MPT-7210A 80mm to 40mm Fan Adapter
thingiverse
This adapter enables the mounting of an 80mm computer fan on the MPT-7210A solar charge controller's 40mm fan holes. Although airflow is limited due to the shallow design, its performance likely equals that of the original 40mm fan. The Delta AUB0812L, a widely available standard 80mm computer fan, was used for this purpose: https://www.digikey.com/product-detail/en/delta-electronics/AUB0812L-9X41/603-1224-ND/2234246
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