Hydrolyzes oat spelt and birchwood xylan randomly, yielding xylose and xylobiose as major end products. Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans. Glycan degradation; xylan degradation. Monomer. The N-terminus is blocked. Belongs to the glycosyl hydrolase 10 (cellulase F) family.