At 0745 hours on Monday November 16th, Company 7, Engines 121 (Stonewood VFD), 11 (Anmoore VFD), and Ladder 521 (Bridgeport FD) were alerted for a Commercial Structure Fire at Nutter Fort Elementary School on Buckhannon Pike. Engines 71, 72, and Squad 7 responded with 10 personnel and all arrived on scene in less then 5 minutes of dispatch to find nothing apparent from the exterior and all occupants evacuated. Making entry into the Intermediate Side, crews were met with a heavy smoke condition in the front lobby, cafeteria, and hallway area to find a Working Fire in the ceiling. The fire was quickly extinguished using 2 pressurized water cans as a 1 3/4” cross lay was advanced inside. Ladder 521 arrived on scene and laddered the roof to the rear of building to check for extension as the fire was contained to the schools air conditioning system. Crews checked for extension with negative findings with multiple PPV Fans set up in various locations for ventilation. After extensive ventilation and turning the scene over to HCBOE Maintenance, crews returned home at 0900 hours.