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We explore the gauge coupling relations and the unification scale in F-theorySU(5) GUT broken down to the Standard Model by an internal U(1)Y gauge flux. Weconsider variants with exotic matter representations which may appear in theseconstructions and investigate their role in the effective field theory model.We make a detailed investigation on the conditions imposed on the extraneousmatter to raise the unification scale and make the color triplets heavy inorder to avoid fast proton decay. We also discuss in brief the implications onthe gaugino masses.

Gauge coupling flux thresholds, exotic matter and the unification scale in F-SU(5) GUT