Fan config

Grisweld · December 19, 2018

So to start this off I will give you list what case I have because it probably matters It is a Thermaltake Core V31 mid tower. Can be found here https://www.thermaltake.com/products-model.aspx?id=C_00002469. I have been looking into getting new fans for this case because it was a prebuild from cyberpower with some unknown brand in them, in the past week or so I removed the HD cage placed the 2 TB HD (mounted ofc) into the extra drive bay that you can convert to a fan speed control bay. Then proceeded to do a ton of cable management to swap from a zotac gtx 950 to a zotac gtx 1070ti amp extreme, also I swapped my boot to a Samsung 860 evo 2.5" 500GB ssd all I can say is leaps and bounds. Now that we have got all that out of the way onto the real reason this post is being made lol. SO i want to place 2 Corsair Air Series AF140's (https://www.corsair.com/eu/en/Categories/Products/Fans/AIR-SERIES-LED-CONFIG/p/CO-9050017-PLED) that have a airflow of 66.4 CFM each in the front for the intakes and 2 Corsair Air Series AF120's (https://www.corsair.com/eu/en/Categories/Products/Fans/AIR-SERIES-LED-CONFIG/p/CO-9050015-PLED) that have a airflow of 52.19 CFM each in the rear for exhaust. Would this technically be a positive pressure case at that point at least on paper or adequate enough to flow cool air in and out quickly to cool everything on hot summer days where room temps are between 70-75 °F or 21- 29 °C for the rest of the world.

Maybe even use the SP120 by corsair for the exhaust because they have a slightly better flow at 57.24 CFM (https://www.corsair.com/eu/en/LED-Color/Fan-Size/AIR-SERIES-LED-CONFIG/p/CO-9050033-WW)

LogicalDrm · December 19, 2018

How cool components are depends on their coolers and general airflow. As in, as long as there is airflow, it doesn't really matter how much airflow is. Not unless you put air turbine as intake.

Your "pressure" will be close to neutral as intakes are usually partially blocked by dust filters and front bays.

RAS_3885 · December 19, 2018

Don't overthink it too much.

Depending on case configuration (your's does not appear to be very restrictive internally) most people will be fine with 2 intake and one exhaust, so choose a decent fan you like and run with it. Also remember, the spec chart CFM will be the fan's maximum, but it's not likely you'll be running the fans at 100 percent speed all the time. My case fans run between 300-400 RPM most of the time (20 percent PWM) because in that range they're inaudible to me and still generate sufficient airflow. They only kick up to 800-900 RPM when the graphics card gets over 60 C (so whenever gaming).

Positive case pressure can be achieved by setting intake speed higher than exhaust, or having more intake fans if that's what you're going for. You should have no issues with your planned set-up as far as air flow is concerned.