San Ace 136RF Reversible Flow Fan Sanyo Denki San Ace 136RF Reversible Flow Fan is a 136x28mm bi-directional fan with approximately equal airflow and static pressure in both directions. This flexibility reduces equipment costs and conserves space by reducing the amount of fans necessary to ventilate applications such as houses, beverage vending machines, food display cases, and printers. Rotational speed is manipulated using an external PWM signal. This decreases noise and saves energy.Learn More