I’m doing a “hybrid” install as like @joe90 I picked up a decent Mitsubishi/Kingspan unit for less than £60 in an auction and it was brand new.    So far I have the terminals and the ducts in back to the location the unit will be placed - I will most likely build a silencer as part of the distribution system.      I used a spreadsheet to work out the duct velocities and found that I could drop to 55/63 standard electrical duct for the distribution with no real issu
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