In this study parallelogramic cavity is modelled as an air-filled enclosure bounded by two isothermal and two insulated walls. The insulated walls are inclined at an angle delta to the vertical plane. The basic governing equations i.e., conservation of mass, momentum and energy are solved by the numerical solution technique developed by Gosman et al. [1, 2]. Average heat transfer coefficient based on the temperature difference of vertical walls indicates that the direction of heat flow plays an important role in the rate of heat flow.