The free lift function enables the forks to be lifted to a certain height with the mast at collapsed height. In some applications the trucks need to enter and exit doorways, which could be a reason to choose a mast with free lift.
Perform a walk-through of your building and measure doorway heights to learn your lowered or collapsed height requirement. If your forklifts also operate on lorries, or work outside under a roof, you need to take these measurements into consideration too.