Natural convection is a heat transfer process driven by buoyancy forces, occurring when fluid motion results fromtemperature-induced density variations. In tall enclosures, where the height is significantly greater than the width,natural convection exhibits distinct flow behaviors due to the geometric constraints. These enclosures arecommonly found in applications such as solar chimneys, heat exchangers, and building ventilation systems.Understanding the dynamics in these environments is crucial for optimizing thermal performance and energyefficiency. A scale analysis simplifies complex governing equations and helps predict heat transfer and fluid flowpatterns in tall enclosures by focusing on dimensionless parameters like the Rayleigh and Nusselt numbers. Thisapproach aids in designing efficient systems for various industrial and engineering applications.