Engine (6), Squad (3), and Chief 133 responded with mutual aid partners assisting at 1176 Harrisburg Pike for smoke in the basement. E33 crew split for investigation and stretching a hand line. Squad 33 established ventilation. Crews believe the cause was a ceiling mounted fan. Truck 39 checked the roof as well. Crews ventilated the basement before clearing the scene within 45 mins. While this incident was winding down, U133 handled a medical assist.