Thanks for the Comments --
So what you can't really see from the pictures ::1) There is a window directly behind them, which is open - so Hot Air is expelled directly out the window -- with all three running all night at 700mhz the average blade Temp was around 59 and all day today 64 (with the doors closed) if I leave the door open this will probably improve
2) Whilst It looks like They are all running off one socket - One of the really untidy cables hanging from the roof is where I have pulled an extension from another socket, so I have two running off one socket ,, and another off another socket - each with its own surge protector It's 240v 16A plug
All runs great -- except today when our domestic worker plugged in the Iron, in another room and that plug point happened to be on the same circuit as the two miners -- so it tripped the breaker --- Solution - She must pick another room to iron in
One day when I want to get more miners I'll have to look at pulling another circuit from the db board --