I live in a relatively new house, about ten years old. The builder installed a fan in the downstairs living room using a pancake box mounted to a beam. Because of this, running the fan causes a loud hum and causes vibration in the floor upstairs above where the fan is installed. Is there a dampener I can install between the pancake box and the beam? I have tried multiple fans but all cause the same vibration hum do to the box being mounted to the beam.