• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

How many exhaust and intake fans should I put in my casing ?

Jacinto

New Member
Joined
Jun 22, 2020
Messages
14 (0.01/day)
I bought a Armageddon kagami k1 case which can hold up to 4, fans so my question is how many exhaust and intake fans should I put to keep it in a cool condition also I need to know whether I can put asus thx 760 in my casing
My specs :
Motherboard - asus h81m-c
Cpu - i34160
Ram - 4x2 ddr3
Gpu - asus gtx 760
Psu - 500 watt super flower
I need to know how many exhaust and intake led fans that I need to put
IMG-20200618-WA0031.jpg

IMG-20200622-WA0005.jpg
IMG-20200610-WA0030.jpg
 
Joined
May 5, 2020
Messages
58 (0.04/day)
Closed front case, oh boy.

I'd recommend one rear exhaust, one top exhaust above the CPU cooler and at least one intake on the front. You'd want more exhausts than intakes on a case like that.

You won't get great airflow in that case.
 
Last edited by a moderator:
Joined
Aug 6, 2017
Messages
7,412 (3.05/day)
Location
Poland
System Name Purple rain
Processor 10.5 thousand 4.2G 1.1v
Motherboard Zee 490 Aorus Elite
Cooling Noctua D15S
Memory 16GB 4133 CL16-16-16-31 Viper Steel
Video Card(s) RTX 2070 Super Gaming X Trio
Storage SU900 128,8200Pro 1TB,850 Pro 512+256+256,860 Evo 500,XPG950 480, Skyhawk 2TB
Display(s) Acer XB241YU+Dell S2716DG
Case P600S Silent w. Alpenfohn wing boost 3 ARGBT+ fans
Audio Device(s) K612 Pro w. FiiO E10k DAC,W830BT wireless
Power Supply Superflower Leadex Gold 850W
Mouse G903 lightspeed+powerplay,G403 wireless + Steelseries DeX + Roccat rest
Keyboard HyperX Alloy SilverSpeed (w.HyperX wrist rest),Razer Deathstalker
Software Windows 10
Benchmark Scores A LOT
one fan - get one more fan
two fans - one front intake,one rear exhaust
three fans - two front intakes,one rear exhaust
four fans-two front intakes,one rear exhaust,one top exhaust
five fans - three front intakes,one rear exhaust,one top exhaust.

top exhaust can spin much slower than rear exhaust.no need for it to run at high rpm cause not only the rear exhaust will do most of the hot air exhaust job anyway,the top fan is the most audible due to its position.
 
Joined
Oct 22, 2014
Messages
13,210 (3.83/day)
Location
Sunshine Coast
System Name Black Box
Processor Intel Xeon E3-1260L v5
Motherboard MSI E3 KRAIT Gaming v5
Cooling Tt tower + 120mm Tt fan
Memory G.Skill 16GB 3600 C18
Video Card(s) Asus GTX 970 Mini
Storage Kingston A2000 512Gb NVME
Display(s) AOC 24" Freesync 1m.s. 75Hz
Case Corsair 450D High Air Flow.
Audio Device(s) No need.
Power Supply FSP Aurum 650W
Mouse Yes
Keyboard Of course
Software W10 Pro 64 bit
You'd want more exhausts than intakes on a case like that.

You won't get great airflow in that case.
No, just no.
More intake than exhaust to create positive pressure, unless you want it to be a vacuum cleaner.
 
Last edited by a moderator:
Low quality post by FreedomEclipse

FreedomEclipse

~Technological Technocrat~
Joined
Apr 20, 2007
Messages
23,306 (3.77/day)
Location
London,UK
System Name Codename: Icarus Mk.VI
Processor Intel 8600k@Stock -- pending tuning
Motherboard Asus ROG Strixx Z370-F
Cooling CPU: BeQuiet! Dark Rock Pro 4 {1xCorsair ML120 Pro|5xML140 Pro}
Memory 32GB XPG Gammix D10 {2x16GB}
Video Card(s) ASUS Dual Radeon™ RX 6700 XT OC Edition
Storage Samsung 970 Evo 512GB SSD (Boot)|WD SN770 (Gaming)|2x 3TB Toshiba DT01ACA300|2x 2TB Crucial BX500
Display(s) LG GP850-B
Case Corsair 760T (White)
Audio Device(s) Yamaha RX-V573|Speakers: JBL Control One|Auna 300-CN|Wharfedale Diamond SW150
Power Supply Corsair AX760
Mouse Logitech G900
Keyboard Duckyshine Dead LED(s) III
Software Windows 10 Pro
Benchmark Scores (ノಠ益ಠ)ノ彡┻━┻
thats a really bad case.


Sell it and get a Fractal Define Core Series case or a CORSAIR Carbide Series case. Whatever you pick you want to pay at least TWICE the value of that Armaggeddon case. Its a really really cheap POS

::Edit::

Just to make a point. If I really couldn't afford a good case, I'd be making one out of a Shoebox or cardboard box. Reinforcing some places with glue and Extra cardboard and attaching fans where they can get recent airflow
 
Last edited:
Joined
Aug 6, 2017
Messages
7,412 (3.05/day)
Location
Poland
System Name Purple rain
Processor 10.5 thousand 4.2G 1.1v
Motherboard Zee 490 Aorus Elite
Cooling Noctua D15S
Memory 16GB 4133 CL16-16-16-31 Viper Steel
Video Card(s) RTX 2070 Super Gaming X Trio
Storage SU900 128,8200Pro 1TB,850 Pro 512+256+256,860 Evo 500,XPG950 480, Skyhawk 2TB
Display(s) Acer XB241YU+Dell S2716DG
Case P600S Silent w. Alpenfohn wing boost 3 ARGBT+ fans
Audio Device(s) K612 Pro w. FiiO E10k DAC,W830BT wireless
Power Supply Superflower Leadex Gold 850W
Mouse G903 lightspeed+powerplay,G403 wireless + Steelseries DeX + Roccat rest
Keyboard HyperX Alloy SilverSpeed (w.HyperX wrist rest),Razer Deathstalker
Software Windows 10
Benchmark Scores A LOT
thats a really bad case.


Sell it and get a Fractal Define Core Series case or a CORSAIR Carbide Series case. Whatever you pick you want to pay at least TWICE the value of that Armaggeddon case. Its a really really cheap POS
spc for value cases for sure
 
Joined
Jan 31, 2012
Messages
2,452 (0.55/day)
Location
Bulgaria
System Name Sandfiller
Processor I5-10400
Motherboard MSI MPG Z490 GAMING PLUS
Cooling Noctua NH-L9i (92x25mm fan)
Memory 32GB Corsair LPX 2400 Mhz DDR4 CL14
Video Card(s) MSI RX 5700 XT GAMING X
Storage Intel 670P 512GB
Display(s) 2560x1080 LG 29" + 22" LG
Case SS RV02
Audio Device(s) Creative Sound Blaster Z
Power Supply Fractal Design IntegraM 650W
Mouse Logitech Triathlon
Keyboard REDRAGON MITRA
Software Windows 11 Home x 64
Anything above 4 fans has diminishing returns. But in your particular case, there is only one front fan, which if you install a regular 3.5" HDD you can't have. So no front fans for you. Just populate the other three exhaust positions: rear, roof A and roof B and you are ready to bake the cake :D Actually, you can go creative here (no joke), since there is no front or bottom fan for cold air, might as well reverse the exhaust fans into intake fans, especially the rear one. I've seen it done before and it does some better job, than just full exhaust setup. Here is an example setup: rear- intake, roof B-intake, roof A- exhaust. There you go.
 

Jacinto

New Member
Joined
Jun 22, 2020
Messages
14 (0.01/day)
The thing Is you can put 2 fans at the top
1 fan at the back and 1 fan at the front
 
Joined
Dec 31, 2009
Messages
19,366 (3.72/day)
Benchmark Scores Faster than yours... I'd bet on it. :)
More intake than exhaust only prevents a bit of dust inside the case. Thats it.

I'd load up the front and top/rear and you will be fine. Don't worry about balancing rpms and whatnot for 'pressure'.
 
Joined
Jul 16, 2014
Messages
8,115 (2.29/day)
Location
SE Michigan
System Name Dumbass
Processor AMD Ryzen 7800X3D
Motherboard ASUS TUF gaming B650
Cooling Artic Liquid Freezer 2 - 420mm
Memory G.Skill Sniper 32gb DDR5 6000
Video Card(s) GreenTeam 4070 ti super 16gb
Storage Samsung EVO 500gb & 1Tb, 2tb HDD, 500gb WD Black
Display(s) 1x Nixeus NX_EDG27, 2x Dell S2440L (16:9)
Case Phanteks Enthoo Primo w/8 140mm SP Fans
Audio Device(s) onboard (realtek?) - SPKRS:Logitech Z623 200w 2.1
Power Supply Corsair HX1000i
Mouse Steeseries Esports Wireless
Keyboard Corsair K100
Software windows 10 H
Benchmark Scores https://i.imgur.com/aoz3vWY.jpg?2
To me, this is one of those "I just look pretty in RGB" cases and I only see limited potential for some mild ghetto modding. its obvious there is only 1 ( maybe 2) method(s) to get the best air flow and turning the top fans as intake is not one of them.
 
Joined
Jun 1, 2011
Messages
3,817 (0.81/day)
Location
in a van down by the river
Processor faster than yours
Motherboard better than yours
Cooling cooler than yours
Memory smarter than yours
Video Card(s) better performance than yours
Storage stronger than yours
Display(s) bigger than yous
Case fancier than yours
Audio Device(s) clearer than yours
Power Supply more powerful than yours
Mouse lighter than yours
Keyboard less clicky than yours
Benchmark Scores up yours
No, just no.
More intake than exhaust to create positive pressure, unless you want it to be a vacuum cleaner.
what kind of "pressure" can anyone create in a case that is full of holes? Some cases do better with more exhaust then intake (some NZXT come to mind) but its up to the individual to test that out based on their specific hardware set up. That said you would probably be looking at 2-3c differences.
 
Joined
Oct 22, 2014
Messages
13,210 (3.83/day)
Location
Sunshine Coast
System Name Black Box
Processor Intel Xeon E3-1260L v5
Motherboard MSI E3 KRAIT Gaming v5
Cooling Tt tower + 120mm Tt fan
Memory G.Skill 16GB 3600 C18
Video Card(s) Asus GTX 970 Mini
Storage Kingston A2000 512Gb NVME
Display(s) AOC 24" Freesync 1m.s. 75Hz
Case Corsair 450D High Air Flow.
Audio Device(s) No need.
Power Supply FSP Aurum 650W
Mouse Yes
Keyboard Of course
Software W10 Pro 64 bit
That case reminds me of the CoolerMaster case I had prior to getting a decent one with airflow.
Temps were roughly 20C higher in that CM case and the small front vents were great at sucking dust up.
 

freeagent

Moderator
Staff member
Joined
Sep 16, 2018
Messages
7,421 (3.67/day)
Location
Winnipeg, Canada
System Name Altered Beast
Processor AMD R9 5900X/5800X3D
Motherboard Asus Crosshair VIII Dark Hero
Cooling Thermalright Phantom Spirit 120 EVO, 1x T30
Memory 2x8 G.Skill Trident Z Royal 3200C14, 2x8GB G.Skill Trident Z Black and White 3200 C14
Video Card(s) Zotac 4070 Ti Trinity OC
Storage WD SN850X 2TB, SN850 1TB, SN770 1TB - Asus Hyper M.2, 2x SN770 1TB
Display(s) LG 50UP7100
Case Fractal Torrent Compact RGB
Audio Device(s) JBL 2.1 Deep Bass
Power Supply EVGA SuperNova 750w G+, Monster HDP1800
Mouse Logitech G502 Hero
Keyboard Logitech G213
VR HMD Oculus 3
Software Yes
Benchmark Scores Yes
what kind of "pressure" can anyone create in a case that is full of holes? Some cases do better with more exhaust then intake (some NZXT come to mind) but its up to the individual to test that out based on their specific hardware set up. That said you would probably be looking at 2-3c differences.
Not much if any, if you use regular dinky grade case fans. A quality case fan should get you a little, industrials have no problem with pressure. My Meshify can bleed like crazy if I let it. Love it.

Edit:

I guess it doesn’t bleed.. but everything gets pushed right out the back with authority.
 
Joined
Oct 21, 2005
Messages
6,874 (1.02/day)
Location
USA
System Name Computer of Theseus
Processor Intel i9-12900KS: 50x Pcore multi @ 1.18Vcore (target 1.275V -100mv offset)
Motherboard EVGA Z690 Classified
Cooling Noctua NH-D15S, 2xThermalRight TY-143, 4xNoctua NF-A12x25,3xNF-A12x15, 2xAquacomputer Splitty9Active
Memory G-Skill Trident Z5 (32GB) DDR5-6000 C36 F5-6000J3636F16GX2-TZ5RK
Video Card(s) EVGA Geforce 3060 XC Black Gaming 12GB
Storage 1x Samsung 970 Pro 512GB NVMe (OS), 2x Samsung 970 Evo Plus 2TB (data 1 and 2), ASUS BW-16D1HT
Display(s) Dell S3220DGF 32" 2560x1440 165Hz Primary, Dell P2017H 19.5" 1600x900 Secondary, Ergotron LX arms.
Case Lian Li O11 Air Mini
Audio Device(s) Audiotechnica ATR2100X-USB, El Gato Wave XLR Mic Preamp, ATH M50X Headphones, Behringer 302USB Mixer
Power Supply Super Flower Leadex Platinum SE 1000W 80+ Platinum White
Mouse Zowie EC3-C
Keyboard Vortex Multix 87 Winter TKL (Gateron G Pro Yellow)
Software Win 10 LTSC 21H2
Armaggeddon-Kagami-K1-Infineon-Loop-II-Full_17.jpg
Armaggeddon-Kagami-K1-Infineon-Loop-II-Full_18.jpg
Does it even have front intakes?
Maybe cut a hole in the floor for an intake fan in front of the power supply.
 
Last edited:

freeagent

Moderator
Staff member
Joined
Sep 16, 2018
Messages
7,421 (3.67/day)
Location
Winnipeg, Canada
System Name Altered Beast
Processor AMD R9 5900X/5800X3D
Motherboard Asus Crosshair VIII Dark Hero
Cooling Thermalright Phantom Spirit 120 EVO, 1x T30
Memory 2x8 G.Skill Trident Z Royal 3200C14, 2x8GB G.Skill Trident Z Black and White 3200 C14
Video Card(s) Zotac 4070 Ti Trinity OC
Storage WD SN850X 2TB, SN850 1TB, SN770 1TB - Asus Hyper M.2, 2x SN770 1TB
Display(s) LG 50UP7100
Case Fractal Torrent Compact RGB
Audio Device(s) JBL 2.1 Deep Bass
Power Supply EVGA SuperNova 750w G+, Monster HDP1800
Mouse Logitech G502 Hero
Keyboard Logitech G213
VR HMD Oculus 3
Software Yes
Benchmark Scores Yes
Wow.. I’m impressed. That case is like an easy bake oven.
 
Joined
Jun 1, 2011
Messages
3,817 (0.81/day)
Location
in a van down by the river
Processor faster than yours
Motherboard better than yours
Cooling cooler than yours
Memory smarter than yours
Video Card(s) better performance than yours
Storage stronger than yours
Display(s) bigger than yous
Case fancier than yours
Audio Device(s) clearer than yours
Power Supply more powerful than yours
Mouse lighter than yours
Keyboard less clicky than yours
Benchmark Scores up yours
Not much if any, if you use regular dinky grade case fans. A quality case fan should get you a little, industrials have no problem with pressure.

You are talking about air static pressure from a fan and I'm talking about the internal air pressure, two different things.

View attachment 159831
View attachment 159832
Does it even have front intakes?
Maybe cut a hole in the floor for an intake fan in front of the power supply.

It has a top and bottom vent similar to the phanteks P400, corsair spec delta, aerocool cyclone, and countless others. If it was my case and I was air cooling it I would certainly make sure that front roof vent is free of any fan so the CPU cooler can pull in outside air and I knock out all those push out pci slots and replace them with vented ones.
 
Joined
Mar 18, 2015
Messages
2,960 (0.90/day)
Location
Long Island
1. If you want a quiet system, add up your poweer consumption for all your heat generating components.... then divide that total ny:

50-75 watts for 120mm fans
75 - 100 watts for 140mm fane.

2. Air flow doesn't cae whether fans or intakes or exhaust. The only thing you have to think about when trying to cool down a room ois having two openings and 1 fan. Whether you make it an intake fan or an exhaust fan is meaningless. As long as the other window is open, you will get the exact same air flow.

3. Whether a fan is intake or exhaust depends on where the mounting is

Front = in
Bottom = in
Rear = out
Side = (low mount = in / high mount = out
Top = it depends

For top, radiator fans always blow in no exceptions ... top fans can blow out unless you break the rule below

Intake Fans - 1.3 - 1.5 times # of exhaust fans. Intake fans have filters so they can reduce air flow by 30% of more. If you have fans blowing out on top because you 8th grade science teacher told you hot air rises... did he also say it does when fan blowing the other way... of course not,. When you have more air blowing out then in, thea air will be sucked in thru the wide open rear fan grilles and vented slot covers. Now if you're thinking dust is the problem, ... yeas that is a consideration but the bigger issue is wjhat's carrying the dust in. Normally, that's got to be the hot exhaust from your GFX card and PSU. We test every build with a fog machine and in almost every case .... top fans blowing out result in the case filling up with gog when the exhaust from the fog machine is discharged at case rear. If you cant have more ins than outs, I like to leave the case top fan mounts empty ... this allows passive removal of heat when fans shut off. We set up all builds to shut fans off when GPU / CPU temps dont require active cooling.
 
Last edited:
Joined
Jun 27, 2019
Messages
1,817 (1.05/day)
Location
Hungary
System Name I don't name my systems.
Processor i3-12100F 'power limit removed'
Motherboard Asus Prime B660-PLUS D4
Cooling ID-Cooling SE 224 XT ARGB V3 'CPU', 4x Be Quiet! Light Wings + 2x Arctic P12 black case fans.
Memory 4x8GB G.SKILL Ripjaws V DDR4 3200MHz
Video Card(s) Asus TuF V2 RTX 3060 Ti @1920 MHz Core/950mV Undervolt
Storage 4 TB WD Red, 1 TB Silicon Power A55 Sata, 1 TB Kingston A2000 NVMe, 256 GB Adata Spectrix s40g NVMe
Display(s) 29" 2560x1080 75 Hz / LG 29WK600-W
Case Be Quiet! Pure Base 500 FX Black
Audio Device(s) Onboard + Hama uRage SoundZ 900+USB DAC
Power Supply Seasonic CORE GM 500W 80+ Gold
Mouse Canyon Puncher GM-20
Keyboard SPC Gear GK630K Tournament 'Kailh Brown'
Software Windows 10 Pro
No need to overcomplicate imo, that hardware setup wont overheat even with just 1+1 fans 'intake+exhaust'.

My previous system with the very same CPU and a GTX 950 Xtreme was in a 10+ years old plexi side panel hot box case and nothing overheated or was loud. '~15$ CPU cooler and only 2 fans in the case cause I disabled the side panel fan'

CPU was around 50-60 Celsius in games and the card maxed out at 66 or so during summer.
 
Joined
Nov 13, 2007
Messages
10,209 (1.71/day)
Location
Austin Texas
Processor 13700KF Undervolted @ 5.6/ 5.5, 4.8Ghz Ring 200W PL1
Motherboard MSI 690-I PRO
Cooling Thermalright Peerless Assassin 120 w/ Arctic P12 Fans
Memory 48 GB DDR5 7600 MHZ CL36
Video Card(s) RTX 4090 FE
Storage 2x 2TB WDC SN850, 1TB Samsung 960 prr
Display(s) Alienware 32" 4k 240hz OLED
Case SLIGER S620
Audio Device(s) Yes
Power Supply Corsair SF750
Mouse Xlite V2
Keyboard RoyalAxe
Software Windows 11
Benchmark Scores They're pretty good, nothing crazy.
With that hardware one exhaust fan will be enough.
 

MxPhenom 216

ASIC Engineer
Joined
Aug 31, 2010
Messages
12,944 (2.61/day)
Location
Loveland, CO
System Name Ryzen Reflection
Processor AMD Ryzen 9 5900x
Motherboard Gigabyte X570S Aorus Master
Cooling 2x EK PE360 | TechN AM4 AMD Block Black | EK Quantum Vector Trinity GPU Nickel + Plexi
Memory Teamgroup T-Force Xtreem 2x16GB B-Die 3600 @ 14-14-14-28-42-288-2T 1.45v
Video Card(s) Zotac AMP HoloBlack RTX 3080Ti 12G | 950mV 1950Mhz
Storage WD SN850 500GB (OS) | Samsung 980 Pro 1TB (Games_1) | Samsung 970 Evo 1TB (Games_2)
Display(s) Asus XG27AQM 240Hz G-Sync Fast-IPS | Gigabyte M27Q-P 165Hz 1440P IPS | Asus 24" IPS (portrait mode)
Case Lian Li PC-011D XL | Custom cables by Cablemodz
Audio Device(s) FiiO K7 | Sennheiser HD650 + Beyerdynamic FOX Mic
Power Supply Seasonic Prime Ultra Platinum 850
Mouse Razer Viper v2 Pro
Keyboard Razer Huntsman Tournament Edition
Software Windows 11 Pro 64-Bit
I always go for positive pressure to keep the interior mostly dust free. So that means more total intake CFM than exhaust CFM. (more intake fans vs exhaust). This can be creatively modulated by CFM rating of the fans youre using. One fan in the front with higher CFM rating than say the 2 exhaust fans you could have combined is still positive pressure so keep that in mind.

Next best is Neutral pressure.
 

Jacinto

New Member
Joined
Jun 22, 2020
Messages
14 (0.01/day)
No need to overcomplicate imo, that hardware setup wont overheat even with just 1+1 fans 'intake+exhaust'.

My previous system with the very same CPU and a GTX 950 Xtreme was in a 10+ years old plexi side panel hot box case and nothing overheated or was loud. '~15$ CPU cooler and only 2 fans in the case cause I disabled the side panel fan'

CPU was around 50-60 Celsius in games and the card maxed out at 66 or so during summer.
Do do you think that I canam play fortnite with my pc specs
 
Joined
Jul 16, 2014
Messages
8,115 (2.29/day)
Location
SE Michigan
System Name Dumbass
Processor AMD Ryzen 7800X3D
Motherboard ASUS TUF gaming B650
Cooling Artic Liquid Freezer 2 - 420mm
Memory G.Skill Sniper 32gb DDR5 6000
Video Card(s) GreenTeam 4070 ti super 16gb
Storage Samsung EVO 500gb & 1Tb, 2tb HDD, 500gb WD Black
Display(s) 1x Nixeus NX_EDG27, 2x Dell S2440L (16:9)
Case Phanteks Enthoo Primo w/8 140mm SP Fans
Audio Device(s) onboard (realtek?) - SPKRS:Logitech Z623 200w 2.1
Power Supply Corsair HX1000i
Mouse Steeseries Esports Wireless
Keyboard Corsair K100
Software windows 10 H
Benchmark Scores https://i.imgur.com/aoz3vWY.jpg?2
1. If you want a quiet system, add up your poweer consumption for all your heat generating components.... then divide that total ny:

50-75 watts for 120mm fans
75 - 100 watts for 140mm fane.

2. Air flow doesn't cae whether fans or intakes or exhaust. The only thing you have to think about when trying to cool down a room ois having two openings and 1 fan. Whether you make it an intake fan or an exhaust fan is meaningless. As long as the other window is open, you will get the exact same air flow.

3. Whether a fan is intake or exhaust depends on where the mounting is

Front = in
Bottom = in
Rear = out
Side = (low mount = in / high mount = out
Top = it depends

For top, radiator fans always blow in no exceptions ... top fans can blow out unless you break the rule below

Intake Fans - 1.3 - 1.5 times # of exhaust fans. Intake fans have filters so they can reduce air flow by 30% of more. If you have fans blowing out on top because you 8th grade science teacher told you hot air rises... did he also say it does when fan blowing the other way... of course not,. When you have more air blowing out then in, thea air will be sucked in thru the wide open rear fan grilles and vented slot covers. Now if you're thinking dust is the problem, ... yeas that is a consideration but the bigger issue is wjhat's carrying the dust in. Normally, that's got to be the hot exhaust from your GFX card and PSU. We test every build with a fog machine and in almost every case .... top fans blowing out result in the case filling up with gog when the exhaust from the fog machine is discharged at case rear. If you cant have more ins than outs, I like to leave the case top fan mounts empty ... this allows passive removal of heat when fans shut off. We set up all builds to shut fans off when GPU / CPU temps dont require active cooling.
A well designed case will have fans directing airflow.

A 1 or 2 fan case doesnt need top exhaust fans, because...( wait for it!)....heat rises! :p
 
Top