This feature is also useful for analyzing problems in existing systems where the duct sizes are already specified. The demonstration copies retain all the functionality of the full programs, they are just limited on the size of the project data that can be entered. The computer must have either two floppy disk drives or one hard disk drive and a floppy drive. The program can calculate using either the static regain, equal friction, or constant velocity methods. The user's manual gives detailed information on the exact equations used, and explains how to manually verify program results.
All input data is checked at the time of entry so that no improper data can be entered.
Upon completion of the input process, all data is saved to disk and can be reviewed and edited whenever desired. The general project data includes the project name, location, client name, duct material, desired sizing method, and more. The fan system data includes the fan type, minimum and maximum allowable air velocities, desired noise levels and more. The trunk and runout data includes such information as duct length, connection numbers, material type, insulation R-values, fitting quantities, runout cfm values, and any duct height and width constraints. Input sheets are provided for the easy data entry.