Abstract : Accurate kernel dimensions are crucial to designing efficient screen cleaners in maize processing. Reported dimensions in literature are determined for individual varieties. Unfortunately, the open maize market in Ghana contains a mixture of varieties, making literature-reported dimensions impractical for efficient screen designs. We present a comparative analysis of individual variety and open market maize dimensions using Analysis of Variance (ANOVA) and Least Significant Difference (LSD) tests to inform on efficiency of maize screen-cleaning systems.