How do you change the speed modes? Can it be done without a PC?

You can only change the fans speed with the physical button located at the center of the fan. It has three fans speed modes. If your PC is roomey, you can change fan speed while it's ON. From my experience, I found the second speed mode the best. The third is the fastest, but it gets extremely loud and doesn't change much airflow from the second speed mode.

I was wondering what the Watt and Amp draw are on these? My mobo fan pins are only rated at 1 amp and 12 Watts. These look to be decent, but I don't want to burn out my fan connectors.

You might be able to get away with it on the lowest setting. I have mine plugged directly into the Molex PSU connector. Using it as the push fan on an evo 212, I think I set it at the lowest rpm, which still pushes more cfm and static pressure than the 212's stock fan.

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Enermax; UCTS12A;UCTS12A TwisterStorm datasheet_en - Megekko.nl

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ENERMAX UCTS12A Twister Storm UCTS12A 120mm Case Fan

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Performance: 1500 Overclocking: 2500 Turbo: 3500 Performance: 72.46 Overclocking: 115.75 Turbo: 154.53
Performance: 23 Overclocking: 30 Turbo: 38

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Learn more about the ENERMAX UCTS12A

Model
Brand	ENERMAX
Model	UCTS12A

Details
Type	Case Fan
Compatibility	Case
RPM	Performance: 1500 Overclocking: 2500 Turbo: 3500
Air Flow	Performance: 72.46 Overclocking: 115.75 Turbo: 154.53
Noise Level	Performance: 23 Overclocking: 30 Turbo: 38
Power Connector	3 Pin
Color	Black

Features
Features	3500 max rpm industrial grade performance Shift Speed Control offers 3 speed modes for various applications Storm-flow blades generate +30% airflow and enhance airflow momentum Patented Twister Bearing for long lifespan and low operation noise Detachable blades for easy cleaning Isolator-mounts for shockproof and easy installation

Dimensions & Weight
Dimensions	120 x 120 x 26.4mm

Package Contents
Package Contents	4 x screw , 4 x Isolator-mounts, 1 x 4 pin fan power adaptor

Additional Information
First Listed on Newegg	January 22, 2015

ENERMAX UCTS12A Twister Storm UCTS12A 120mm Case Fan

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Customer Reviews of the ENERMAX UCTS12A

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Item#: N82E16835214060

ENERMAX UCTS12A Twister Storm UCTS12A 120mm Case Fan

Learn more about the ENERMAX UCTS12A

Customer Reviews of the ENERMAX UCTS12A

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Manufacturer Contact Info