@2254 hrs the structure fire assignment was dispatched to 100 McKinley Ave @ Dietrich’s Milk Products for a reported fire inside a dryer chamber. Chief 10 arrived on location @2300 hrs and received the report from Chief 13 of a working fire. Chief 10 confirmed the report of a fire in the base of an oven and requested lines to go into service in the fire room. Engine 11 arrived & picked up the hydrant at Garfield and McKinley and supplied Engine 13. In total engine 13 stretched 3 attack lines into the building. The bulk of the fire was knocked down @2316 hrs and crews started to check for extension. It was determined that there was extension into bag house #1 & #2. Crews went to work to extinguish the remaining fire in the bag houses, command released Tower 79 and Rescue 85 (RIT) @0043 hrs. The remainder of the fire was extinguished @ 0045 hrs, maintenance and management were place on fire watch for the rest of the evening. Companies secured their equipment and went available from the incident @0110 hrs. Thank You to all crews who responded.