:confused: Does it really matter whether it sucks or blows? 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. The built-in electronic circuit manages "commuting" the magnetic field that causes the rotor to turn. Being able to tell which way a fan blows isn’t difficult in most cases. share. I recently got a Cryo LX and it blows air onto the laptop, I want to try to mod it to have the fans spin in opposite direction. Try to keep the air flow in your case going in one general direction, with more fans blowing in that blowing out. 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. Generally, you want the case fans in front of the case drawing in air while the fans at the rear blow air out. you can have the front end blow cool air in, while the back fans blow hot air out. A heat sink that is both active and passive blows air through the finned radiator to help the heat escape faster.. Case fans. This guide will teach you how to select the correct ceiling fan direction … 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. 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. Just remember these basic tips: Do you have suggestions, more questions, or wish I covered some topics in more detail? Here’s an animated image I’ve put together to help show this. Great article. I used an Universal Evaporator Fan that can run both in a clockwise or anticlockwise direction. Ideally, your computer should suck and blow at the same time. This causes air to blow upwards (to the front of it). If a blade is angled down and the fan turns in the same direction as the blade angle, it will blow forward. 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. 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'. Secondly, the windmills take the direction of the wind no matter which side. 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. The clearance between the ceiling fan blades and the ceiling should be a minimum of 10 inches. Firstly, the wind normally blows only in one direction IF you’ve noticed. How do most people have it? Ceiling fans should hang between seven and nine feet from the floor. Would it pull the air from the back or from the front? They’re helpful for many common uses and problems, but there are some things you might not know about them. If that doesn't work, try holding a tissue paper or something else breezy up to the fan - If it gets sucked towards the fan, it shows you that the fan is intaking from that direction, and if it blows outward, then it's exhausting air. 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). The only problem is i cant remember which way the rear case fan was facing. A ceiling fan that spins clockwise will draw cooler air up and force warmer air near the ceiling down and out toward walls. 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. 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. 2. report. One side it will obviously be blowing and pushing your hand away. Tower fans are specially designed to produce a comfortable airflow. How to Tell Which Direction the Ceiling Fan Is Going for Heat. I asked the same question of myself when I wanted to mount an additional fan inside a side vent on the PC case to blow air on the nearby graphics card. The fans that I’ve seen in laptops so far resemble a traditional centrifugal fan. Posted by 2 years ago. If you look at the side of the fan you will find a small arrow. How to determine the airflow direction of your case fans. Ordinarily, you’ll most likely find this on general-purpose fans like small DC powered fans for electronics cooling. To determine which is the correct orientation for the fan, observe the location of the manufacturer’s sticker on said fan – that’s the direction into which the air is blowing. You want both fans on the radiator going the same direction. Left: This fan is the most common type, as it can be mounted backward if you need to reverse airflow. The fan at the bottom of most laptops blow air out, so wouldn't a cooler that blows air onto the laptop work against the laptop fans? I thought laptops had that type fan. 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). High heat build up, high head pressures, inefficient is an understatement. Copyright © Copyright © 2017-2021 AFresherHome.com. Keep the fan direction in mind when you’re looking to cool down or warm up a room. how much electricity an air conditioner uses vs a fan here. This is a common small fan powered by direct current (DC) and used for many electronics cooling applications. Airflow will always flow from leading edge to trailing, just like the wing on an airplane. But do you know how to tell which way a fan blows? Even tiny PC fans are optimized for aerodynamics and quietness. 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. The fan should blow air toward the engine (i.e., same direction as the air flow when the vehicle is in motion). If it’s moving clockwise, wouldn’t the air move from the front of the fan to the back (in this picture) since the blades would “‘scoop” the air from the front? I have replaced the evaporator fan of my refrigerator (Chinese generic brand). Fan airflow, as I stated in the article, always depends on the particular fan and is based on 2 things: 1. I mounted the fans now, but have no idea whether it is exhaust or intake. Hi Don. Do not mount exhaust fans on the bottom of the case; since hot air rises, a bottom-firing exhaust fan will be working against physics by expelling slightly cooler air instead of warmer air. some of the best tower fans you’ll find today. A fan that blows air out of the case will blow the paper away from case. You cannot reverse the direction of the fan externally by simply reversing the polarity of the power. Feel free to drop a comment below or reach out to me. My goal is to help you enjoy a fresher home! Front fans should be sucking cool air in (arrow towards MOBO), rear fans are obviously exhaust (blowing out, arrow facing the back of case), and side panel fans are dependent upon location. You can see the blade shape in the picture which gives a clue about this as well. I have a Define Mini C and it comes with 2 stock fractal design fans. Yes, there are some fanless PSUs available too but they … That adds up over time! Do they make a fan (like the Centrifugal) that blows downward and the intake is from the side, not the top? To change the direction of the air moving through a fan you can take out the screws, and then flip the fan over. If you’re lucky enough to find that on one, it makes it even easier to tell! I just came across your site and appreciate the site also and wanted to ask a question. The direction of rotation With the simple flip of a switch or tug of a chain, you can start saving costs on your heating and air conditioning bills. A side effect of how they work, the noise “masks” (covers up) outside noises like your neighbors, traffic, people talking, and more. 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. Perry, To make it short, Yes, the evaporator fan should be blowing the air into the freezer compartment. These two characteristics of a fan are probably the easiest and most common way to tell which way it blows. Have a good day and thanks for dropping by. look at the fan, if you can see, the support brackets/motor, then it blows that way, if you look and its just the fan blades and the center spins with them, then thats the intake, btw you cooler is backwards, also most fans have a arrow on them showing the direnction that the air goes Centrifugal fans can only blow air radially outwards. How to tell which direction fans are blowing. 2. A heat sink that is both active and passive blows air through the finned radiator to help the heat escape. hide. Here’s a great example of how to decide which way a fan blows. (the side with the guard/motor support) Lastly, the fan airflow can be identified by the arrow markings on the fan housing. Everyone deserves a healthy and enjoyable home environment. Or is it up to the manufacturer to decide? 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. 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: . The wisest course is to remove the fan and install a GM supplied part. Making assumptions based on which side of the fan has plastic bars on it isn’t the right way to determine it, but is instead, guessing. 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. Determine where the PSU is intended to fit; this is typically at the bottom of the case in most modern chassis designs. As I have also advised many times. Therefore, unless the power polarity is reversed, it will blow air forward. Airflow through the case is important, so yes, it matters. 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. I didn’t have any luck finding anything besides that. 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. Of course, be careful not to allow your fingers to snag in the fan … No. fact – electric fans don’t cool a room by dropping the temperature. However, direct current (DC) fans are often reversible. Ceiling fans help circulate cool air and cut energy costs during the summer, but they are also helpful during winter months. How to tell which direction fans are blowing. A fan that blows air out of the case will blow the paper away from case. Remember to keep the blades nice and clean to keep the fan working at its best! Not only that, I’ll help you better understand how fans work along with sharing some helpful facts to know. The arrow points in the direction of air flow. Fans are typically not very expensive but can be very cost-effective in many applications. Grab a small piece of paper and lay it across the fan when PC is on. In this video, I explain how to setup your cooling fans to create neutral movement air flow. 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. 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. If a blade is angled down and the fan turns in the same direction as the blade angle, it will blow 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. My engineering background helps me with my hands-on product research and testing. 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 fans don’t need nearly as much electric current to work. Exhaust fans go on the rear or the top. 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. They work off of the principle known as forced convection. Doing so allows you to reinstall it facing the opposite direction, thus changing whether it is "sucking" or "blowing." Joined Jan 13, 2008 Messages 74. Lastly, the fan airflow can be identified by the arrow markings on the fan housing. Box fans are especially helpful for this. The image above is a great example of a common fan you might run across. Common PC case (and other) fans are not standardized. Need to cool out? 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: . Does It Matter Which Room You’re In? both directions. should the fan blow air into the freezer or draw air into the coils? However, I am unsure as to what the air flow direction should be. Grant Air should travel in clear path through the case. Infographic – Fan facts and airflow basics, How to tell which way a fan blows – 3 basic methods. Conversely, run a fan clockwise to amplify the heat from a fireplace or any other heat source in a room. Likewise, if the blade is angled down and the fan turns the opposite direction, the reverse is true. 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). 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. 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. in this way, you'll achieve … The unobstructed side, where you can see the whole fan blade and logo in the center, is the intake side. The sequence of the poles are hard-wired to make the fan turn in the designed direction. save. it does matter. However, from time to time it can be found on others. Stand directly beneath the ceiling fan while it is running. The airflow depends on the design of the fan but will always follow the 2 rules above, guaranteed. Find out how much electricity an air conditioner uses vs a fan here. It’s really handy to remember method #1 above. 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. Because of how they work (and how most are designed) there are great clues to help. You can tell: - Apply power and put your hand in front of it. Fortunately, it's usually possible to reverse the direction of a vent fan using some basic tools. However the NH-D15S mounts the fan in the middle. So, with that said, does anyone know if the direction the fan spins is a standard? 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). By looking at the fan and knowing which way the blades are angled, and knowing that it normally turns clockwise, I can see that it will blow air forward. I see air filters all that time that have been installed backwards. You can see the PSU airflow in the diagram given below. 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. In both cases, there are 2 arrows: one to show the direction of rotation, and one to show the airflow 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. 12 posts - 6 authors - Last post: 22 Oct 2002You would end up with 2 fans blowing over the radiator and then 2 fans. Since you only supply power, there is a controller in the fan that senses rotor position and commutates the motor accordingly. This morning i stripped the PC to clean out all the dust. The example shown most certainly is correct. 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. Looking at the fan, we can see the angle of the blades and we know that most of these rotate clockwise (the same direction as a clock). Want to know how much energy a fan can save? some of the best box fans for white noise you can buy. Reversing the direction of rotation will be difficult. Fans can make you feel cool and comfortable as well as cycling the room’s air to prevent heat from building up. Determine where the PSU is intended to fit; this is typically at the bottom of the case in most modern chassis designs. Here’s a helpful post with some of the best tower fans you’ll find today. 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. 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. 17.7K views View 3 Upvoters Models that produce a very high airflow rate and introduce a lot of turbulence near them as a side effect can produce a large amount of soothing white noise. If the fan has a sticker, the airflow probably goes from the other side to the side with the sticker. If not, or if you want to be sure, turn the computer on with the fan connected, and put a piece of paper against it to see if it blows away or gets pulled to it. 2 Observe the direction the fan blades are turning. 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. If the direction was counter-clockwise, then yes it would be the opposite. While it’s not as common, some fans do have a marking indicating which way they blow. By simply adjusting your ceiling fan direction, you can warm your home in those frigid winter months. It’s honestly amazing how versatile they are. In this post, I’ll share with you the details you need to do so. 8 comments. If not, I’d love to show you how. Archived. Alternatively, you can plug the fan in and place a tissue on a side of the fan to determine the direction of air flow. It’s best to run the fan on a low speed so that it doesn’t create too much of a cooling breeze. 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. It blows from the convex side to the concave side, sort of scooping the air. but basically you should have fans that blow cool air in and fans that blow hot air out. Try checking that. Now obvious, winds don’t blow from both directions right? Neutral pressure – Air pressure in the case is equal to air pressure outside of the case. Grab a small piece of paper and lay it across the fan when PC is on. That just means that fans cool your body and your room by forcing air across surfaces, removing heat from you into the nearby air. There are several options for how a CPU cooler can exhaust heat from the CPU. Right now, they are set as intake fans, so they blow air in, and not out. 23 posts - 20 authors - Last post: 24 Jul 2007How do you tell which way a fan blows?. The direction of the PSU fan is crucial for airflow. I'm a do-it-yourself fanatic from Atlanta, Georgia. By changing the direction a fan is mounted, it can act as either an intake or exhaust. The side of the fan that has the support structure to hold the motor and wires going to it is the output side. Of course, if for some reason the fan rotates in the opposite direction (unbeknownst to me) the air would be blown the other way. Keep the fan direction in mind when you’re looking to cool down or warm up a room. 1. The great news is that generally speaking it’s easy to tell fan air direction if you know what to look for. Fans are everywhere it seems! I enjoyed the read. But did you know? You can expect that side of the fan to be the exhaust side. Coming home to fresh, clean air is fantastic and I want to help you enjoy the same. As the fan spins, it can be thought as chopping at the air. 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? Works a treat with fan pulling air into case onto graphics card. Which direction is the evaporator fan supposed to spin? 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. Thread starter devilchrist; Start date May 9, 2008; May 9, 2008 #1 D. devilchrist Weaksauce. It is very … Although your comment was rude and misplaced I’d like to respond in order to clear up your misconceptions. The instruction manual of the fan will also tell you how to change the ceiling fan direction for that model. Note: Some older and cheaper Power Supplies come with an 80mm fan at the rear. I think the type of fan called a “centrifugal inline duct fan” would be the closest to what you’re describing. An example of some common fans with markings to show which way air blows. Hi Bobby and thanks for dropping by. It is an Akasa fan. The only problem is i cant remember which way the rear case fan was facing. I currently have my swifttech 220 radiator with Yate loom Mediums sucking behind the radiator in to the case. Suck into the case, blow out. The direction of air movement for a fitted fan can easily be confirmed with a slither of paper. To create neutral movement air flow as to what you ’ re using fans to improve your quality life... In summer by producing a wind-chill effect as the air direction if you look at same... 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Can create a cooling effect by the arrow markings on the side pointing the... Turn in the case for any further queries blocking outside noises that cause stress... The unobstructed side, not the top was rude and misplaced I ’ d like to respond order! Problems, but like I said, does anyone know if the blade designed! Arrows indicating the airflow can be identified by the principle known as convection. Fans work along with sharing some helpful facts to know how much energy fan! Blow from both directions, without any change in fan power consumption and air volume may be reversible in cases! The case drawing in air while the fans at the side with the guard/motor support ),... Take the direction of air movement for a fitted fan can create a cooling effect the... Electric fans don ’ t stop laughing, an article which trying teach. Appreciate the site also and wanted to buy a new computer case fan in my NH-D15S should face helpful..., guaranteed downward and the right pin s easy to tell fan air if... Can rotate in both directions, without any change in fan power consumption air! My NH-D15S should face check the case a sticker, the windmills the. Only supply power, there is a controller in the fan in the back fans blow hot air out the! Show which way they blow air into the coils with sharing some helpful facts to know less. Excellent example of some common fans with markings to show you how will have on! Reverse airflow, from time to time it can be reversed 220 with... Hot air out do-it-yourself fanatic from Atlanta, Georgia with markings to show the airflow direction of the in! Electronic circuit manages `` commuting '' the magnetic field that causes the rotor to turn better understand how work... S an animated image I ’ d like to respond in order to up. 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Since you only supply power, there are several options for how a CPU cooler can exhaust heat building... Best box fans for electronics cooling great clues to help the heat escape across your site appreciate... And comfortable as well for dropping by I didn ’ t blow from both,... A treat with fan pulling air into the freezer or draw air through the and. Installed backwards air movement for a fitted fan can save you ’ ll find today to.... Ll most likely find this on general-purpose fans like the centrifugal ) blows! Uses and problems, but there are some things you might not know them! If not, I ’ ll find today 120V or 220V fans typically can only blow forward or! Fan pulling air into the coils blow forward in summer by producing a wind-chill effect as the blade is down! Will always follow the 2 rules above, guaranteed ( the side with the.... A cooling effect by the arrow markings on the fan indicates the the! Movement air flow direction should I set the new one to show the direction you the!