UPS FAN Replacement

[Snir36]

Hi,

I have ups with "HK FAN AS8025H12 DC BRUSHLESS FAN" with 4 wires and it noisy.

I cant find the datasheet of this fan.

my question is if i can replace this fan with Nocatua NF-A8 PWM?

Does the fan fit the specs of the old fan?

(Attached picture of the fan)

[Mojo-Jojo]

You're probably fine. The Noctua has a much lower rated current so it will probably draw less power. And let's be honest, it's Noctua. So even at lower power, it'll probably be more efficient at moving air.

 

 

I can't find too many specs about the HK fan, RPM-wse.

[Windows7ge]

It runs on the same voltage and draws less current. Fan is the same dimensions only concern ares you might have to modify the power connector.

 

There's a slight chance the UPS might monitor the fans RPM and complain in some way but I can't say that for sure.

 

The UPS will also run hotter given the difference in amps tells me no difference in blade pitch/design is going to move an equal amount of air.

 

How often does the unit turn on to where it's bothering you?

[Snir36]

20 hours ago, Windows7ge said:

It runs on the same voltage and draws less current. Fan is the same dimensions only concern ares you might have to modify the power connector.

 

There's a slight chance the UPS might monitor the fans RPM and complain in some way but I can't say that for sure.

 

The UPS will also run hotter given the difference in amps tells me no difference in blade pitch/design is going to move an equal amount of air.

 

How often does the unit turn on to where it's bothering you?

All time.

20 hours ago, James Evens said:

You can't just slap Noctua into every device and assume it will be enough airflow.

 

6W HK-fan for sure will either move more air and/or higher static pressure than an 0.960W Noctua. That's roughly an 5x in power consumption difference which is far more fan above average fan design can make up for.

 

For comparision an random delta 80mm 6W fan: AFB0812SH

airlfow: 78 m^3/h

pressure: 6.76 mm*H2O

noise: 40db

 

Noctua NF-A8 PWM:

airflow: 55.5 m^3/h

pressure: 2.37 mm*H2O

noise: 17.7 db

 

In this particular example? You might get away with the approx 1/3 reduction in airflow if the system requires very little static pressure. As soon as there is some resistance this Noctua will fail miserably and you will look at like more then 80% reduction in airflow.  In other words this UPS might overheat or will be on the edge of overheating/very early failure due to higher operational temperatures.

Do you know quiet fan the meet the specs i need?

[Windows7ge]

2 hours ago, Snir36 said:

All time

What is all time? If you need a portable electric source a UPS isn't designed for constant use. Look at car batteries and Inverters 

[Snir36]

2 hours ago, Windows7ge said:

What is all time? If you need a portable electric source a UPS isn't designed for constant use. Look at car batteries and Inverters 

the ups is in my room. 

[Windows7ge]

20 minutes ago, Snir36 said:

the ups is in my room. 

How often do you get power outages and how long do they typically last?

[Snir36]

17 hours ago, Windows7ge said:

How often do you get power outages and how long do they typically last?

It is online ups so it work all time.