Features LFIS-B-12118 Indoor Units1. Features1.1 Overview Compact design, super slim body size, less space requiring in installation Each louver can be separately controlled, more comfort air blowing is possible. Auto-lifting panel design, more convenient to clean and maintain the filter.(optional)Old Cassette New slim cassette Volume changeDimension18K-24K: 840*230*840 18K-24K: 840*203*840 13.3%↓30K: 840*300*840 30K: 840*203*840 47.7%↓36K-48K: 840*300*840 36K-48K: 840*245*840 22.4%↓1.2 Fresh air intake function Fresh air fulfills air quality more healthy and comfortable. Ventilation motor is optional to increase the effect of fresh air.