Involved in the degradation of plant cell wall polysaccharides. Catalyzes the deacetylation of acetylated birchwood xylan and glucomannan, with a large preference for the latter, and of the synthetic substrate 4-nitrophenyl acetate (4-NPAc). Deacetylation of xylans and xylo-oligosaccharides. kcat is 49820 min(-1) for the deacetylation of 4-nitrophenyl acetate. kcat is 66 min(-1) for the deacetylation of birchwood xylan. kcat is 1348 min(-1) for the deacetylation of glucomannan. Glycan degradation; xylan degradation. Belongs to the carbohydrate esterase 2 (CE2) family.