This protein is a fructanase enzyme which degrades levans and inulins to fructose and also cleaves sucrose into glucose and fructose and can therefore function as an extracellular invertase. Hydrolysis of terminal, non-reducing (2->1)- and (2->6)-linked beta-D-fructofuranose residues in fructans. By sucrose, fructan substrates and fructose. Belongs to the glycosyl hydrolase 32 family.