Jamoliddin Ergashev, Juramirza Kayumov, Nizom Ismatullaev, Umidjon Parpiev 2020. Theoretical Basis for Calculating the Determination of the Optimal Angle of Rotation of the Slit and Air Velocity. International Journal of Advanced Science and Technology. 29, 3 (Mar. 2020), 12776 - 12784.