Thanks for your suggestion. I will buy a portable version to test venting the air.
I gone through the ups and downs of managing temps in the GPU farm.
The lessons I learnt as follows, hope it helps in your environment.
1. Hot air naturally goes up - so your vent/blower out should be on top to naturally move hot air out of the farm/room.
2. Floor standing fans pointed upwards are useful to get airflow moving upwards - get rid of hot air pockets forming at rig level.
3. Static pressure VS non-Static pressure - use them to help you move hot air quicker. Avoid having outake vents/fans without intake vents/fans. Always have IN and OUT airflow so that no hot air are recycled into the farm/room.
4. The fastest rigs, ie superclocked at supersonic speed, will create lots of heat (probably reduce the lifetime of your GPUs too) and your over stressed PSUs will also produce heat - Beware that most super fast rigs are NOT stable over time. My ETH farm in the early days was a monster of a setup 30-31MHs rigs screaming away and power bill was high. However, they do need reboots due to hang etc. I was using Windows then. Currently, my farm is all Linux using smOS. Only a handful W10 for NVIDIA and test rigs. ETH mining is very very stable, cool and steady hashrate at about modest 26-28MHs rigs resulting hashrate to pool's stratum servers consistently without interruption and zero stales. I stopped ETH mining about 2 months ago. Now NH/Cryptonite and later BTG.
5. I have 2 of those air extractors/blowers - I don't use them often but on very hot days I use them and position the orange hose on top the big rigs (12/13/19 GPUs rigs) zone. My big rigs zone is in the middle of the farm. The surrounding perimeter are all the 6/7/8 GPU rigs.
6. All Deltas and server PSUs are hung like bats -- exhaust pointing upwards.
7. The farm has CCTV and I can remotely monitor environmental like temps and decibels via the CCTV.
8. AC is not required - I tried it ... AC is useless. Unless you are using Data Centre grade AC then that's a different story altogether. Its all about INTAKE and OUTAKE (top) and moving HOT AIR UPWARDS to the top as fast as possible.
Awesome!!! Thanks for sharing. I will apply all this to my rig.
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