I am drawing up the duct routes this week ready for some 1st fix progress and I have two options for MVHR. Reading the threads here it looks like there is a requirement to separate the intake and exhaust of the MVHR by 2 to 3m and keep them on the same (ideally sheltered) wall. Both of my options achieve this, but does it make a difference if the separation is vertical or horizontal? Option 1 has vertical separation with the intake low down on the wall (apprx. 3m above ground) with the exhaust j