What does "Speed rated at zero pressure" mean?

Firebird-jpx · 9 Nov 2013 at 12:40

Dear Members,

Please can you tell me what "Speed rated at zero pressure" mean?

I only ask as I have purchased a 80mm Fan on e-bay and within the description it states "Speed, 4500RPM at rated voltage and zero pressure."

Link: No competitor links.

Sorry to ask this 'PC fans for dummies' question.

Regards, Jonathan

Firebird-jpx · 9 Nov 2013 at 16:36

Anyone know this meaning???

AtaRo · 9 Nov 2013 at 16:50

Did you ask the egay seller what does it mean?

doyll · 9 Nov 2013 at 17:31

It means the fan speed is rated (specified) with fan having no resistance in airflow.. like setting on a empty bench.

Firebird-jpx · 9 Nov 2013 at 20:22

Dear Doyll,

So does is this the actual speed, just like the "Coolink SWiF2 80mm PWM fan at 750-2000 rev / min , sold on overclockers?

Or will be lower? in reality?

Thanks Jonathan

this mean the same as detailed on most pc fans sold by overclockers? or, will it be lower, as I note from

doyll · 9 Nov 2013 at 20:52

Define "reality".

Resident · 9 Nov 2013 at 21:06

Dear Jonathan,

Not to be a bit of an arse (but I'm going to be). Can I enquire as to why you needed to make a second identical thread 4 hours later than the OP in this one?

Devrij · 9 Nov 2013 at 21:07

Firebird-jpx said:
Dear Doyll,

So does is this the actual speed, just like the "Coolink SWiF2 80mm PWM fan at 750-2000 rev / min , sold on overclockers?

Or will be lower? in reality?

Thanks Jonathan

this mean the same as detailed on most pc fans sold by overclockers? or, will it be lower, as I note from

Good evening Jonathan,

I would say it's safe to assume that CFM is rated with no resistance in all fans.

You're hardly going to place some mesh over it and write up your fan as having 5CFM when flowing through a dirty dust filter. It's the maximum that fan is capable of in an ideal environment.

It's also worth noting the static pressure of the fan you intend to buy if you plan on using it to push through a radiator, for example, since flow rates aren't the only important factor there.

Kind regards,
Dev

doyll · 9 Nov 2013 at 21:09

Resident said:
Dear Jonathan,

Not to be a bit of an arse (but I'm going to be). Can I enquire as to why you needed to make a second identical thread 4 hours later than the OP in this one?

Me thinks you mixed who is and who isn't an arse here.

Firebird-jpx · 9 Nov 2013 at 22:24

Dear Members thank you for your assistance and with the advice gained by Devrij, has cleared the matter for me.

But thank you all for your input, yes even making me smile Resident I re-looked at the forum and considered that I may have placed the question in the wrong place.

Kind regards, to you all once again, Jonathan