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The fan bolt holes on the mounting brackets were 1/4-inch in diameter. These could’ve been opened up using a 1/8-inch drill bit followed by a 1/4-inch drill bit. However, since we had a Whitney sheetmetal punch at our disposal, we opted to use it for the cleaner, burr-free hole it provided.
Electric Fan Install - Cool Your Engine

 The fan bolt holes on the mounting brackets were 1/4-inch in diameter. These could’ve been opened up using a 1/8-inch drill bit followed by a 1/4-inch drill bit. However, since we had a Whitney sheetmetal punch at our disposal, we opted to use it for the cleaner, burr-free hole it provided.  View Related Article

 

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