Under stair server ventilation

[Reddax]

Hi,
I've recently moved my server to my under stair closet. I've been monitoring temps and at low usage, the two CPUs sit at around 45 degrees. However once starting to hit max load they start to hit around 80 degrees, still safe temps but the room becomes extremely hot, the server case hot to the touch. This isn't surprising as there is no ventilation into/out of the room.

What can I do to add ventilation?

 

[Reddax]

Do you have a crawl space you can pull some cooler air in from, then extract out of the side of the house?

I've had a watercooling radiator mounted in the crawl space also to keep the heat out of the house. Worked really well.

It's a new build house, there's no crawl space(That I know of - no obvious hatch) and the back wall of the cupboard is the shared wall with the next door house

 

[Reddax]

I have a similar setup, server and pc under the stairs with no external air capability.
Mine aint too bad as i have nothing but the kit under there so a lot of space for the hot air to cool in, you need to empty that cupboard and it might help.
I was thinking of putting a couple of stair vents in, behind the carpet so they wont be particularly effective though.

I've cleared out and given the server half of the room, i've also manually ramped the case fans & CPU fans as the cpu temp control doesn't work. Temps have lowered significantly with it now maxing out at about 65 degrees for the CPUs whilst the door remains shut, even on a very warm day like today (25 degrees). I'll keep an eye.

Thanks all