Detailed 3D RT modelling of the orbitally modulated He i λ5876 line we observe in MWC 314 at φ = 0.444 (thin drawn solid line) and at φ = 0.795 (boldly drawn solid line). The best fit to the P Cyg absorption at both orbital phases (dashed lines) requires an asymmetric distribution of wind density around the primary star with the density enhancement factor f = 3.3 in Eq. (6). The absorption line computed with the model of f = 10 is too strong at φ = 0.795 (dotted line).