What is the rated air movement in CFM (cubic feet of airflow per minute) for a solar powered fan?

Since the fan is solar powered the CFM varies depending on the amount of direct sunlight available.

Since the fan is solar powered the power (and the CFM) varies depending on the amount of direct sunlight available. It is better to speak about the ventilation capabilities in terms of attic square footage the fan can service and also factor in the roof pitch. Please note, however, anyone can calculate the estimated CFM of a power fan using the industry-accepted formula from the Home Ventilation Institute (see www.hvi.org). The formula is: attic square footage the fan can service x 0.7 = CFM.