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If you have a normally shaped roof, and the slope of your roof is not extremely steep or extremely shallow, then you need at least 1.6 CFM (cubic feet per minute flow rate) for each square foot of roof space. If your house roof is very unusual or very steep or shallow, then you can calculate your requirements. You simply multiply the square footage of your house roof by the average height of your attic space, and then divide by 10. This is the minimum CFM required to ventilate your attic.