Air natural convection on a vertical isoflux plate with a downstream unheated extension and a facing parallel shroud has been experimentally investigated, for different values of the wall heat flux and of the geometrical parameters. In most configurations the adiabatic extension improves the thermal performance of the channel. For the larger values of the channel aspect ratio (Lh/b = 10) the system with a geometrically asymmetric chimney performs better than that with a geometrically symmetric chimney. Maximum wall temperatures and average Nusselt numbers are correlated to the thermal and geometrical process parameters, in the ranges Ra* B/b = 3.102 − 105 and L/Lh = 1.5–4.0.

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