Oil rich environments can be commonly found in many industrial or machining applications. Standard fans often have difficulties operating in these environments due to the harsh conditions caused by the oils. To help alleviate concerns of fan operation in these environments Sanyo Denki offers a line of oil resistant fans. These fans use similar protection to the splash proof fans but with added protections. To prevent damage to the electronic components, the internals are fully epoxy coated. Oil degradation of the plastics is common with standard fans and may cause the frame and impeller to soften or break. The Sanyo Denki Oil proof fans are built using specific plastics with low reactivity with many oils including harsh cooking oils. Finally, oil proof fans are designed with an increased air gap between the impeller and frame. This gap helps prevent oil build up on the frame which could lock the impeller in place over time.