Rentals Compressed Air Systems, Inc. maintains a fleet of rental units in stock and ready to go. Electric stationary units or portable diesel are available. Whether for emergencies or temporary air, long term or short term C.A.S. has you taken care of. We have a large delivery fleet as well to get you back online fast. Call our toll free line 24 hours a day 7 days a week @ 800-626-8177 for fast courteous service.