Endoglucanase that has highest activity on the linear beta-1,6-glucan pustulan and lower activity against laminarin (beta-1,3-glucans with beta-1,6-branches). Is active on C.albicans cell walls allowing the release of a previously described cell wall proteins. Random hydrolysis of (1->6)-linkages in (1->6)-beta-D-glucans. Optimum pH is 4.5. Belongs to the glycosyl hydrolase 30 family.