cannot do trunking thru thick toilet walls, so my aircon guy said to run it thru the kitchen wall (hidden in cabinet) and then hack a small hole at the side of the yard door frame to run the trunking to the yard and then aircon ledge...no need to remove yard door at all. I'm not sure whether the space allowance at the yard door frame is the same for S1 and S2. Mine is S2.