Horizontal ducted minisplit ducting
I plan on using a Mitsubishi 12K BTU horizontal ducted mini split, Model: SEZ-KD12NA4R1.TH to provide both heat and AC to two second floor bedrooms. The unit would be inside the building envelope in a dropped ceiling in a hallway between the bedrooms. I’m having trouble determining what adequate ducting would be.
The Mitsubishi submittal document has graphs for different static pressure that relate to CFM but I struggle to relate this to a duct design.
The duct would need to be 8′ to one bedroom and 6′ in length to the other. I have a lot of horizontal wall space and the unit is just less than 8″ high. I would like to use that height for the duct. The blower maximum dry CFM is 388.
Any advice would be greatly appreciated. I’m in zone 6A.