I'm trying to get my head around how the MVHR ducting should be routed. We're planning to have the MVHR in a downstairs plant room. Running the ducting into the first floor trusses (these are 253mm metal web joists) is straightforward and I guess the ground floor can be easily covered with ceiling terminals.  Most of our upstairs rooms have fully vaulted ceilings and I'm struggling to work out how the ducting would make its way to the appropriate sloped ceiling. Do the terminals need to be in th