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[Demciflex] $25 shipped oversized 200mm and 140mm filter , $17 200mm filter, $15 shipped dual 140mm filter,

post #1 of 11
Thread Starter 
http://www.demcifilter.com/c151/Fan-Filters-Monthly-Specials.aspx

$25 200mm and 140mm http://www.demcifilter.com/p9003/FREE-SHIPPING.aspx
*1 x 277mm x 228mm. Actual filter size: 249mm x 200mm.
*1 x 160mm x 175mm. Actual filter size: 136mm x 151mm

$17 square 200mm http://www.demcifilter.com/p9002/FREE-SHIPPING.aspx
*1 x 277mm x 228mm. Actual filter size: 249mm x 200mm

$15 Dual 140mm http://www.demcifilter.com/p9004/FREE-SHIPPING.aspx
* Overall size:300mm x 182mm. Actual filter size: 272mm x 154mm
20% airflow restriction according to them (Click to show)
Method

All fans have a CFM (cubic feet per minute) rating. This rating tells you how many cubic feet of air the fan is able to move in one minute. A fan's CFM ratings are achieved by various means like fan speed (RPM or revolutions per minute), the size, depth, shape and angle of the fan blades as well as the number of fan blades. Normal 80mm fans have between 6 and 8 blades that push less than 20CFM. To create positive or neutral pressure the total CFM sum of the intake fans must be higher or equal to the total CFM sum of air extracted from the case.

To Calculate what you need to setup positive pressure in your computer or electronic unit's case, please follow the information and instructions below.

Determining CFM ratings of fans

CFM ratings of fans are usually indicated on the packaging or the fan itself but in case of this information not being available, contact the manufacturer of the fan through their websites. If you are unsure contact your dealer.

Factors to take into account

• Filter rating - CFM inhibited by filter action (% of filtered intake). By its very nature all filters will affect the flow of air. DEMCiflex Filters has been optimize to have the least affect on airflow while still stopping dust into your unit..

• Internal fans - CFM in needed to cool components. These are fans inside the case of your computer and will include CPU fan(s), graphic card fans, HDD cooling fans etc.

• Intake fans - CFM in. These fans are situated on the case of the computer drawing air into the case.

• Exhaust fans - CFM out. These fans might be found on the case of the computer as well as power supply units and PCI slot fans. It expels air out of the computer case.

• Openings in case - CFM in either direction. All other unfanned openings leading into and out of the case


Filter rating: F

This rating will depend on the filter rating you are using. This is expressed as a percentage and is indicated on the packaging. Example: If the filter rating is 15 it will inhibit 15% of the air from entering the computer case. This sum will have to be added to the required CFM of air needed for the intake fan(s) to compensate for the loss of air. Let's call the filter rating value F. Remember that this is a percentage value. DEMCiflex Filters are rated at 20.

Determining the CFM sum of the internal fans: C

Add all the internal fans CFM ratings together. This is the minimum CFM of air that is needed to cool the internal components like CPUs, RAM and graphic cards. Call this value C


Determining the CFM sum of the intake fans: A

Add all the CFM ratings of the fans blowing air from outside the computer case into the case together. Call this value A

Determine the total air intake into the computer: T

Deduct the filter rating value (F) from the CFM sum of the intake fan(s). Call this value T

Determining exhaust fans CFM rating: E

Add the CFM ratings of all the fans blowing air out of the computer together. This will include the power supply unit fan(s), PCI slot exhaust fans and in some cases the graphics card fans. (Some graphics cards have their own exhaust systems.) Call this value E

Determining the CFM sum for openings in the case:
As this value could be positive or negative we can assume that this value will always be equal to the total value of the CFM of air leaving the case. Without intake fans this would be true as the same amount of air will replace the air leaving the case.

Calculating the intake CFM needed:

Internal fans like your CPU and graphic card cooling fans CFM rating can be used to help determine the minimum CFM intake. Intake fans CFM rating must be at least but preferably higher than these combined as this is the minimum amount of air that the computer uses for cooling. When your total CFM sum entering the case (after filter rating is subtracted) is more than the CFM sum leaving the case through the fans it equate to positive pressure. The surplus air will force its way out of the case through any other openings like optical disk drives, card readers etc. and so help to keep these components clean.

Calculation:

1) Determine the value of C

2) If you use DEMCiflex Filters the value of F will be 20%

3) Multiply F with A. This value is T

4) T has to have a bigger value than C and bigger than E to achieve positive pressure with adequate cooling. If the T value is smaller than C the components will not get fed enough air to satisfy its demand for cooling. If T is smaller than E negative pressure will be present forcing air(and dust) to be fed through all the unfanned openings to satisfy this demand.

- http://www.demcifilter.com/c48/Performance.aspx

* Silverstone claims 65% retained airflow with their nylon filters (http://www.silverstonetek.com/techtalk_cont.php?area=&tid=wh12_008)

thumb.gif
Edited by AlphaC - 9/1/13 at 9:12pm
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post #2 of 11
Do you know where they ship from because the shipping is really high for me.
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post #3 of 11
Looks like they're based in South Africa. Too bad the Corsair 350D top dust filter isn't on sale. frown.gif
post #4 of 11
that is actually a really good price, I paid $33 for my carbide 500r side filter. shipped from south africa direct.
    
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post #5 of 11
Thanks AlphaC, These will come in handy!
budzos
post #6 of 11
Quote:
Originally Posted by CTC626 View Post

Looks like they're based in South Africa. Too bad the Corsair 350D top dust filter isn't on sale. frown.gif

I was actually just look at it the other day. ~$14 for the part is totally reasonable, but an additional $12 just for shipping is insane.
post #7 of 11
Quote:
Originally Posted by Jon55 View Post

I was actually just look at it the other day. ~$14 for the part is totally reasonable, but an additional $12 just for shipping is insane.

even more insane is what im lookin to get is only $6 but shipping is twice that xD
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My System
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CPUMotherboardGraphicsRAM
i7 920 DO p6x58d-e EVGA gtx 260 c216 3x2 gskill @1714 7-8-7 
Hard DriveOptical DriveOSMonitor
3xWD 640 cav blue 1xf3 none atm win 7 x64 ultimate I-Inc 25" 
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by cr33ds View Post

Do you know where they ship from because the shipping is really high for me.

It's free shipping for me for the monthly specials. smile.gif

Not sure for other countries, however.
Edited by AlphaC - 9/2/13 at 1:10pm
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post #9 of 11
Quote:
Originally Posted by AlphaC View Post

It's free shipping for me for the monthly specials. smile.gif

Not sure for other countries, however.

I just checked and ur right, free shipping for the specials smile.gif
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3xWD 640 cav blue 1xf3 none atm win 7 x64 ultimate I-Inc 25" 
KeyboardPowerCaseMouse
Dell ~$5 Corsair Hx850 Antec 1200 g5 
Mouse Pad
Razer Goliathus 
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My System
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CPUMotherboardGraphicsRAM
i7 920 DO p6x58d-e EVGA gtx 260 c216 3x2 gskill @1714 7-8-7 
Hard DriveOptical DriveOSMonitor
3xWD 640 cav blue 1xf3 none atm win 7 x64 ultimate I-Inc 25" 
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Dell ~$5 Corsair Hx850 Antec 1200 g5 
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post #10 of 11
the price is as much as a HIGH quality fan itself..
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Overclock.net › Forums › Overclock Marketplace › Online Deals › Expired Deals › [Demciflex] $25 shipped oversized 200mm and 140mm filter , $17 200mm filter, $15 shipped dual 140mm filter,