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Fans with ambient air cooling systems handling hot airstreams must have sufficient airflow and be kept in operation until airstream temperatures cool below 120 F to prevent damage to the fan unit. The Tubeaxial fan ambient air cooling system is only effective while fan is operating. Many of the apparent health symptoms are vague and common to both the office and home environment. Guidelines or standards for permissible personal exposure limits to pollutants within office buildings are very limited.