I'm leaning towards exhaust. A balance must be struck between intake and exhaust. I see what you guys all mean and I appreciate your reply's. 1. share. report. Feb 22, 2005 9 0 0. Never seen them on the aftermarket, but I'm sure they are out there, just uncommon. You brought … "Minor variations" are when you do things like increase the fan speed on exhaust or intake, then there is more air going in than out, or more air going out than in. If you'd like to contribute Someone doesnt know much.... Apart from minor variations airflow in always equals airflow out. This can have the opposite effect than what you want to achieve. This type of system is known as an Active Exhaust, Passive Intake System. install in opposite direction will make it exhaust if it was intake. For your system, there is no reason not to set the fans on the H115i to exhaust out. Ideally, the intake fan should be the same size as the exhaust fan, but it can be a little smaller if necessary. 848 0 obj <> endobj 846 0 obj <> endobj 847 0 obj <>stream 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. The fan I am using is quite small, but the objective is still the same. This can cause the intake of dust through any hole in your case. I would think that the number of intake fans should be more than the number of exhaust fans… Since you stated in another thread that you also want to use a fan-control, you are perfectly fine. If you're not sure or you don't want to spend the money, start out with just an exhaust fan. 2015-08-25T12:07:46Z application/pdf It won’t be efficient enough for you to notice the difference though. Editorials, Articles, Reviews, and more. There is no such thing as specialized intake or exhaust fans. Most front intake fans, even with dust filters on their intakes, should be Air Flow types also. 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. 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. 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. This can cause the intake of dust through any hole in your case. More reason to make the decision based on your case, hardware, and environment. 67% Upvoted. They are classic applications for Air Flow fan designs. 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). Just for fun, I wanted to show how easy it is to turn a PC fan into an intake, or into an exhaust fan. 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 … 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. 14 comments. It also depends strongly on the fan… How to tell which way a fan blows – 3 basic methods. I-P_A19_Ch46.fm 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. content. LinuxQuestions.org is looking for people interested in writing Acrobat Distiller 10.0.0 (Windows) This is what I intend to achieve. sorry for acting stupid. You brought up a good point when you mentioned air pressure. However, I've mounted my secondary case fans as exhaust ones in order to vent any hot air within the case. I've seen them in OEM systems, Dell used to use 92mm exhaust fans that would mount only one way. Now having said this, there is the issue of AREA of intake in relation to AREA of exhaust. What you notice: An intake fan will blow air directly at you. 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. Junior Member. Has it ever occured to you that if you turn a fan around, it will blow the other way? (IRC 2006, Section M1602.2). - Chart does not take into account any other type of cooling accessories like shade and/or misting or other evaporative cooling equipment. Intakes must be protected against rain and pest entry with durable rust- and rodent-proof materials. I don't want to blow dust and fluff into my system which could cause overheating problems and defeat the object of extra cooling. 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. 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. save. 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. Just let the intake fans run a little bit faster than the exhaust fans and you should achieve what you want. 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. Some fans dont have mounting option on the other side. uuid:25da04fa-708c-42da-9283-06ceac8532e5 Since I have a liquid cooler they only put in one 120mm top fan because that is all that would fit. - Chart assumes the exhaust fan and intake(s) are installed in opposite end walls (as shown below without any other openings near the fan). seriously. hide. From an untrained eye, it is difficult to distinguish between an intake and an exhaust valve. There is. its the way you install a fan. 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. 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. Rear fans usually are exhaust, and most commonly do no have any dust filters before or after them. 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. Exhaust fans go on the rear or the top. 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. FrameMaker 2015.2 Top can be either, depending on the case setup. 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. 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. I see what you guys all mean and I appreciate your reply's. didn't saw the extra questions. 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