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A roof fan that looks right on paper can still miss the job by a wide margin once it sees real heat, duct loss, filters, louvers, and building pressure. That is why roof mount exhaust fan sizing should never start with fan diameter alone or a rough air changes per hour guess. The right approach starts with what the building needs to remove - heat, fumes, moisture, smoke, process air, or general stale air - and then works backward to the actual CFM and static pressure the fan must handle. …