Ingersoll rand high efficiency oil removal filter, 42 cfm the new ingersoll rand filter provides the ideal platform for an easier, more reliable and fully predictable maintenance schedule. By using a unique time-based approach, the eri provides an easily visible indication to replace the filter element at the optimal time (bi-annually) to avoid high pressure drop and minimize energy consumption. In addition, the unique fit between the element and the filter body allows for a no-touch, no-hassle change out process that is quick and clean for you and your colleagues.