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Motivated by recent experiments measuring the thermal Hall conductivity of α-RuCl₃ and using spin-wave theory and model effective Hamiltonians from the literature, the magnon Thermal Hall coefficient in the magnetically ordered phase is computed. Comparing directly with the experiment, no previously proposed model well matches the data. A model is determined which can explain the data demonstrating that the magnon Berry curvature could be responsible. The discrepancy could also be explained by phonons but not by Kitaev-like excitations.