The dryer is 30Amp/220v, 220 should be fine v 240.
The adapter is splitting 1 220 to 2 110. I think technically it is perfect for the miner 🤷♂️
Discussion
220 vs 240 no problem. these numbers have changed over time, so devices tend to work in a range. does the miner's power supply have 2 110 plugs? I am pretty familiar with residential and industrial power, but only a little experience with mining. why wouldnt the miner want to plug right into the 240 dryer outlet?