nless you go through a circus of manuvers and typing just to find out there is some extradinary thing one has left out! Yes, and the suggestion in the manual to use the fans as intake is contradicted by the picture right above it that shows the fans in an exhaust position and arrows pointing up and out. Silverstone is one of the few exceptions to this and they have repeatedly introduced cases which use an AP181 as a top intake. The most cited reason for this is because hot air rises so it makes sense to use it as an exhaust. (IRC 2006, Section M1602.2). I kept the top fans as intake and had the two front fans as intake as well, so there’s a lot of air being forced into the case. Junior Member. The first step is to find or buy a 12v DC plug adapter. 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. hide. If you're not sure or you don't want to spend the money, start out with just an exhaust fan. My current case has 3 intakes (1 case floor, 2 case front) and 3 exhausts (1 rear, 2 roof) setup in a positive pressure configuration (i.e. When I punch the hole and put the fan in, is it better to have it as exhaust or intake? 14 comments. It also depends strongly on the fan… Do your GPU fans intake air or exhaust air? (4 intake, 3 exhaust, can increase top and rear exhaust fan speed and keep side fanspeed lower, keeping audible noise lower) I prefer to keep the side panel on anyway, and the bottom being an intake to help push airflow up would create a better flow towards the exhaust. Just for fun, I wanted to show how easy it is to turn a PC fan into an intake, or into an exhaust fan. didn't saw the extra questions. EXHAUST STACK AND AIR INTAKE DESIGN STRATEGIES Stack Design Strategies The dilution a stack exhaust can pr ovide is limited by the disper-sion capability of the atmosphere. However, I've mounted my secondary case fans as exhaust ones in order to vent any hot air within the case. This can cause the intake of dust through any hole in your case. The Rear or Exhaust side (the side that the air comes out of) … Wall intakes must also be 10 feet from any exhaust fan discharge outlet unless that outlet is 3 feet or more above the intake location. Every laptop has one or more intake spots where it takes cool air inside the laptop and one exhaust spot where it pushes the hot air out of the laptop. However, Inlet valves are larger (for suction of more air) while exhaust valves are smaller. I purchased a 80mm LED fan to put in the side of my computer. GeForce 7900 GS fan constant whirring is too much - help for fan/gpu control required, ACPI or lm-sensors fan control on Sony Vaio (fan runs at full speed), /proc/acpi/fan is empty and the fan always work. Generally, match the fans with whatever’s pre-installed in the enclosure – front is normally intake, rear is normally exhaust. Download your favorite Linux distribution at, Distribution: Ubuntu 10.04 and CentOS 5.5, Distribution: Cinnamon Mint 19.2 (Netbook) and 18.3 (Desktop), Location: Summer Midwest USA, Central Illinois, Winter Central Florida, Distribution: Whatever fits the task best. I-P_A19_Ch46.fm Has it ever occured to you that if you turn a fan around, it will blow the other way? Whether exhausting air or bringing fresh air into a structure, the calculation produced should help to figure out the size of fan(s) required to accomplish the air exchanges needed. The fan I am using is quite small, but the objective is still the same. How to determine the airflow direction of your case fans? Efficiency: An intake fan will be operating at a slightly higher pressure and will be more efficient. It's true that having the intake fan pointing upward takes in "warm" air from the inside of the case, but the fan doesn't have to work hard to pull air in through the bottom of the case. intakes blow more than exhausts). Feb 22, 2005 9 0 0. I'm leaning towards exhaust. This type of system is known as an Active Exhaust, Passive Intake System. Now having said this, there is the issue of AREA of intake in relation to AREA of exhaust. This fan calculator is typically used to calculate the CFM or cubic feet per minute of air exchange that may be desired in a building. This will cause a complete reversal back to the original menu where one can start all over and get some new messages! While that may be true in natural convection once there is airflow in the case the effect of convection is minimal. Rear fans usually are exhaust, and most commonly do no have any dust filters before or after them. The great news is that generally speaking it’s easy to tell fan air direction if you know what to look for. report. Exhaust fans go on the rear or the top. LinuxQuestions.org is looking for people interested in writing Before discharging out the stack, exhaust contamination can be reduced by filters, collectors, and scrubbers to maintain acceptable ai r quality. If you have more exhaust- than intake-fans you will have a pressure in your case that is slightly below the pressure in the environment. They are classic applications for Air Flow fan designs. I read an article that said one wants the exhaust fans to let slightly less air out then the intake fans let in. Top fans = pull (exhaust). LOL, "exhaust fans to let slightly less air out then the intake fans let in". 2015-08-25T12:07:46Z Bottom fans = push (intake). https://www.maketecheasier.com/intake-exhaust-fans-airflow-desktop-pc 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. And they put in a 140mm side fan. seriously. There is no such thing as specialized intake or exhaust fans. - Chart does not take into account any other type of cooling accessories like shade and/or misting or other evaporative cooling equipment. ... CPU Heatsink Fan - Intake or Exhaust? closing thread. Editorials, Articles, Reviews, and more. Since you stated in another thread that you also want to use a fan-control, you are perfectly fine. This fan here is rated at 80cfm, which will work for a small box set-up. If it's not performing as well as you thought it would, try adding an intake fan - you'll smile when you see the difference! content. If you'd like to contribute For your system, there is no reason not to set the fans on the H115i to exhaust out. Putting a high flow fan as an intake that is at a point with low AREA at the vent just is overkill and may actually generate small amounts of heat from the fan itself. I see what you guys all mean and I appreciate your reply's. How to install a new desktop case fan and which direction it should face. 848 0 obj <> endobj 846 0 obj <> endobj 847 0 obj <>stream This can have the opposite effect than what you want to achieve. endstream endobj 836 0 obj <> endobj 820 0 obj <> endobj 819 0 obj <> endobj 604 0 obj <> endobj 821 0 obj [44 0 R 49 0 R 103 0 R 105 0 R 135 0 R 174 0 R 176 0 R 510 0 R 542 0 R] endobj 44 0 obj <. Since I have a liquid cooler they only put in one 120mm top fan because that is all that would fit. This can cause the intake of dust through any hole in your case. The top fan is an exhaust and bottom fan is an intake. I'm applying the fan to my XP-90 Heatsink and I just need to know if the fan should be blowing towards the CPU or away. Most front intake fans, even with dust filters on their intakes, should be Air Flow types also. There is. Intakes should not be located directly above any wall exhaust or vent. Step 4: Start With the Exhaust The first spot you will clean the fan from is the exhaust and you will do it by decompressing the canned air into the exhaust at more than 2 spots. How to tell which way a fan blows – 3 basic methods. Never seen them on the aftermarket, but I'm sure they are out there, just uncommon. You brought … And finally, let’s populate all 140mm of fan slots, with two at the front, two at the top, and one for exhaust. Because of how they work (and how most are designed) there are great clues to help. You brought up a good point when you mentioned air pressure. This is what I intend to achieve. Should I place the fan in the exhaust, intake or both? its the way you install a fan. I see what you guys all mean and I appreciate your reply's. I would think that the number of intake fans should be more than the number of exhaust fans… sorry for acting stupid. From an untrained eye, it is difficult to distinguish between an intake and an exhaust valve. In that case, you might benefit from a third small intake fan … Ideally, the intake fan should be the same size as the exhaust fan, but it can be a little smaller if necessary. The thing is that the cooler fan that is looking towards the front of the case it's set as intake, as it receives cooled air from the 2 intake fans. 1. The goal of stack design hkennedy 2019-04-16T08:24:25Z This is a defining characteristic of some exhaust fans that affects the way we may determine fan airflow as compared to a forced air system where fans are … 67% Upvoted. The Intake-exhaust direction should go front-to-back and bottom-to-top. Some fans dont have mounting option on the other side. Although in-line exhaust fans exist, most exhaust fans are found at either the start of a duct or at the end of a duct. share. If you have more exhaust- than intake-fans you will have a pressure in your case that is slightly below the pressure in the environment. uuid:25da04fa-708c-42da-9283-06ceac8532e5 This keeps a positive pressure inside the case and keeps dust and whatever from coming in through the cracks witch is what my systemm did before it went down. I never thought about this until I wanted to add 2 intake fans on the bottom of my case to potentially keep my GPU cooler but I realised I dont really know if the GPU fans are intakes or outtakes. It won’t be efficient enough for you to notice the difference though. dumb query. Someone doesnt know much.... Apart from minor variations airflow in always equals airflow out. Also, I don't think the air inside the case would ever be more than a few degrees above ambient. Top can be either, depending on the case setup. Just let the intake fans run a little bit faster than the exhaust fans and you should achieve what you want. I've seen them in OEM systems, Dell used to use 92mm exhaust fans that would mount only one way. uuid:644e6fbd-c9f3-4424-917a-f47ef0ff25ca install in opposite direction will make it exhaust if it was intake. The fan should be placed in the exhaust, and the intake should be a simple hole (or light trap, if light getting out is a concern). Intakes must be protected against rain and pest entry with durable rust- and rodent-proof materials. More reason to make the decision based on your case, hardware, and environment. I don't want to blow dust and fluff into my system which could cause overheating problems and defeat the object of extra cooling. What you notice: An intake fan will blow air directly at you. A balance must be struck between intake and exhaust. Acrobat Distiller 10.0.0 (Windows) - Chart assumes the exhaust fan and intake(s) are installed in opposite end walls (as shown below without any other openings near the fan). %PDF-1.4 %���� I also got a 120mm fan for the front of the case, which I know is intake. application/pdf You might have two large exhaust fans with a very high CFM and two smaller intake fans with a much lower CFM. If it was just the 4 case fans, then that would work if you want positive pressure. save. 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