2000 RPM or less to match that. But if the top speed is only 2000 then the system will read it as constantly underspeed and keeps trying to increase speed, hence the fan always runs at top speed and never slows down.