Bifurcated fans are predominantly used for the extraction of warm, dusty or sometimes corrosive air at relatively low pressures. The motor is housed outside of the airstream, shielding it from detrimental atmospheres.
Axial Fans are an industry workhorse, used for innumerable applications throughout the world. They can move relatively large volumes of air at low pressure. They also have the benefit of being easily mounted within a ducting system whilst still remaining compact.