• We've upgraded our forums. Please post any issues/requests in this thread.

A REAL, air-tight duct from side of case to CPU fan?

Joined
Mar 25, 2009
Messages
1,116 (0.35/day)
Likes
73
Location
Somewhere in the underground
System Name Built Entirely With Parts From CompUSA
Processor E7400 2.8 @ 3.6 [9.0*400/1.31v]
Motherboard Gigabyte EP45-UD3R
Cooling Masscool 8WA741
Memory 2x1GB Corsair XMS2 800 4-4-4-12
Video Card(s) BFG 9800GTX+OC; GTS250 BIOS
Storage 2x WD 250GB AAKS in RAID0!
Display(s) 19" I-Inc LCD @ 1440x900
Case Ultra X-Blaster Clear Side
Audio Device(s) Audigy with X-Fi drivers; Logitech X-540s
Power Supply Corsair TX750
Software Vista 32-Bit
#1
I wanna know about this. I bet this would be insanely hugely beneficial, but has anyone done it? Yeah yeah, the cases have ducts and grilles, but what about a truly vacuum proof intake or output of air directly to the side of the case? What about making air-tight ducts for other things like video cards?

I think I'm on to something here guise.
 

Binge

Overclocking Surrealism
Joined
Sep 15, 2008
Messages
6,979 (2.07/day)
Likes
1,734
Location
PA, USA
System Name Molly
Processor i5 3570K
Motherboard Z77 ASRock
Cooling CooliT Eco
Memory 2x4GB Mushkin Redline Ridgebacks
Video Card(s) Gigabyte GTX 680
Case Coolermaster CM690 II Advanced
Power Supply Corsair HX-1000
#2
Sure, you could do it, but you mean air tight to the top of the CPU cooler right? Kind of impossible for a "vacuum seal."
 
Joined
Mar 25, 2009
Messages
1,116 (0.35/day)
Likes
73
Location
Somewhere in the underground
System Name Built Entirely With Parts From CompUSA
Processor E7400 2.8 @ 3.6 [9.0*400/1.31v]
Motherboard Gigabyte EP45-UD3R
Cooling Masscool 8WA741
Memory 2x1GB Corsair XMS2 800 4-4-4-12
Video Card(s) BFG 9800GTX+OC; GTS250 BIOS
Storage 2x WD 250GB AAKS in RAID0!
Display(s) 19" I-Inc LCD @ 1440x900
Case Ultra X-Blaster Clear Side
Audio Device(s) Audigy with X-Fi drivers; Logitech X-540s
Power Supply Corsair TX750
Software Vista 32-Bit
#3
Sure, you could do it, but you mean air tight to the top of the CPU cooler right? Kind of impossible for a "vacuum seal."
why not? you could put just a little bit of pressure on a rubber o-ring around the edges of the fan and mesh it up with the air duct.
 
Joined
Sep 20, 2006
Messages
460 (0.11/day)
Likes
22
#4
I've done it a couple way's with good results in regards to CPU temp only: A side panel fan with a duct mounted between the panel fan and CPU heatsink "no fan mounted on the CPU heatsink" and a front mount fan with a velocity stack made out of a plastic flower pot. Velocity stack was taped to the the front of the chassis fan inlet and sealed to the front bezel with hot glue, then a cardboard duct sealed onto the back of the case fan, leading to a PAL HS "also no fan mounted to the heatsink". In both configs the duct was sealed off from the rest of the system, except that it vented from the heatsink, into the case. Sort of neglected the rest of the system in regards to airflow.
 
Joined
Nov 1, 2008
Messages
3,619 (1.09/day)
Likes
935
Location
Vietnam
System Name Gaming System / Laptop / HTPC
Processor i5 8600K @4.6Ghz / i5 540m / i7 970
Motherboard Z370 Aorus Ultra Gaming / Acer / Shuttle sx58j3
Cooling CM Seidon 120 XL / Laptop Cooling / SE-903
Memory T Group Nighthawk (3000 MHz)/ 4GB DDR3 / 12gb DDR3
Video Card(s) Colorful 1080Ti / G210m / 7870XT
Storage 750G MX300 + 3TB HDDs / 250G Ultra II /250G 850 EVO
Display(s) Dell U2515H + Asus VX239H/ 15.6" Laptop Screen / 720p 42" Plasma TV
Case Cooler master HAF 922 / Laptop Case / Corsair Air 240
Audio Device(s) On Board Realtek
Power Supply Andyson N700 Titanium / Laptop Power / ACBell 700 W
Mouse Logitech G700s
Keyboard CM Quickfire XT (Cherry MX Reds)
Software Windows 10 x64
Benchmark Scores 3DMark Firestrike = xxxxx Timespy = 9097 Heaven = xxxx
#5
^^sounds ghetto.

No reason it shouldn;t work, but good airflow in your case is probably easier and would yield the same results, if not better as the airflow would also cool the other components on the video card.
 
Joined
Nov 9, 2008
Messages
2,191 (0.66/day)
Likes
1,068
Location
Texas
System Name Behemoth-6700k
Processor i7 6700k @ 4.7Ghz 1.37v
Motherboard Asus Sabertooth Z170 Mark 1
Cooling D5 Vario w/ EK X-Top; EK 240 PE, EK 420 PE; EK RES X3 150; HeatKiller IV Pro
Memory 32Gb (4x8Gb) GSkill Ripjaws 3000Mhz @ 15/16/16/35 1.35v
Video Card(s) Zotac 1080ti Amp Extreme
Storage Crucial M500 240GB; Mushkin 1TB SSD x 2; WD Blue 2TB; WD Black 1TB x2
Display(s) Acer XR341CK 34" 3440x1440; LG 27" 1920x1080
Case Phanteks Enthoo Primo; Phanteks F140SP Fans x 12 (6 x Top Rad); Noctua IPPC-2000 x4 (Bottom Rad)
Power Supply Enermax Platimax 1350
Mouse MS Trackball Optical
Keyboard Corsair K70 RGB; Razer Tartarus Chroma
Software Windows 10 Pro
#6
^^sounds ghetto.

No reason it shouldn;t work, but good airflow in your case is probably easier and would yield the same results, if not better as the airflow would also cool the other components on the video card.

+1 for good airflow. If the case moves air well, and efficiently, no need for a duct.
 

Kursah

Moderator
Staff member
Joined
Oct 15, 2006
Messages
10,941 (2.68/day)
Likes
5,048
Location
Missoula, MT, USA
System Name Kursah's Gaming Rig - Haswell Edition | Spartan Home Server 2015
Processor i7 4790k 4.0/4.8 @ 1.26v | i7 4790k 4.0/4.4 @ 1.18v - Both delidded w/CLU
Motherboard Asus Z87-Pro - BIOS 2103 | Asus Z87-Pro - BIOS 2103
Cooling Noctua NH-U14S Push-Pull | Cooler Master 212 EVO Stock - Using NT-H1 and AC MX-4
Memory 16GB (2x8) Corsair Dominator DDR3 2400 CL11 | 32GB (4x8) G.Skill DDR3-1600 CL9
Video Card(s) MSI GTX980 Ti Gaming 6G LE @ Stock | Onboard Intel HD 4600
Storage 850EVO 250GB SSD, 960GB SSD, 1x2TB | 840 120GB SSD, RAID10 6x2TB (6TB) + 8TB Backup
Display(s) Samsung 32" TV IPS 1080p, Dell 23" U2312HM IPS 1080p | 19" 4:3 Dell LCD..mostly RDP.
Case Corsair 600C - Stock Fans on Low | Lian Li Lancool PC-K7 - Cougar fans
Audio Device(s) Aune T1 mk1 > AKG K553 Pro + HiFiMAN HE-350 (Equalizer APO + PeaceUI) | Realtek ALC1150
Power Supply EVGA 750G2 Modular + APC 1500VA UPS | EVGA KR500 80+ Bronze + CyberPowerPC 1000VA UPS
Mouse Logitech G502 | Dell USB Laser Mouse
Keyboard Logitech G15 rv2 | Dell USB Keyboard
Software Windows 10 Pro x64 | Windows Server 2012 R2 (GUI Core,Hyper-V + VMs)
#7
Air ducts are used in pre-builds like Dells where low airflow is a concnern and extracting heat from the heaviest heat output source is required (i.e. cpu cooler), if you have decent case airflow and decent airflow @ the cpu cooler itself there would be no need for a duct and gains from it would be minimal or not even noticable. I made a duct out of cardboard and tape once when i had my e6300 @ 3.5ghz/1.35v and AC F7P, I actually got higher temps with the duct...which went from the intake fan to the exhaust fan. So it really depends on the overall rig, the amount of fans and airflow, and the quality if the cooling imo.
 
Joined
Sep 20, 2006
Messages
460 (0.11/day)
Likes
22
#8
^^sounds ghetto.

No reason it shouldn;t work, but good airflow in your case is probably easier and would yield the same results, if not better as the airflow would also cool the other components on the video card.
It was definately ghetto, but the paint job kinda hid the ghetto-ness! That was back when top of the line processors were Thunderbirds n most video cards had passive heatsinks, so yeah, bad idea to neglect the overall case airflow... One of the systems wasn't neglected in regards to case airflow, I added a bigger front intake fan, a bigger heatsink to the chipset and a blowhole with fan on the top case panel. A side panel intake fan was ducted to the CPU heatsink to supply the heatsink with fresh air; Gave pretty good temp results on a 1.2Ghz athlon at 1.3-1.4GHz with relatively tight memory timings. Without the additional fan the CPU was unstable when overclocked. With the fan, it ran solid.

My current ghetto PC is using the outlet of my radiator fan to cool the board/chipset/ram, with only the PSU fan for exhaust.. I still need to put in some other intake for cooling drives/ passive ramsinks/board/chipset, and possibly another exhaust fan or passive blow hole.

Overall case airflow is imporatant and shouldn't be overlooked. Keeping the stock case intake/exhaust, or adding to it, to increase case flow, use good wire management, then add another fan to duct fresh inlet air to the CPU heatsink, This SHOULD give you lower CPU temp results compared to just increasing the exhisting case airflow...

Completely sealed ducting, like with tape, or glue will make it more difficult to change components. Try to make the duct so that it has a foam gasket between the fan/duct, or CPU heatsink, so the duct can be easily removed when you need to get in there to change something.
 
Joined
Jul 17, 2005
Messages
461 (0.10/day)
Likes
45
Location
Peterborough, UK
Processor Intel Pentium Dual Core E2160
Motherboard ASUS P5E3 Deluxe
Cooling Akasa EVO 120
Memory 2 x 1Gb OCZ Gold DDR3 1066Mhz 6,6,6,18
Video Card(s) GeCube ATi X1950Pro 512Mb PCIe (Accelro X2)
Storage Samsung 320Gb SATA2
Display(s) Samsung SM206BW 20" Widescreen TFT 1680x1050
Case Coolermaster Centurion 532
Audio Device(s) On board AC'97
Power Supply Hiper Type-R 580W
Software Windows Vista Home Premium
Benchmark Scores See my OC Blog @ http://www.rowan-house.net/
#9
I think a duct from the outside (drawing air in from outside the building) to your intake fan would be beneficial especially in cold countries and during winter. You would probably also need to reverse the airflow so that the rear of the case was the intake.

But the internal ducting has limited success in my experience - better to 'let it flow'.
 
Joined
Mar 25, 2009
Messages
1,116 (0.35/day)
Likes
73
Location
Somewhere in the underground
System Name Built Entirely With Parts From CompUSA
Processor E7400 2.8 @ 3.6 [9.0*400/1.31v]
Motherboard Gigabyte EP45-UD3R
Cooling Masscool 8WA741
Memory 2x1GB Corsair XMS2 800 4-4-4-12
Video Card(s) BFG 9800GTX+OC; GTS250 BIOS
Storage 2x WD 250GB AAKS in RAID0!
Display(s) 19" I-Inc LCD @ 1440x900
Case Ultra X-Blaster Clear Side
Audio Device(s) Audigy with X-Fi drivers; Logitech X-540s
Power Supply Corsair TX750
Software Vista 32-Bit
#10
Well, I pulled down the duct that came with my case from where it was (about 3+ inches from the CPU fan) to just over the CPU fan, about a half inch from it, and I think it has made a difference of a couple of degrees. When I put my hand over the hole for the duct temps immediately jump 1-2 degrees. I don't understand why you guys don't/didn't/wouldn't think that drawing the coldest air (straight from the room) would help with CPU temps. IMO it's sort of like a cold air intake.
 

crtecha

New Member
Joined
Dec 8, 2008
Messages
2,407 (0.73/day)
Likes
204
Location
ipsay meechigan
System Name Coolin Runnings
Processor AMD X4 Phenom 9950 B.E. @ 3.3ghz
Motherboard Gigabyte GA-MA790x-DS4 BIOS Ver. F6
Cooling CM Vortex 752
Memory apacer PC6400 800mhz x 2
Video Card(s) Two ATI Radeon 4850's in xfire
Storage Seagate 7200.9 320gig+250gigx2
Display(s) Acer P191w 19' wide
Case Antec 900
Audio Device(s) onboard
Power Supply Antec Power trio 550watts
Software Windows 7 x64 Build 7100
#11
Pics brotha. I dig your idea. I think I may try something similar myself. Im more soo leaning towards the gfx card option though.
 
Joined
Nov 1, 2008
Messages
3,619 (1.09/day)
Likes
935
Location
Vietnam
System Name Gaming System / Laptop / HTPC
Processor i5 8600K @4.6Ghz / i5 540m / i7 970
Motherboard Z370 Aorus Ultra Gaming / Acer / Shuttle sx58j3
Cooling CM Seidon 120 XL / Laptop Cooling / SE-903
Memory T Group Nighthawk (3000 MHz)/ 4GB DDR3 / 12gb DDR3
Video Card(s) Colorful 1080Ti / G210m / 7870XT
Storage 750G MX300 + 3TB HDDs / 250G Ultra II /250G 850 EVO
Display(s) Dell U2515H + Asus VX239H/ 15.6" Laptop Screen / 720p 42" Plasma TV
Case Cooler master HAF 922 / Laptop Case / Corsair Air 240
Audio Device(s) On Board Realtek
Power Supply Andyson N700 Titanium / Laptop Power / ACBell 700 W
Mouse Logitech G700s
Keyboard CM Quickfire XT (Cherry MX Reds)
Software Windows 10 x64
Benchmark Scores 3DMark Firestrike = xxxxx Timespy = 9097 Heaven = xxxx
#12
Glad it worked - nowadays most heatsinks are to big to be able to use the side intake vent. Not many people using the standard style hsf anymore.

I don't understand why you guys don't/didn't/wouldn't think that drawing the coldest air (straight from the room) would help with CPU temps. IMO it's sort of like a cold air intake.
Because with good airflow the air inside your case will be the same temp as the air outside, with the added benifit of being able to cool more components.
 
Joined
Jul 17, 2005
Messages
461 (0.10/day)
Likes
45
Location
Peterborough, UK
Processor Intel Pentium Dual Core E2160
Motherboard ASUS P5E3 Deluxe
Cooling Akasa EVO 120
Memory 2 x 1Gb OCZ Gold DDR3 1066Mhz 6,6,6,18
Video Card(s) GeCube ATi X1950Pro 512Mb PCIe (Accelro X2)
Storage Samsung 320Gb SATA2
Display(s) Samsung SM206BW 20" Widescreen TFT 1680x1050
Case Coolermaster Centurion 532
Audio Device(s) On board AC'97
Power Supply Hiper Type-R 580W
Software Windows Vista Home Premium
Benchmark Scores See my OC Blog @ http://www.rowan-house.net/
#13
Well, I pulled down the duct that came with my case from where it was (about 3+ inches from the CPU fan) to just over the CPU fan, about a half inch from it, and I think it has made a difference of a couple of degrees. When I put my hand over the hole for the duct temps immediately jump 1-2 degrees. I don't understand why you guys don't/didn't/wouldn't think that drawing the coldest air (straight from the room) would help with CPU temps. IMO it's sort of like a cold air intake.
If you run a tight duct to your CPU and then cover the intake you starve the cpu of almost all it's air, hence the rise in temps, I'd expect more than a few degrees. This is not the equivalent of having no duct. If you use a duct you really need to be using a fan that draws in from the vent and blows down on the cpu, problem then is where does the hot air go? Usually it spreads in all directions and is not funnelled out of the case.

On the other hand if you encourage a linear flow from front to back and use a cpu cooler that also pushes air in that same motion then all air is quickly vented from the rear of the case. With a case that has good intake at the front there really shouldn't be any reason for the air to be any hotter when reaching the cpu than if drawn in through the side, unless you have a huge number of HDDs. The only additional cooling I'd add to my case atm is an additional fan on the rear of the 5.25" drive bays to speed up the air intake to cpu.
 
Joined
May 3, 2009
Messages
3 (0.00/day)
Likes
1
Location
Montgomery, Tx.
System Name The Black Hole
Processor P4@3.0MHz
Motherboard ECS 945P-A
Cooling Air, via 5 fans on a Sunbeam controller
Memory maxed@4gig (Kingston SuperX)
Video Card(s) EVGA nVidia 8400GS
Storage (2) Barracuda 250s
Display(s) LG Flatron 19"
Case CS-51
Audio Device(s) none
Power Supply Logisys 480w
Software Linux ONLY
Benchmark Scores Haven't a clue
#14
I'm fixin' to find out

I just started a project that should shed some light on the subject.
I was given a 4+ year old Dell Dimension about a year ago. Since then, the (only) fan in the machine has become obnoxiously loud and I decided to do something about it.
If y'all aren't already familiar with a common trick Dell uses in it's computers, it is that the only fan in the machines are ducted with the intention of pulling air in from the front of the case, past the vertically arranged hard drive(s), and then through the fins of the CPU heat sink. Finally, through this proprietary duct arrangement, the hot air is ducted out the back of the machine. The fact is, it must work, because they've done it for a long time, successfully. (Granted, the anemic qualities of these machines probably make this technique more able to handle the heat generated than a machine of any power).
At any rate, the factory installed fan had to go and I didn't care to find and install an identical fan into the machine, so I opted to install a 120mm into the roof of the machine. I have completely eliminated the original fan and duct, so I may find that there is a problem with airflow across he passive CPU heat sink and temps try to skyrocket.
My intention is to run the machine without the duct system for a while and see what happens. Meanwhile, I am in the process of designing and fabricating (or finding and adapting something from a commercial source) a duct system that will blow air onto the CPU, instead of draw air from it as the original duct did.
At this point, the project is in it's infancy- kindly forgive the lack of "finish" evident in the enclosed photos. That will (hopefully) come at a later time. Also, let me mention that I had to do a bit of structural surgery on the machine to facilitate placing the 120mm fan in the roof, forward of the PSU. It required that the optical drive be moved down one bay and the chassis had to be cut back.
 

Attachments

Studabaker

New Member
Joined
Mar 25, 2009
Messages
1,116 (0.35/day)
Likes
73
Location
Somewhere in the underground
System Name Built Entirely With Parts From CompUSA
Processor E7400 2.8 @ 3.6 [9.0*400/1.31v]
Motherboard Gigabyte EP45-UD3R
Cooling Masscool 8WA741
Memory 2x1GB Corsair XMS2 800 4-4-4-12
Video Card(s) BFG 9800GTX+OC; GTS250 BIOS
Storage 2x WD 250GB AAKS in RAID0!
Display(s) 19" I-Inc LCD @ 1440x900
Case Ultra X-Blaster Clear Side
Audio Device(s) Audigy with X-Fi drivers; Logitech X-540s
Power Supply Corsair TX750
Software Vista 32-Bit
#15
I just started a project that should shed some light on the subject.
I was given a 4+ year old Dell Dimension about a year ago. Since then, the (only) fan in the machine has become obnoxiously loud and I decided to do something about it.
If y'all aren't already familiar with a common trick Dell uses in it's computers, it is that the only fan in the machines are ducted with the intention of pulling air in from the front of the case, past the vertically arranged hard drive(s), and then through the fins of the CPU heat sink. Finally, through this proprietary duct arrangement, the hot air is ducted out the back of the machine. The fact is, it must work, because they've done it for a long time, successfully. (Granted, the anemic qualities of these machines probably make this technique more able to handle the heat generated than a machine of any power).
At any rate, the factory installed fan had to go and I didn't care to find and install an identical fan into the machine, so I opted to install a 120mm into the roof of the machine. I have completely eliminated the original fan and duct, so I may find that there is a problem with airflow across he passive CPU heat sink and temps try to skyrocket.
My intention is to run the machine without the duct system for a while and see what happens. Meanwhile, I am in the process of designing and fabricating (or finding and adapting something from a commercial source) a duct system that will blow air onto the CPU, instead of draw air from it as the original duct did.
At this point, the project is in it's infancy- kindly forgive the lack of "finish" evident in the enclosed photos. That will (hopefully) come at a later time. Also, let me mention that I had to do a bit of structural surgery on the machine to facilitate placing the 120mm fan in the roof, forward of the PSU. It required that the optical drive be moved down one bay and the chassis had to be cut back.
Nice. Good post and welcome to TPU. Definitely keep us posted! :toast:
 
Joined
May 3, 2009
Messages
3 (0.00/day)
Likes
1
Location
Montgomery, Tx.
System Name The Black Hole
Processor P4@3.0MHz
Motherboard ECS 945P-A
Cooling Air, via 5 fans on a Sunbeam controller
Memory maxed@4gig (Kingston SuperX)
Video Card(s) EVGA nVidia 8400GS
Storage (2) Barracuda 250s
Display(s) LG Flatron 19"
Case CS-51
Audio Device(s) none
Power Supply Logisys 480w
Software Linux ONLY
Benchmark Scores Haven't a clue
#16
Thank you

Your acknowledgment is appreciated and I look forward to learning and sharing what I've learned.
 
Joined
May 3, 2009
Messages
3 (0.00/day)
Likes
1
Location
Montgomery, Tx.
System Name The Black Hole
Processor P4@3.0MHz
Motherboard ECS 945P-A
Cooling Air, via 5 fans on a Sunbeam controller
Memory maxed@4gig (Kingston SuperX)
Video Card(s) EVGA nVidia 8400GS
Storage (2) Barracuda 250s
Display(s) LG Flatron 19"
Case CS-51
Audio Device(s) none
Power Supply Logisys 480w
Software Linux ONLY
Benchmark Scores Haven't a clue
#17
Wow, has it really been this long since I posted here? I intended to return and update before now.

My efforts to create a duct system failed- the little Dimension 3000 case simply doesn't afford enough space to accomplish what I envisioned.

In addition to the roof-mounted fan, I ended up going with a CPU cooler and fan and a newly installed 120mm fan in the front of the case. I considered ducting the CPU fan to the side panel but, from past experience, knew it would raise the noise level and decided against it. My new theory is that filling the case with fresh air from the front, forcing it across the CPU and exhausting it out the top would provide sufficient cooling. I found a couple Panaflo 92mm fans at Frozen CPU for 99¢ each, so I bought them in the event I needed additional air flow from the back. I've not needed them.
 

Attachments