Roots Blower – Types & Works of Roots Blower Roots Blower Rotary positive blower is also known as positive displacement Roots blower (PD Roots blower). The mechanism of blower is unique and much traditional use from years of time. The roots blower design was first time patented in 1860 by Philander Higley and Francis Marian Roots. Based on the name of the scientist, the blower is recognized as roots blower. How Roots Blower WorksThe executing mechanism of blower is intake the air from inlet and dual impellers rotating in different directions trap the air during the rotation between the casing and impeller and discharge at the outlet. The equipment throws the consistent volume of gas to the outlet without discharge thus roots blower is unique compare to compressor. The gas blowing capacity of roots blower depend on the size of casing and rotating part. The air pressure of thrown gas is constant without any change. There is the feature that can operate the blower at high pressure