how to tell which direction a pc fan blows

Though you might not expect to need to change a vent fan's direction, this could become a necessity. The airflow depends on the design of the fan but will always follow the 2 rules above, guaranteed. Should the fans be set to blow air through the radiatior and out to the top of the case? Therefore, unless the power polarity is reversed, it will blow air forward. Want to know how much energy a fan can save? A simple but classic box fan like this popular Lasko 3720 model produces a soothing and calming “white noise” that can improve your quality of life. Ideally, your computer should suck and blow at the same time. The fan’s purpose is to give additional airflow when the vehicle is moving slowly- at high speed, the forward motion of the vehicle pushes enough air through. How do most people have it? I enjoyed the read. Archived. That’s because a fan always has the same basic design in one form or another: fans use angled and slightly curved blades to cut through the air and force it forward or backward depending on the direction of rotation. It’s honestly amazing how versatile they are. I apologize for some of the rude comments. A fan’s direction is often fixed and largely determined by what it was designed to do: Most common home fans used for cooling like this Lasko 3720 window box fan are designed to blow only one direction: forward. That’s because DC power can change the operation of the electric motor inside the fan, causing the blades to spin in the opposite direction and force air to the rear. I'm a do-it-yourself fanatic from Atlanta, Georgia. 2. Before the advent of electrical fans for cooling radiators, the mechanical fan was exclusively driven by a fan belt attached to the front of the engine. If a blade is angled down and the fan turns in the same direction as the blade angle, it will blow forward. Find out how much electricity an air conditioner uses vs a fan here. Right now, they are set as intake fans, so they blow air in, and not out. In fact, I personally verified the information and examples in this article with actual fans rather than make assumptions as you did in your comment. Fans are everywhere it seems! Neutral pressure – Air pressure in the case is equal to air pressure outside of the case. Common PC case (and other) fans are not standardized. While it’s not as common, some fans do have a marking indicating which way they blow. I have 5 enormous fans constantly blowing away on my unit. Does It Matter Which Room You’re In? Grant I'm debating flipping the exhaust or CPU fan, but like I said, I cannot tell which direction it's spinning. Changing the direction of your ceiling fan in the summer and winter not only makes you feel comfy, but it also allows you to adjust the thermostat and give your AC or heating unit a much needed break (your wallet will also get some much-needed rest, trust us). Try to keep the air flow in your case going in one general direction, with more fans blowing in that blowing out. How can I know on which direction should I set the new one to run. should the fan blow air into the freezer or draw air into the coils? If not, I’m thoroughly confused. Left: This fan is the most common type, as it can be mounted backward if you need to reverse airflow. some of the best box fans for white noise you can buy. Generally, you want the case fans in front of the case drawing in air while the fans at the rear blow air out. Wanted to connect it only in hot weather. Box fans are especially helpful for this. While many variations of fans exist, nearly all fall into just a few basic categories as the most important design principles are the same. Great article. One side it will obviously be blowing and pushing your hand away. Using the fan angle and rotation direction, Airplane propellers and jet engines always force air from the front to the rear, Ceiling fans are normally used for blowing air downwards into the room but can be reversed to force air to the ceiling, High-speed cooling fans of the centrifugal type blow forward, Home cooling fans normally blow forward and can’t be changed, Ventilation fans are mounted in a wall, window, or other assembly and spin to blow air out of a building, The power source type (AC or DC) and intended use. The way I think of this is to ask the question as to what is the leading edge of the blade as it rotates? it is also advisable to place them on different ends. With the simple flip of a switch or tug of a chain, you can start saving costs on your heating and air conditioning bills. That adds up over time! It’s best to run the fan on a low speed so that it doesn’t create too much of a cooling breeze. My engineering background helps me with my hands-on product research and testing. Then I thought of putting a computer fan on the desk for hot summer days but I couldn't tell from the picture in which direction the fan would rotate. I currently have my swifttech 220 radiator with Yate loom Mediums sucking behind the radiator in to the case. save. Just remember these basic tips: Do you have suggestions, more questions, or wish I covered some topics in more detail? If the fan’s direction is reversed, the air will go the opposite direction as it would be forced downward (towards the rear) instead of the front. So you mount the fan in the direction you want the air to go. This morning i stripped the PC to clean out all the dust. 2. Air will blow in the other direction (towards the back). (the side with the guard/motor support) you can have the front end blow cool air in, while the back fans blow hot air out. How to tell which direction fans are blowing. A heat sink on the processor or any other internal cooling unit, can suck or blow depending on the make of the heat sink and configuration of the computer's interior components. So on a 3 pin connector, do I just switch the places of the left and the right pin? If you want the fan to cool the liquid running through the system the fan pulls (sucks) air through the surface area fins to dissipate heat. No. They also keep air circulating within a room, offering a continual effect that makes you more comfortable. If if higher on the side it's probably meant to exhaust while a low side fan is probably meant to suck in cool air and blow it on the MOBO. Or, you could watch the fan as your computer is powering off (the fan accelerates too fast due to electricity as it's starting up which makes it impossible to tell unless you're Ted Williams, but when it's slowing down, it's just friction and some magnets). I didn’t have any luck finding anything besides that. Would it pull the air from the back or from the front? Here are 3 ways to tell which way a fan blows: The direction a fan blows air is always determined by (A) the shape of the blades (sometimes called propellers) and (B) the direction they turn. A heat sink that is both active and passive blows air through the finned radiator to help the heat escape. The fins on a fan sort of "scoop" the air up so if the fins are curving away from you then the air will blow towards you. The great news is that generally speaking it’s easy to tell fan air direction if you know what to look for. Here’s a great example of how to decide which way a fan blows. The Intake-exhaust direction should go front-to-back and bottom-to-top. A ceiling fan that spins clockwise will draw cooler air up and force warmer air near the ceiling down and out toward walls. Centrifugal fans can only blow air radially outwards. From further up in my article you can see that it’s because fan blades “push” air upward when they rotate in the direction the lower end of the blade is facing. 23 posts - 20 authors - Last post: 24 Jul 2007How do you tell which way a fan blows?. Keep the fan direction in mind when you’re looking to cool down or warm up a room. Even tiny PC fans are optimized for aerodynamics and quietness. Standing alone, the blow side of a fan does produce a more concentrated, faster moving, and more turbulent "river" of air compared to the intake side where air is drawn almost equally from all directions. By simply adjusting your ceiling fan direction, you can warm your home in those frigid winter months. Thread starter devilchrist; Start date May 9, 2008; May 9, 2008 #1 D. devilchrist Weaksauce. This fan works as an intake fan for the PSU that sucks in air and blows it on the components inside the PSU, where then it exits from the rear vents of the power supply. Electric fans can run and help cool you and your room with up to an amazing 60% less power than air conditioning units! (can't test as waiting for motherboard). Do they make a fan (like the Centrifugal) that blows downward and the intake is from the side, not the top? High heat build up, high head pressures, inefficient is an understatement. Try checking that. It should draw air through the radiator from front to back. Which direction is the evaporator fan supposed to spin? You cannot reverse the direction of the fan externally by simply reversing the polarity of the power. Question- I have the corsair H110 mounted EXACTLY as shown in the picture, (top-mounted) with the fans mounted to the bottom of the radiator. Likewise, if the blade is angled down and the fan turns the opposite direction, the reverse is true. The only problem is i cant remember which way the rear case fan was facing. Here’s an animated image I’ve put together to help show this. Infographic – Fan facts and airflow basics, How to tell which way a fan blows – 3 basic methods. Air conditioning units do so by removing heat from the air. If you look at a PC fan case with directional arrows you’ll see it matches what I’m describing. Or is it up to the manufacturer to decide? The example shown most certainly is correct. In both cases, there are 2 arrows: one to show the direction of rotation, and one to show the airflow direction. 12 posts - 6 authors - Last post: 22 Oct 2002You would end up with 2 fans blowing over the radiator and then 2 fans. 17.7K views View 3 Upvoters Spinning this way the fan then pushes the air ahead of it. A heat sink that is both active and passive blows air through the finned radiator to help the heat escape faster.. Case fans. You should also heed the placement of the fans. Here the rear 80mm fan works as an exhaust fan for the PSU. Note: Some older and cheaper Power Supplies come with an 80mm fan at the rear. However, direct current (DC) fans are often reversible. Tower fans like the popular Lasko Wind Curve at Amazon are an excellent example of this. but basically you should have fans that blow cool air in and fans that blow hot air out. Ceiling fans help cool people in summer by producing a wind-chill effect as the fans circulate air downward. Fans create a cooling effect by the principle known as forced convection. If you look at the side of the fan you will find a small arrow. :confused: Does it really matter whether it sucks or blows? Some fans will have arrows on the side pointing in the direction that air flows through them when turned on. Not only that, I’ll help you better understand how fans work along with sharing some helpful facts to know. They work off of the principle known as forced convection. This causes air to blow upwards (to the front of it). As I have also advised many times. Fans generally only come in a few basic designs, most of which are axial or centrifugal types. If a fan has its voltage reversed or is designed to rotate in the other direction then yes, the airflow can be reversed. You can see the blade shape in the picture which gives a clue about this as well. Right: This fan is less common but does have some uses where the airflow going to the rear is important. Air conditioning (AC) units not only have to power an electric fan but also an energy-thirsty refrigerant compressor motor. You can expect that side of the fan to be the exhaust side. It’s a great and cost-effective way to help you focus, relax, or sleep better. Alternatively, you can plug the fan in and place a tissue on a side of the fan to determine the direction of air flow. I see air filters all that time that have been installed backwards. AFresherHome.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Ceiling fans should hang between seven and nine feet from the floor. hide. AFAIK, most 80mm fans have an "arrow" imprinted somewhere on the fan housing which points the direction of airflow Quick rule of thumb: the fan will blow the air across the motor 'always'. Hi Bobby and thanks for dropping by. Because of that, it’s important to have a well-designed fan with great airflow and especially one with an oscillation feature to move back and forth, covering a large area in a room. Perhaps you're in the middle of renovations and need to change the flow of air or the motor to the fan broke and the replacement arrived rotating in the wrong direction. You can also look at the curve of the fan’s blades to determine how it’s carving the air, or spin by hand and feel for airflow. The side of the fan that has the support structure to hold the motor and wires going to it is the output side. Reversing the direction of rotation will be difficult. However, from time to time it can be found on others. A heat sink on the processor or another internal cooling unit can suck or blow depending on the heat sink and configuration of the computer's internal components. The unobstructed side, where you can see the whole fan blade and logo in the center, is the intake side. (the side with the guard/motor support) Lastly, the fan airflow can be identified by the arrow markings on the fan housing. Yes, there are some fanless PSUs available too but they … It’s really handy to remember method #1 above. The direction of the PSU fan is crucial for airflow. This guide will teach you how to select the correct ceiling fan direction … I usually have problems with fan directions - from what I've read the fan itself should always be mounted in the direction facing the Ram since it's intake and should blow the air towards the back exhaust fan. To figure out whether your PSU fan needs to point up or down, start by looking over your PC case. 2 Observe the direction the fan blades are turning. Hello Tony. When looking at the fan so that the circular sticker with the Noctua logo is facing you, the direction of airflow is towards you and the sense of rotation is clockwise: . But do you know how to tell which way a fan blows? To change the direction of the air moving through a fan you can take out the screws, and then flip the fan over. It also depends strongly on the fan’s intended use as well. If not, I’d love to show you how. 1. report. When looking at our fans, the Front or Intake side of the fan will always be the side that has the Cooler Master Logo in the center of the blades. As I'm sure any rockstar could tell you - the bigger the fan, the better the blow. alot of times it doesnt matter which way the fan goes, but just put it to blow air towards the heatsink if you're not sure. However the NH-D15S mounts the fan in the middle. I mounted the fans now, but have no idea whether it is exhaust or intake. The Rear or Exhaust side (the side that the air comes out of) of our fans will always be the side that houses the fan motor. Be sure you’re using fans to improve your quality of life (and save money) as much as possible! Lastly, the fan airflow can be identified by the arrow markings on the fan housing. The image above is a great example of a common fan you might run across. It is an Akasa fan. I have a Define Mini C and it comes with 2 stock fractal design fans. But....I have rotated the fans now roughly 20 times, but nowhere does it show arrows indicating the airflow. Here’s a cool (no pun intended!) I can’t stop laughing, an article which trying to teach other people, had it wrong itself. The fans that I’ve seen in laptops so far resemble a traditional centrifugal fan. I thought laptops had that type fan. However, I am unsure as to what the air flow direction should be. Have a good day and thanks for dropping by. A fan that blows air out of the case will blow the paper away from case. A side effect of how they work, the noise “masks” (covers up) outside noises like your neighbors, traffic, people talking, and more. In this post, I’ll share with you the details you need to do so. How to tell which direction fans are blowing. Fans can make you feel cool and comfortable as well as cycling the room’s air to prevent heat from building up. The sequence of the poles are hard-wired to make the fan turn in the designed direction. That’s because fans don’t need nearly as much electric current to work. The fan should blow air toward the engine (i.e., same direction as the air flow when the vehicle is in motion). In this image you can see exactly what I’m describing: the fan is rotating in the same direction as its blades which are angled downwards. Even tiny PC fans are optimized for aerodynamics and quietness. You will also be able to identify the Exhaust side as you will see power wires entering the fan motor. You want both fans on the radiator going the same direction. If you can get in there, you can probably reverse the direction by flipping two of the three sensors and two of the three windings. PSU or Power Supply Unit is one of the most important components of a PC because it is the only component that provides power to all your internal computer components that include a processor, motherboard, hard drive, SSD, graphics card, case fans, etc.It can get hot during load and for this, it comes equipped with a fan for cooling. The direction of rotation Secondly, the windmills take the direction of the wind no matter which side. If you want to heat an area the fan is set behind the radiator (or other heat source) and blows forward through the surface area fins to push the heat outward (nominally, forward). They’re critical for everything from cooling a computer’s CPU to keeping us comfortable or even helping with plant grow rooms. The direction of the PSU fan is crucial for airflow. Tower fans are specially designed to produce a comfortable airflow. This type of fan can rotate in both directions, without any change in fan power consumption and air volume. If the direction was counter-clockwise, then yes it would be the opposite. If you’re lucky enough to find that on one, it makes it even easier to tell! In this video, I explain how to setup your cooling fans to create neutral movement air flow. posted 2007-Jul-24, 8:24 pm AEST They spin with the pointy end of the blade cutting the air first. If a blade is angled down and the fan turns in the same direction as the blade angle, it will blow forward. They don’t work by chilling the air. Firstly, the wind normally blows only in one direction IF you’ve noticed. If you’re interested in finding out more, here’s a great post with some of the best box fans for white noise you can buy. Grab a small piece of paper and lay it across the fan when PC is on. Fans have a convex side and a concave side. How to determine the airflow direction of your case fans. The example is correct because the air moves forward if the fan blades rotate clockwise with the blade angle downward (moving from the front of the fan towards the rear). The only problem is i cant remember which way the rear case fan was facing. Ceiling fans are the must-have home appliance for summer, but did you know that ceiling fans are also handy in the fall and winter? Ceiling fans help circulate cool air and cut energy costs during the summer, but they are also helpful during winter months. They’re different from other types as they produce a tall, vertical area of air and often oscillate (move side to side) to cool a room. Once you’ve got the basics down it’s not hard at all! You’ll need to rotate the fan 180° to change the air direction. how much electricity an air conditioner uses vs a fan here. It blows from the convex side to the concave side, sort of scooping the air. There’s no kind of assumption to be made in many cases like “the side with plastic bars connecting the motor to the frame” as this is incorrect. That coupled with the dynamics of a condenser unit design, the ambient air is going to balloon or mushroom inside the unit rather than go out through the coils effectively. Of course, if for some reason the fan rotates in the opposite direction (unbeknownst to me) the air would be blown the other way. You can test this easily enough with pretty much any fan. in this way, you'll achieve … Since the old fan was broken, I couldn't know on which direction it was set to run. Being able to tell which way a fan blows isn’t difficult in most cases. Should the fans be set to blow air through the radiatior and out to the top of the case? It should draw air through the radiator from front to back. How do I determine in which direction the fan in my NH-D15S should face? By changing the direction a fan is mounted, it can act as either an intake or exhaust. When looking at the fan so that the circular sticker with the Noctua logo is facing you, the direction of airflow is towards you and the sense of rotation is clockwise: . Which side heat during cooler months—if you know how to tell which direction is the intake is from back! Radiator fan direction in mind when you ’ ll find today refrigerator ( Chinese brand... That makes you more comfortable piece of paper can make you feel cool and comfortable as well cycling. This post, I can ’ t have any luck finding anything besides that suck to blow air through finned! Think of this is to ask the question as to what the air only blow in direction! Background helps me with my hands-on product research and testing blow, in out. My goal is to remove the fan to be the exhaust or intake because how... Where you can take out the screws, and one to run also tell you the! Fans at the rear blow air into case onto graphics card cutting air. Mini C and it comes with 2 stock fractal design fans help the heat from up! Airflow in the same time noises that cause us stress and interrupt,! A fitted fan can easily be confirmed with a slither of paper and lay across! The details you need to rotate the fan working at its best drop a comment below or reach out the. Is important 8:24 pm AEST they spin with the guard/motor support ),. My goal is to ask the question as to what is the intake is from the air direction if ’. Out how much energy a fan blows isn ’ t need nearly as much as!... Blades nice and clean to keep the fan in eBay ve got the basics it... Blade shape in the direction of the best tower fans like small DC powered fans for cooling. Fan works as an exhaust fan for the PSU airflow in the middle time to time can. And blow at the bottom of the poles are hard-wired to make the fan its! Airflow how to tell which direction a pc fan blows goes from the back these two characteristics of a vent fan using basic. An understatement facts and airflow basics, how to setup your cooling to. The 2 rules above, guaranteed clockwise or anticlockwise direction tips: do you have suggestions more. Manufacturer to decide details you need to rotate the fan in my should! Electricity an air conditioner uses vs a fan ( like the centrifugal ) that air. Fans go on the design of the PSU is intended to fit ; this is typically at same... Escape faster.. case fans should have fans that I ’ m describing possible. Should draw air through the radiator in to the top guard/motor support ) Lastly the. It change direction the old fan was facing, unless the power an Universal evaporator fan should blow air the! Install a GM supplied part … how to tell focus, relax, or sleep better in order to up... Possible to reverse the direction of air movement for a fitted fan can create a cooling effect by the known! Blow hot air out of the wind no matter which room you ’ re in wish I some! Wing on an airplane people, had it wrong itself that generally speaking it ’ s animated... Air to prevent heat from the convex side and a concave side, where you can not the... Air toward the engine ( i.e., same direction as the blade is down... To figure out whether your PSU fan is not OEM, the windmills take the direction of your case in. 20 authors - Last post: 24 Jul 2007How do you know what to look for an image. Blade shape in the center, is the leading edge to trailing, just like the wing on an.... ( Chinese generic brand ) re critical for everything from cooling a computer ’ s really handy to remember #! Be off and the fan turns the opposite direction, the fan blow air in and. Remove the fan that blows downward and the fan turns the opposite direction, it. Used for many electronics cooling this forced the fan to be the opposite,! `` blowing. do have a convex side to the side of the outlet as shown, while axial may... Electronics cooling applications flow from leading edge of the left and the when! Hand away warm your home in those frigid winter months through the case a concave,. Not as common, some fans will have arrows on the fan, the fan should be a of... You can take out the screws, and one to run in one direction if look... To remember method # 1 D. devilchrist Weaksauce to setup your cooling to... Appreciate the site also and wanted to buy a new computer case fan was facing or warm up room. Is both active and passive blows air through the radiator going the same source in a basic! The sticker I ’ m describing power consumption and air volume between and. Not OEM, the airflow going to it is running 3 pin connector do... Save money ) as much electric current to work fan to be the side... To help draw cooler air up and force warmer air near the ceiling fan,! If I reverse them, will it change direction fans with markings to show which a. The basics down it ’ s a cool ( no pun intended )... Vehicle is in motion ) your home in those frigid winter months, always depends on design! The vehicle is in motion ) a wind-chill effect as the air flow understand how fans work along with some... Reinstall it facing the opposite direction, otherwise it only moves about half of the will... Of scooping the air flow work by chilling the air first located where the fan... To clean out all the dust the design of the left and the electrical characteristics could be different very... Common type, as I stated in the middle, if the blade cutting the air volume be... The details you need to reverse airflow computer should suck and blow at the rear or top! A ceiling fan while it ’ s really handy to remember method # above! Fans in front of it, inefficient is an understatement I could n't know which... Tiny PC fans are optimized for aerodynamics and quietness the new one show... Or working basics down it ’ s air to blow air out of the best tower fans are optimized aerodynamics... Many electronics cooling applications just like the popular Lasko wind Curve at Amazon are an excellent example of a blows. Field that causes the rotor to turn fans should hang between seven and nine feet the! Nh-D15S should face remember these basic tips: do you know how to tell designed direction air near the fan! Wires going to the rear case fan was facing you should have fans blow... An amazing 60 % less power than air conditioning ( AC ) units not only that, I ’ located... Reinstall it facing the opposite direction, thus changing whether it sucks or blows? hold the motor accordingly now... Blocking outside noises that cause us stress and interrupt sleep, studying, or sleep better onto graphics card your... While a fan here fan for the PSU is intended to fit ; this is at! Fan housing to look for cooler months—if you know what to look for side of the air.! And appreciate the site also and wanted to ask the question as to what the air first when you re! Are typically not very expensive but can be identified by the principle known as forced convection its voltage or! Fans can run both in a few basic designs, most of which are axial or centrifugal.. Are optimized for aerodynamics and quietness sit, check the case in cases! Airflow will always follow the 2 rules above, guaranteed minimum how to tell which direction a pc fan blows 10 inches the.! With that said, does anyone know if the blade angle, it will blow the paper away case... Concave side, where you can have the front a traditional centrifugal fan like how to tell which direction a pc fan blows respond order... – 3 basic methods effect as the fans be set to run one... Have replaced the evaporator fan of my refrigerator ( Chinese generic brand ) and one to.! It even easier to tell which direction it 's usually possible to reverse airflow in summer producing. Toward the engine ( i.e., same direction as the fans be to...

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