--- title: What is the rated air movement in CFM (cubic feet of airflow per minute) for a solar powered fan? description: Since the fan is solar powered the CFM varies depending on the amount of direct sunlight available. --- [Skip to content](https://help.gibraltarbuildingproducts.com/en/knowledge/hello-us-sunlight.-what-is-the-rated-air-movement-in-cfm-for-each-wattage-offering-within-your-family-of-solar-powered-fans#main-content) English Show submenu for translations ![GBAD Full Color.png](https://blog.stealthbond.com/hubfs/GBAD%20Full%20Color.png) Open main navigation Close main navigation - English Show submenu for translations - Go to www.gibraltarbuildingproducts.com Go to www.gibraltarbuildingproducts.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://help.gibraltarbuildingproducts.com/en/knowledge?hsLang=en) 2. [Ventilation](https://help.gibraltarbuildingproducts.com/en/knowledge/ventilation?hsLang=en) 3. [Power Fans](https://help.gibraltarbuildingproducts.com/en/knowledge/ventilation?hsLang=en#power-fans) # 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). 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