Exo-inulinase involved in utilization of the plant storage polymer inulin, consisting of fructooligosaccharides with a degree of polymerization (DP) value from 2 to 60. Splits off terminal fructose units successively from the non-reducing end of the inulin molecule, and also hydrolyze sucrose and raffinose. Hydrolysis of terminal, non-reducing (2->1)- and (2->6)-linked beta-D-fructofuranose residues in fructans. The catalytic activity is increased by manganese cathions, but strongly inhibited by other metal ions such as cupper, aluminum, silver, iron, nickel, zinc and magnesium cathions. Optimum pH is 4.0 when inulin is a substrate and 5.0 when sucrose is a substrate. Optimum temperature is 60 degrees Celsius when inulin is a substrate and 55 degrees Celsius when sucrose is a substrate. Belongs to the glycosyl hydrolase 32 family.