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Cathy,
I have a 3 cabin with a 16k unit under setee at main bulkhead in main cabin with the following ducting. The unit draws 11 amps running with the pump and will start and run fine on an honest 15 amp supply, no problem on a 30 amp supply.
4" duct to feed main cabin near with outlet near the shrould tie down rod.
4" duct thru lower main bulk head to feed pullman cabin, this is split to a 2.5" duct that goes to forward head.
4" duct cut through the setee panel under floor going into bilge area aft of mast and running aft towards aft cabins and split to 2 -2.5" ducts to feed aft cabins, the out put is less but ok with a fan in each cabin and better if doors open.
I used a PVV flexiable 4" and 2.5 duct that is smooth inside, it is very tough and foregiving. It is used for ducting sawdust in wood working shops, I used the splitters offered for same as well. I would like to insulate portions of the ducts with the foil backed bubble type sheet wrap.