I have not done this myself but the heater delivered from the Hanse in the 350 is mounted in the back behind the aft cabins. Mine is on the portside. The air hoses goes in on the starboard side, in the same place where the exhaust from the engine comes out to this "room". On mine there is a split to the second aft cabin before it runs on the starboardsiden, splits again for the outlet to the starboard aftcabin which is under the closet. It the runs under the pentry and splits again to the main opening (the one you can not close) just in front of the pentry. It then runs forward, now reduced from 90 mm outlet to 60 mm, it splits again just in front of the forward cabin. The to last outlets is the under the closet in the forward cabin and the longest runs under the step up to the bed in the front cabin and in to the toailet...