Leakage through cracks. Comparison of deposition and penetration through cracks and leaks obtained with the Nazaroff equations for deposition and leakage. Note that the particles with smaller deposition rates also penetrate through cracks more efficiently. Crack dimensions: width = 0.20 mm, length = 4 cm, pressure difference = 4 Pa, air flow conditions: K = 0.5, cubic room (3x3x3 m). All values taken as representative of realistic cracks by .