This document describes modeling and simulation of a ducted axial fan for one-dimensional flow. It presents the governing continuity, momentum and energy equations. It derives the flow model using radial equilibrium concepts to compute pressure rise as a function of whirl velocity, rotor speed and blade diameter. A Simulink model is developed using typical blocks to simulate the one-dimensional flow model. Results show that maximum pressure rise occurs at higher rotor speeds, pressure ratios and larger blade diameters. Flow modeling and simulation helps optimize pressure rise for different operating parameters of the ducted axial fan.