The CFFA-400 is a fan filter assembly designed for integration with 40 mm cooling fans. It features a 45.5 x 45.5 mm housing constructed from PA-707 (UL94HB) black plastic with a 32.5 mm mounting pitch, providing standardized installation compatibility. The filter media consists of polyurethane foam with 30 PPI (pores per inch) density, offering effective air filtration while maintaining adequate airflow. The mechanical design includes precision-molded upper and lower housings with mounting holes (ø8 and ø4.1 mm) and a tolerance of ±1.0 mm, ensuring reliable fit and performance. This fan filter is commonly used in computer cooling systems, industrial equipment, and HVAC applications where dust prevention and component protection are essential.