pc case help

[daveheath999]

Hi building my first pc and already got the nzxt h7 flow 2024 and was wondering what to do about fans, it comes with 3 120mm fans but they are 3 pin ones so thinking about replacing them, according to the specs i can have :

top 3x120mm or 2x140mm.
1 rear 120mm or 140mm.
3 front 120mm or 140mm.
3 bottom 120mm.

thinking 3 bottom 120mm,1 rear 140mm,3 front 140mm and 1 or 2 top 140mm.
any advice.
priority is quiet so will probably run them at low speeds.
don't want to spend a fortune.
will probably spend more on the 1 rear fan than the other fans individually.

[leclod]

1 hour ago, daveheath999 said:

but they are 3 pin ones so thinking about replacing them

Why replace them? they probably are fine, I'm using two 3 pin fans in my system

And 3 fans is a good start, it's probably enough. I'd stick the 3 fans in the front and I'd wait and see.

Air will find it's way out.

Edited September 8, 2025 by leclod

[FilipposTechGR]

2 hours ago, daveheath999 said:

Hi building my first pc and already got the nzxt h7 flow 2024 and was wondering what to do about fans, it comes with 3 120mm fans but they are 3 pin ones so thinking about replacing them, according to the specs i can have :

top 3x120mm or 2x140mm.
1 rear 120mm or 140mm.
3 front 120mm or 140mm.
3 bottom 120mm.

thinking 3 bottom 120mm,1 rear 140mm,3 front 140mm and 1 or 2 top 140mm.
any advice.
priority is quiet so will probably run them at low speeds.
don't want to spend a fortune.
will probably spend more on the 1 rear fan than the other fans individually.

No need to fill every slot airflow is more about balance than max fans. Here’s what works best on the H7 Flow:
Front: 2×140 mm intakes bigger blades = same airflow at lower RPM = quieter.
Rear: 1×140 mm exhaust worth spending a bit more here since it’s the constant path for hot air.
Top: optional 1–2×140 mm exhaust if you notice heat build-up, but not required if front/rear are solid.
Skip the bottom intakes unless you’re running a very hot GPU – they add dust/noise without huge benefit in this case.
Also:
Go for PWM 4-pin fans, not 3-pin DC, so your motherboard can ramp them down when idle.
On a budget, Arctic F14 PWM or BeQuiet Pure Wings 2 are solid. If you want one premium, get a Noctua or Phanteks 140 mm for the rear slot.
That way you’ll have a very quiet system with smooth airflow without overspending.

[daveheath999]

3 hours ago, FilipposTechGR said:

No need to fill every slot airflow is more about balance than max fans. Here’s what works best on the H7 Flow:
Front: 2×140 mm intakes bigger blades = same airflow at lower RPM = quieter.
Rear: 1×140 mm exhaust worth spending a bit more here since it’s the constant path for hot air.
Top: optional 1–2×140 mm exhaust if you notice heat build-up, but not required if front/rear are solid.
Skip the bottom intakes unless you’re running a very hot GPU – they add dust/noise without huge benefit in this case.
Also:
Go for PWM 4-pin fans, not 3-pin DC, so your motherboard can ramp them down when idle.
On a budget, Arctic F14 PWM or BeQuiet Pure Wings 2 are solid. If you want one premium, get a Noctua or Phanteks 140 mm for the rear slot.
That way you’ll have a very quiet system with smooth airflow without overspending.

thanks for the reply, having a look at your suggestions, but cannot find the bequiet pure wings 2 anywhere.

[FilipposTechGR]

5 minutes ago, daveheath999 said:

thanks for the reply, having a look at your suggestions, but cannot find the bequiet pure wings 2 anywhere.

If you can’t find BeQuiet Pure Wings 2, two good alternatives in the same quiet but affordable
range are:
Arctic F14 PWM PST → usually easy to find, great value, daisy-chain support.
Noctua Redux 140mm → a bit pricier, but excellent acoustics and availability.
Both are solid replacements. If you want RGB options, Phanteks SK 140 PWM are also decent and not too loud.

[daveheath999]

i can get the be quiet Pure Wings 3 140mm for £10 any good?

[daveheath999]

hi, i can get these : 

be quiet Pure Wings 3 140mm PWM Fan £9.95
be quiet Pure Wings 3 140mm High Speed PWM £9.95

 

both the same price but one is high speed, both 4 pin,