Got my system all installed now just need to balance it all. It's far from a perfect system, I'm sure the efficiency is very low, mostly due to the ducts running uninsulated down the roof void but also uninsulated connections in the attic that I still need to sort out.
Still I'm very happy with it, it's been running nearly two weeks now and the house just feels fresher and less stuffy.
I bought the unit used reconditioned off Ebay for £320 and spent less than £500 on all the ducting, vents, connections etc. Just need to decide if I should upgrade the filters now.
I've bought a cheap anemometer off Amazon for the balancing, I'm sure it'll be far from perfect but hopefully enough to roughly balance the system. Anyone tried it before? Am I just wasting my time?