1. Twin-Lobe Roots Blower

• Design: Two lobed rotors (figure-eight shape) that mesh without contact. 

• Operation: These rotors rotate in opposite directions, synchronized by timing gears. 

• Characteristics: Reliable, rugged, ideal for oil-free air delivery. Akash Blowers, for example, manufactures high-performance twin lobe roots blowers with precision timing gears and anti-friction bearings. 

• Use Cases: Aeration in wastewater treatment, pneumatic conveying, vacuum boosting, silo aeration, etc.

2. Tri-Lobe Roots Blower

• Design: Three-lobed rotor per side, often with a twisted geometry. 

• Benefits: More continuous, smoother airflow; lower pulsation and noise compared to twin-lobe designs.

• Applications: When smooth flow is critical (e.g., in sensitive gas processes, low-noise systems, or when pulsation reduction is required).

3. Water-Cooled Roots Blower

• Cooling Method: Incorporates water jackets or passages to dissipate heat.

• Advantage: Better thermal management — useful under high-load or high-temperature conditions.

• Ideal For: Processes in which compressor temperature must be controlled, or where ambient heat is high.

4. Air-Cooled Roots Blower

• Cooling Method: Uses air to cool the unit, typically simpler and more compact.

• Use Cases: Standard industrial applications where heat load isn’t excessive, and simpler maintenance is desirable.

5. Roots Blower Centrifugal-Hybrid

• Concept: In some advanced systems, a Roots blower may be coupled with a centrifugal stage — though this is more specialized.

• Goal: Combine the high volume, low-pressure benefits of a roots blower with the higher-pressure capabilities of a centrifugal compressor.

• Application: Very specific cases where both volume and pressure are critical.

6. Gas / Industrial Roots Blower

• Design Variation: Built to handle gas types beyond just air; may include special materials, seals, or coatings.

• Applications: Chemical processing, flue gas systems, gas boosting, industrial gas transport, inert gas conveying.