Electric motor IP (ingress protection) classification is a measure of the capacity of the motor to resist ingress of dust and of water. Objects, dust, or water may enter the motor providing they cannot have any detrimental effect upon its operation.
Two numbers follow the letters IP. The first number defines resistance to dust and the second to water.
The following examples are fairly typical classifications of motors used to drive general-purpose fans. The descriptions are abbreviated.
|Protection Class||Object Protection||Water Protection||Fans within Axair Range|
|IP20||Solid objects over 12.5mm||Non-protected|
|IP23 / IP24||Solid objects over 12.5mm||IPx3 : Spray at angle up to 60° Vertical|
|IPx4 : Splashed water|
|IP44||Solid objects over 1mm||Splashed water|
|IP54||Dust Resistant||Splashed water|
|IP55||Dust Resistant||Hosed water|
|IP55||Dust Resistant||Rain water|
|IP65||Dust exclusion||Hosed water|
|IP68||Dust exclusion||Water tight|
IP55 in particular is a very misunderstood category because it is often sold as being ‘as good as weather-protected’. Unfortunately no motor manufacturer will accept a warranty claim for damage to an IP55 motor that has been installed outdoors without a ventilated rain cover. The reason is that rain water, or melting snow and ice, has time to penetrate unsealed gaps and assembly spigots, whereas hosed water is only applied for a short wash-down period and the motor dries quickly.
|Examples of weather-protected fans|
|Corrosion resistant centrifugal fan with weather pedestal||Fan filter kit type FPF with stainless steel cover||Roof fans|
IP55 does not necessarily imply sealing of the motor external surface, it can mean sealing the bearings, and totally protecting motor windings and all connections with resin, a plastic cover, or both. Water is then permitted to enter the motor but can do no harm.
|Examples of motor protection through encapsulation|
|External rotor motor winding without protection (For IP44 protection once complete with rotor)||External rotor motor winding encapsulated with resin for full IP55 protection|
External rotor motors, although only of IP44 or 54 splashed water protection class, do have the facility for draining any water that may enter the motor through the annular gap between the rotor and the motor backplate, or through a hole at the opposite end of the rotor. This is only recommended for types of external rotor motor that have had their internal surfaces corrosion protected.
IP68 means that not only can it guarantee 100% dust proof but is also 100% waterproof providing the maximum possible protection. In addition to this, our innovative compact fan is also ATEX approved. This means that the fan is spark proof meaning it is ideal for applications such as commercial refrigeration where due to the explosiveness of some refrigerants a spark could prove potentially dangerous and harmful. Other applications for the ATEX EC IP68 compact axial fan include serve cabinets and other enclosing cooling.