The Backward Centrifugal Fan caster architectonics consists of blades that camber abroad from the administration of caster travel. PTI astern ambit admirers are characterized by top efficiency, top CFM and asperous long-life architectonics for top changeless burden applications. PTI admirers are acutely efficient, acute beneath appliance than added types of fans. A arrangement of accepted models or custom designs are available. Custom admirers are accessible to whatever blueprint needed.

External rotor motors are usually independent aural the abyss of the fan impeller, appropriately extenuative the amplitude commonly active by a accepted motor. They are amid in the air stream, so temperature is limited, and are about of aegis chic IP44, so the air needs to be apple-pie and dry to abstain motor contamination.

DC Axial Fan impellers advance burden aural the envelope of the impeller and do not accordingly await on a annal apartment for this purpose. They are of about low bulk and can be artlessly and cheaply housed. Air is fatigued through a radiussed basin ring, which minimises burden losses and air leakage, and is absolved at 90° to the basin axis. The impeller has a 'non-overloading' appropriate in that it draws best ability abreast the centre of its pressure/volume breeze curve.