Sunon super silence brushless dc axial fans sunon ha40201v4 0000 999 brushless axial dc fan 40 x 40 x 20mm from the sunon super silence fan series this fan uses mini motor technology to maximise the space between the fan blades and the airflow passage so can run at a low speed without losing cooling efficiency ideal for use in medical equipment household electrical appliances kitchen facilities and other business equipment sunon ha40201v4 0000 999 brushless 12v dc axial fan 40 x 40