●Built-in PCB board with high tech controller
●Design for a high-efficient fan with low-noise
●Variable wind volume due to pressure difference (automatic speed control)
●Silicone packing with down-type cover provides close installation of the ceiling and blocks micro-vibration
●Stable cover installation using cover bolts
●Strengthening durability by installing the ball bearing motor
●Fire prevention and safety from overheating by installing a safety temperature fuse
●Reverse flow prevention damper built-in
●LED operating indicator (basic)