I have the 120mm and 80mm 4 red LED Typhoon case fans. I need to know which direction the fan's airflow goes. The blades have one side curved in and the other curved out. Which way the air will flow?
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 500 times.
Re: How to determien which direction a case fan blows
If you look on the sides of the fan there will be two arrows on one of the sides indicating the direction of the airflow. Thanks and please take a moment to rate this answer with a fixya rating. Thank you.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Usually the red is +12 volts DC, the black is ground, the yellow is the tach sensor, and the blue is speed control. The fan will run at full speed off the red and black. The yellow and blue are of no use unless the motherboard is designed to use them.
Newegg.com one of the best pc websites. If its for the cpu be sure to get thermal paste, or for the computer case measure the old fan and order the same size, most common is 80mm & 120mm. Also make sure to get the right power connector. If its really small its a 2 or a 3 pin. If its really big like what plugs into the harddrives its a 4pin/molex connector.
Computer case fans for older computers were usually standard sizes of 80 millimeter or 92mm, maybe120mm. 25.4mm = 1 inch, so an 80mm fan is about 3 inches. Measure the diameter of the fan from the tip of one fan blade to the tip of the opposite fan blade. A 92mm fan is about 3 1/2 inches in diameter and a 120mm fan is about 4 3/4"
Again, these sizes are _nominal_, so whatever your measurement is closest to is what you need. You should be able to measure the rear fan from the outside back of the computer without taking anything apart.
The old addage "you get what you pay for".....It applies here. You can get 80mm to 120mm fans for under 20 bucks, but depending on how fast they have to spool up to keep the processor cool and how well their blades have been designed determines how loud they are, especially if they have been cheaply made....poor bearings and poor blade design equals noise. Bigger fans are actually a lot quieter because to move air they do not have to turn as many rpms. Get the biggest best made fan you can that will sit confortably in the case without interference. Also, download the little program called Speedfan, it will monitor fan speeds and system temps and make adjustments to the fans to keep them in the quiet range when possible.