Beta-glucanases participate in the metabolism of beta-glucan, the main structural component of the cell wall. EXG2 is not heavily involved in the exoglucanase function of the adhesion process. Successive hydrolysis of beta-D-glucose units from the non-reducing ends of (1->3)-beta-D-glucans, releasing alpha-glucose. Induced during cell wall regeneration and repressed by HAP43. Predicted to be a substrate for cleavage by KEX2. Belongs to the glycosyl hydrolase 5 (cellulase A) family.