Blowers vrs. fans?

mccoyn · Dec 9, 2003

I see a lot of blowers that are rated around 10 CFM, yet have high noise levels when compared to fans. Whats the advantage of a blower? Is it better at pushing through a heatsink? How much better?

I have a 30 CFM fan pushing through a rather constrictive heatsink. Would it cool better with a blower? Might it be quieter?

Yuriman · Dec 9, 2003

Blowers normaly are less annoying, they buzz less. They also have a lot more pressure, and have no dead zone in the middle. With a 92mm tornado and an slk900, you may only get air over 20% of the sink, with a blow its 100%.

cstarritt · Dec 9, 2003

you have to understand that CFM is a function of static pressure. the more resistance, the less flow. blowers move air agianst pressure alot better than axial fans do. with a 30cfm fan and a 20cfm blower, the static pressure might be near the max the fan will push air agianst, and you will get like 10 cfm actualy, whereas a 20cfm blower might give you 15 cfm agianst that pressure, even though its unresricted flow is 10 cfm lower. also, while the DB rating may be higher, the noise is more a sound of rushing air than a fan's high pitch annoying whine. blower noise is much more tollerable.

Valk · Dec 9, 2003

I would be interested to see if there are blowers on the marktet right now that can match my smart fan 2. even thogh blower fans ARE more efficiant, thats 78 cfm to beat. although, if such a blower can beat it, im all over that. the dead spot on my sk7 is immense. somthing iwant to correct.

Robrules18 · Dec 9, 2003

Valk, what ou should be aksing for is an 80mm blower that will beat a SF2 ive seen a 400 some CFM blower out of a furnace before and the one in my house is at least that probably.

IT would probably shoot the CPU out the back of the case

Valk · Dec 9, 2003

wicked
I might jump into building my own blower. just rape an old smart fan 2 of its motor

I built a little injection molding machine a while back to make model airplane parts. i could potentially build a blower fan quite easily

. oh well.

too lazy for that right now. I just want a more powerful aero fan if i can get it =\

archilochus · Dec 9, 2003

Like the guys were saying ,no dead spot in frt of the hub.This LINK will illustrate that point. THE FANMAN

FAN LINK

You may have to wait for page to load completely

cstarritt · Dec 9, 2003

my next upgrade is two of these blowing into a sunbeam duct kit. i got one off ebay for about 10 bucks shipped, but i still need one more.

http://www.comairrotron.com/DCBlowers/SpinnakerDC.htm

almondboy72 · Dec 9, 2003

the jet blower from vantec is soo nice and quiet

vonkaar · Dec 9, 2003

The blower on my heatercores pushes 770 CFM at 48v... I have it running at 36v. It's *much* quieter than a Thermaltake Smartfan 2.

IMO, the jet blower is hardly worth calling a 'blower'. Ya'll can get *real* blowers on Ebay for under $10. The main downside to using a blower over an axial (or tubeaxial) fan is size. My blower is 10"x7"x6.5"... not *enormous* but still a 'bit' bigger than a 120mm fan =p.

7keys · Dec 9, 2003

Get yourself an old hair blower and take the heating Mechanism out of it.

archilochus · Dec 9, 2003

This is what I found.The air pressure on the 2 fan types are as
follows.Thermaltake SF II: 8.43mm H2O @ 4800rpm / dBA 48.0
Aero Blower: 10.7mm H2O @ 3500rpm /dBA 37.5
80x80x70 mm. THE FANMAN

snowwie · Dec 9, 2003

http://store.yahoo.com/directron/sunon.html

there are some decent, compact blowers here

now you just need to find a way to mount them to utilize to small area that they blow on.

biyonic · Dec 9, 2003

A blower (but not the kind for sale for computer users) is overkill for any PC. It is by design used to overcome static pressure in an air handling system. There is little static pressure in a computer application. That is, unless you are ducting from a remote location through rough duct. Or, if you want to add one for visual effect - which is cool if that's your thing.

cstarritt · Dec 9, 2003

well i got my blowers blowing into a duct, and i sit them on top of my psu. i also plan on ducting the 120mm fan hole they are feeding though down to ground level so its not sucking in hot exahust air form teh psu. they blow alot more air though my duct kit than a sf2 on high, and with less noise. and if i crank them up, they make alot of noise, but man do they move air.

one problem i have with them right now is the duct makes a very sharp turn at the HS, and the air all comes out one side of teh duct, so only one side of teh hs gets a good flow across it. i want to mod it so the air goes in at the side of the hs (tape off top) and comes out the other side.

vonkaar · Dec 9, 2003

biyonic said:
A blower (but not the kind for sale for computer users) is overkill for any PC. It is by design used to overcome static pressure in an air handling system. There is little static pressure in a computer application. That is, unless you are ducting from a remote location through rough duct. Or, if you want to add one for visual effect - which is cool if that's your thing.

Dual heatercores. If I use even the 'best' of 120mm fans, I can still feel very little pass through the heatercores. If I crank that up and use a 178mm fan, I feel a lot more, but it still is very little in comparison to my blower, which is far quieter *and* more powerful than any axial fan I could use (within comparable dimensions).

Definitely not impractical. If you are talking about using a blower for case circulation, you are more correct, but I could still feasibly see a use or two ^_^.

biyonic · Dec 9, 2003

I'm trying to make it clear that there are PC-grade blowers and industrial blowers. I could be wrong but the blowers I think you have are light duty PC jobbies. Which are great for what you are using them for because they are quiet and low voltage DC - yes?

See the article database for a true industrial Granger catalog blower. Now that is a blower. With that kind of blower you are looking at $$$ and AC voltage which I would stay away from in a case modding application.

Robrules18 · Dec 9, 2003

im sure they have blowers that put out several thousand CFM and are almost silent besides the massive whoosing of air... But they are probably as big as your case.... So Unless you get a small one made for PC youll have tyo mod it but it will give you excellent results.

vonkaar · Dec 10, 2003

The blower I use is designed for cooling electronic test equipment. The only blowers that would be usable in a computer *would be* those that are designed for more than a light breeze. Heater-core blowers (as defined in a car-mechanics' vocabulary... ie, the real thing), rack-mount blowers and AC blowers all fit this description.

Like I said above, it's only 10"x7"x7". Very small... very quiet... very powerful. You could probably do just as well with an even smaller automotive blower.

NiTCOM · Dec 10, 2003

mccoyn said:
I see a lot of blowers that are rated around 10 CFM, yet have high noise levels when compared to fans. Whats the advantage of a blower? Is it better at pushing through a heatsink? How much better?

I have a 30 CFM fan pushing through a rather constrictive heatsink. Would it cool better with a blower? Might it be quieter?

I bought a blower ones and have to say: stay away.
I make more air by farting than this blower can provide.

Blowers vrs. fans?

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