It's heating up out there! A Portable Personal Worksite Fan provides airflow, ventilation, and cooling for workers. It runs off a rechargeable battery (or cord as back-up option) and is reportedly powerful enough to cool the air up to 40 feet. Depending on make/model and fan speed setting, run time can reportedly vary from 5 to 15 hours on a single charge. Some provide forward-only air flow, others allow 120-, 160-, even 360-degree oscillating and up to nine stopped positions.