new fan design

[mrwill]

LINK
Anybody heard of these? Are the numbers really true or just hype? That is, 1200 RPM, 18 db, and 94 CFM.

 

[Deleted member 184142]

100% bullshit, and I am willing to put money behind that. You are NOT going to get 90+CFM from a (120mm) 1200rpm fan, no less at 18dBA, I think SilenX has just lost their crown at the top of the BS meter. They also look to almost be copies of SilenX fans but with more blades added (and one ugly color scheme substituted for another). http://www.newegg.com/Product/Product.aspx?Item=N82E16835226024

 

[BillParrish]

Ran into this a week or so ago. Fan is really rated in Cubic Meters/Hour but whomever did the ad had no clue and entered it as CFM.

To covert divide by 1.7 so 94/1.7 = 55 CFM which is more reasonable.

The db numbers are still difficult to beleive, measured at 3m from fan I bet. Maybe not. Who knows.

 

[Deleted member 184142]

Ran into this a week or so ago. Fan is really rated in Cubic Meters/Hour but whomever did the ad had no clue and entered it as CFM.

To covert divide by 1.7 so 94/1.7 = 55 CFM which is more reasonable.

The db numbers are still difficult to beleive, measured at 3m from fan I bet. Maybe not. Who knows.

I just saw that also, someone did mess up big time on the listing, and yes 55CFM is more doable, but still very doubtful at 18dBA.

 

[Private_Ops]

I just saw that also, someone did mess up big time on the listing, and yes 55CFM is more doable, but still very doubtful at 18dBA.

You have to admit though, that'd be pretty sweet. Especially for us "quiet" users!

 

[Blazestorm]

Only one way to find out eh , someone go buy some

 

[Deleted member 184142]

You have to admit though, that'd be pretty sweet. Especially for us "quiet" users!

It sure would be, and I'm not even saying these are "bad" fans, they might be really good, but they are not going to be THAT good.

Only one way to find out eh , someone go buy some

No, they are not that good, even if you took out the fan and motor noise the pure wind turbulence from 55CFM out of a 120mm port would be over the 18dBA.

 

[undertheradar]

No, they are not that good, even if you took out the fan and motor noise the pure wind turbulence from 55CFM out of a 120mm port would be over the 18dBA.

You are likely right, but 55cfm out of a 120mm port does not mean you will be over 18dBA all the time. It really depends on the obstructions that the air has to pass around. It seems the past few years have led to many advances in this area. For many years, a standard design for blades was used... similar angles, same degree of rake, etc... just different bearings, speeds, etc. Now, companies seem more interested in matching the blade geometry with the airflow, speed, etc. as well as using bullet or cone shaped motor hubs to direct air better than the 'flat disk' we used to see always. Not to mention, if you have airflow noise, removing the guards goes a long way to eliminating the noises. If a fan gets very good airflow numbers with very low noise, it might also be that the blades are set up with a heavy flow bias, and so using them in a situation where pressure is needed (like a radiator) is not going to work so well.

 

[Deleted member 184142]

You are likely right, but 55cfm out of a 120mm port does not mean you will be over 18dBA all the time. It really depends on the obstructions that the air has to pass around. It seems the past few years have led to many advances in this area. For many years, a standard design for blades was used... similar angles, same degree of rake, etc... just different bearings, speeds, etc. Now, companies seem more interested in matching the blade geometry with the airflow, speed, etc. as well as using bullet or cone shaped motor hubs to direct air better than the 'flat disk' we used to see always. Not to mention, if you have airflow noise, removing the guards goes a long way to eliminating the noises. If a fan gets very good airflow numbers with very low noise, it might also be that the blades are set up with a heavy flow bias, and so using them in a situation where pressure is needed (like a radiator) is not going to work so well.

I agree for the most part, and I think the Slipstream fans show this point quite well, however, even they are no where close to 55CFM at 18dBA. And I would still be willing to put money on it.