Wathai 12038 120mm x 38mm PWM Computer PC Case Fan 12V 4pin 5300rpm 230 CFM High Airflow Duall Ball CFM FG DC Brushless Cooling Fan

This is way better than a factory exhaust fan because it has PWM control. You can adjust fan speeds with CPU temperature or other temperature indicators in BIOS. It is a little noisy but not too much for me. I think its worth it, keeping the components cooler over a long time helps your computer components last longer.

No kidding around. These are fast fans. Literally sounds like my pc is about to take off down the runway. (When i first turn it on) good bearings and good hardware for mounting. Only thing is these are thick and not good for small areas.

Amazing airflow from this fan. Used to replace the malfunctioning fan in a magnavox mvh2000 heater. If youre getting the infamous E1 error code its most likely due to a bad fan. E1 means the unit is overheating due to insufficient airflow. This fan moves plenty of air out 9ft in front of the heater. For this application you have to create new mounting holes and swap the connector ends. Super simple upgrade that vastly improves the heaters performance. I must add that its not loud at all. Can hardly hear the fan when right next to my head. Installed with the heater in operation the only way you know its running is the warm air and the display readout. 👍👍 To help anyone out that might be working on the mvh2000, to remove the insert from the wood housing each caster has 1 extra long screw that passes through the wood into the metal. Slide the insert out and remove the side panel. The rest is self explanatory. Unplug the heater before any service to the unit. Be safe!

Works good but I had to reverse the wires

Great little fan. Moves a ton of air when you need it. Works with PWM 4 pin connector, but take note that this is a 2A fan. At 100% it will require a 2A pwm header, so make sure that your motherboard has one. For my MSI Tomahawk x870 board, I needed to use the CPU FAN header, which was the 2A header for my board. All other fan headers shared 1A.Make no mistake, if you're using this in your desktop It is very noisy above 50%.

First, this "12V" dc fan's manual casually mentions that it can be damaged if run more than 20% above 12V rated voltage. It's *remarkably* thoughtful to design it to survive at the lead-acid car battery voltage 14.4V since most people I know call a cigarette lighter plug "12v." Now I don't need to add voltage regulation before hooking it up to to my car (or my 10 x AA Ni–MH power pack that runs between 13v and 14v)!They even include instructions on how to swap the wires in their plug if you have different polarity on your device. (I also bought the "Dual Ball Centrifugal Fan High Airflow" model from the same manufacturer, and it's equally superb, but as a "reasonable quietness outweighs sheer air flow" alternative, which also works beautifully even mounted flat against a solid surface.)I *almost* wired a PWM controller sharing the same power source, but I was in a rush so I used a simple power PWM controller as the power source instead of a constant 12V with PWM signaling speed and, while it doesn't get the fan below 50% power, that level isn't terrible if you have something else making noise in the room, so in a pinch that's an option for many projects using the fan. For those who are less comfortable with the details of electrical engineering the my amatuer self (but somehow have a 12v pulse-width modulation power regulator hanging around?), I should note that I get extremely non-linear scaling behavior using it (cut-in around 5% to 10% pulse width), ramp up to about 80% fan speed at about 25% pulse width, and the remainder of the speed is spread over the last 75% of the pulse width. As I write this, I realize the relationship is probably roughly logarithmic starting at the cut-in and I suspect (since I don't want to rip apart one of my two favorite fans of all time) there's a cap or inductor or something smoothing out my pulses before they hit the brushless motor controller IC so it's just seeing a very dirty reduced input voltage when I have a PWM wired in.At 100% speed, it's about as annoying as a vacuum cleaner (not nearly as loud, but much more piercing and distinct overtones). At half speed, the annoyance is about the same as an air window conditioner unit.I cranked it up to 100% and verified the advertised speed and discovered as some (possibly useful) characteristics. I recorded the sound of the fan and found the fundamental resonant frequency is 600Hz, which divided by 7 for the seven blades making each revolution, is about 85 Hz, or (multiplied by 60 to convert Hz to RPM is) 3600 RPM.If you are still reading, you must be looking for something wrong with it. Sorry, I can't find a single thing to complain about. :-)

Powerful.

Deffenetly moves air