Toshiba Compact cassette U2 4-way trial split air conditioner 9000+9000+12000 BTU inverter A+++ external unit 5.2 kWToshiba Compact cassette U2 4 way trial split air conditioner 9000+9000+12000 BTU inverter A+++ external unit 5. 2 kW The air conditioner kit is equipped with the following indoor units: 2 x 9000 BTU Ideals for rooms from 15 to 25 sqm with an average height of 2. 7 m 1 x 12000 BTU Ideal for rooms from 25 to 40 sqm with an average height of 2. 7 m In Toshiba's Natur32 range we find the compact U2 Multi cassette : new in functionality and design