What is the unrestricted flow rate of the DC515 Vacuum? Support November 23, 2020 14:32 Updated Follow The unrestricted air flow rate is approximately 32 CFM. Related articles What is the CFM or Airflow rating on the DC500 cordless vacuum? What is the maximum static pressure for the DC500 cordless vacuum? What is the difference between MAX, XR, and ATOMIC? Where can I start an online warranty repair claim? What is the model number of the hepa filter for the DC500 cordless vacuum? Comments 0 comments Please sign in to leave a comment.