Auto-Air Carts provide fully automatic reserve air for work in hazardous environments. The Auto-Air Cart provides a system approach to breathing air filtration. One unit contains a full Grade-D filtration unit and either a pneumatic or electric reserve air system. Choose a cart size based on the desired amount of reserve air to allow workers to safely egress the work area. The pneumatic versions should be selected in hazardous and potentially explosive environments. Custom Auto-Air Carts available. All BB30 through BB100 series standard carts hold two 87 or 60 cf air cylinders. Optional large cylinder carts are available for long duration applications.