As of 2015, replacement exhaust fans are available from W.W. Grainger, Ventilation Direct and The Home Depot. These retailers offer several different types of exhaust fans from different brands.
W.W. Grainger sells both wall and ceiling replacement exhaust fans. It has fans that are appropriate for both kitchen and bathroom applications. Ventilation Direct offers commercial and industrial exhaust fans that are suitable for businesses such as restaurants, food trucks and warehouses. The Home Depot offers exhaust fans from brands such as NuTone, Hampton Bay and Panasonic. Replacement exhaust fans at The Home Depot are available in a number of sizes, mounting types and air flow capacities.