BL26 N means number of plates. Length (mm): 325. Width (mm): 111. Thickness (mm): 10+2.35N. Weight (kg): 1.3+0.13N. Channel volume (L): 0.025(N-2). Exchange area (m2): 0.026(N-2). Working pressure: 3.0Mpa. Testing pressure: 4.5Mpa. Working pressure: -160grC ~ 225grC