DAF design parameters are detailed for proper system operation. The manager or operator will learn the key areas that must be accounted for such as rise rate, air to solids ratio and hydraulic loading rate. All of these factors determine a DAF's performance envelope. The data used to calculate that envelope may be found on product literature, websites and simply taking a tape measure to the actual quipment and reading their labels. With this information systems may be compared against each other and the claims made by the manufacturer.