At 2308 on September 18, Company 5 was alerted to an automatic fire alarm at 1450 N. Atherton Street, Hoss’s restaurant. While in route, the box was upgraded to a building fire with multiple calls indicating fire on the roof. Engine 514 arrived and confirmed smoke showing from the roof and a smoke condition in the building. The Engine Crew pulled a handline to the kitchen and discovered a fire under the hood unit with the fire suppression system active. Quint 527, working as a Truck, arrived and sent a crew to the roof to start ventilating the smoke. Since the automatic fire suppression system did its job, crews were able to concentrate on ventilation.