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4) put up fan, connect, test $75-100. So-total About $250-425 with no box there now, plus cost of fixture. A simple install to replace an existing fan, or install where the ceiling box was wired for a fan, would be only about $75-100.) put up fan, connect, test $75-100. So-total About $250-425 with no box there now, plus cost of fixture. A simple install to replace an existing fan, or install where the ceiling box was wired for a fan, would be only about $75-100.
The size of fan needed to effectively vent your attic is typically determined by the size of the area it will service. Installing a fan to accommodate a small building up to 1000 square feet costs an average of $287. The same project in moderately sized locations costs $344 for a 1000-1500 sq. ft., $428 for 1500-2000 sq. ft., and $507 for 2000-2500 sq. ft. Since larger buildings require even more substantial fans, installation prices average $679 for 2500-3000 sq. ft. sites and $814 for buildings of more than 3000 sq. ft.