Experimental data for heat dissipation from five duralumin vertical rectangular fin-arrays with the base horizontally oriented were measured. These measurements were to extend data obtained earlier from aluminum fin-arrays using the same experimental system and method. Data collated from earlier and present work covered the range of inter-fin separation distances from 6.25 to 7.95 mm. The range of the fin base excess temperature above the ambient air temperature, however. was quite extensive, from 19.0 +/-0.1;degreesC to 125.0 +/-0.1 degreesC. The fin length range was from 127 to 254 mm. the height from 6.35 to 38.10 mm, the thickness from 1.02 to 3.10 mm and the number of fins per array from 10 to 33. Relevant non-dimensional parameters formulated by earlier similarity analyses were used to generalize the data. Two types of correlations, one which used the inter-fin separation distance as the prime geometric parameter, and the other, which used half of the fin length, were presented and deviations discussed.