Industrial cooling fan applications are very common, the application environment is not the same, in the environment of the more adverse conditions, such as outdoor, wet, dusty, etc. Central general cooling fan have to add waterproof level, that is, IPxx, the so-called IP is the abbreviation of Ingress Protection, IP level is for the enclosure of the electrical equipment on the intrusion of foreign objects protection level, dustproof, waterproof and anti-collision. The IP rating is an abbreviation for Ingress Protection.

The IP rating is often expressed as IP followed by two numbers, which are used to understand the level of protection:

The first number identifies the extent to which the equipment is resistant to fine dust, with I representing the level of protection against the ingress of solid foreign bodies, with the highest level being 6;
The second number indicates the level of waterproofing, P on behalf of the level of water to avoid entry, the highest level is 8.

Such as cooling fan protection level IP54, cooling fan IP54 is the most basic waterproof level referred to as three-proof paint, the process is the PCB board is immersed in the whole, usually the highest waterproof cooling fan can do is IP68, is to abort the vacuum coating or gluing complete isolation from the outside world.