One of the problems in conventional duct-based air conditioning systems is to feel thermal discomfort since the ceiling height is high in large spaces, resulting in significant temperature differences between the upper and lower levels during heating and cooling and the airflow within the room is stagnant.
Consequently, air conditioning systems that provide a comfortable environment for performances and indoor events are essential. Conventional duct-based air conditioning methods have traditionally been mainly used, but these systems are inefficient due to high installation costs, significant interference with other structures due to duct work, which can lead to thermal stratification and damage to the ceiling structure as well as the heavy loads from the fan body and ducts require truss reinforcement for safety.

The Hi-Jet air conditioning system for large spaces, which uses a variable-direction air circulator, supplements existing installation methods to improve air-conditioning efficiency, and eliminates thermal stratification by generating circulating airflow, realizing the “3-Free” concept through a completely ductless design.