Magnetic field effects on Steady free Convective flow through an irregular vertical channel in the presence of viscous dissipation is considered. The dimensional governing equations of the problem involving continuity, momentum and energy equations were non-dimensionalized. The dimensionless non-linear coupled differential equations were solved using Adomian Decomposition Method (ADM) with mathematica 11.0 software. On velocity and temperature, the effects of different fluid parameters were observed and presented both graphically and in tabular forms. It was observed that increase in viscous dissipation parameter enhanced both velocity and temperature profiles while a rise in magnetic parameter retarded both velocity and temperature distributions of the fluid.