Closet cooling and fan static pressure

[kaspor]

Hello

I have a closet which is approx 2.7m high by 1m deep by 1.2m wide. I have l equipment in there that needs to sit at max 30degC. There are two double doors on the closet.

In order to keep it at 30degC I’ve installed 4 extraction fans on a thermostat. The fans draw air in through gaps in the doors and from underneath and exhaust it at the top. The fans are similar to these

S Series 100 Wall/Ceiling Exhaust Fan – White - Universal Fans

The Fanco S Series exhaust fan is a small yet capable fan. It features a simple design and can be mounted on the ceiling or wall. It can also be connected to duct so the air may be exhausted out of the house.

universalfans.com.au

The problem is the noise. They’re generation 30dba each. I’ve insulated them as much as I can but they’re still loud.

So I then started looking at quieter fans such as these

NF-S12A FLX

The NF-S12A marks the third generation of Noctua’s signature S12 series quiet case fans, which have received more than 250 awards and recommendations from the international press. Featuring a further refined blade design with Anti-Stall Knobs that works in tandem with the new AAO (Advanced...

noctua.at

They have a much lower db but looking at the performance curve it looks to have a much lower static pressure rating

NF-A12x25: performance comparison to NF-F12 and NF-S12A

Designed in Austria, Noctua's premium cooling components are renowned for their superb quietness, exceptional performance and thoroughgoing quality.

noctua.at

Does this mean they will inherently take longer to get the temp in the closet down as they are not able to draw the same amount of air in?

I’m worried that if I change the fans over that the newer fans will be useless as they won’t be able to draw air in like my current ones.

Also cutting holes or vents for intake isn’t an option unfortunately.

 

[LittleInch]

This is all very odd.

You have something generating heat inside your wardrobe?

Which is in your bedroom??

Four fans that size for something that small is absolutely nuts.

You need to provide a very low resistance to air flow coming in. At the moment I doubt those fans are drawing in more than 10% of their maximum flow and possibly less.

Or find some other way of cooking whatever it is you have hiding in your closet.

What heat flow are we talking here or ach in the closer??

 

[kaspor]

Thanks for the reply. It’s all of my server equipment. It’s a closet in the home, not in my bedroom.

Because of the enclosed space heat eventually dissipates within the closet and it gets to 6 degrees above ambient. Ambient temp can get up to 28deg.

I would love to have a bigger area for airflow coming in but that would mean cutting a hole in the door or a hole in the wall which I want to try and avoid.

The fans work well but they’re noisy.

I think the Noctua fans which are renowned to be very quiet would not work well because they don’t have a high enough static pressure rating?