On December 14, 2019 @ 14:38 hrs, Units were dispatched for smoke inside a commercial building at King George Nails. Engine 1 AOS to find a middle of the strip store with nothing evident from 3 sides. Charlie side report confirmed nothing evident from all sides. Battalion 1 established Kings Hwy Command and E1 began investigating - Issue narrowed down to malfunctioning HVAC system. Power was attempted to be secured to unit, however breakers were not marked in the panel box. Main breaker was turned off. Shop was ventilated. Command terminated and Units cleared the scene at 15:37 hrs.