Heat recovery

[armb]

Got around to changing the filter in the second heat recovery ventilator and reorganising its trunking to allow for it no longer sucking from the long gone cooker hood. But plugging it in does nothing, so I suspect the cooker hood change needs some rewiring to be done too. (I think it was responsible for it running at full speed regardless of the switch position before, which was one of the reasons we unplugged it in the first place.)