Fractal Design " Silent Series" is a full range of silent case fans. The fans has been specifically developed to deliver sufficient airflow & still keep a low noise level. Available in sizes from 40mm up to 140mm. Each fan is supplied with rubber fan mounts & four fan screws. Features Multi-purpose cooling fan Supplied with rubber fan mounts 12.0 d B (A) / 1200 RPM / 24.1 CFM Great value for money