Ring blower Vs Roots Blower

 

In modern industries, air movement plays a critical role in processes such as conveying, suction, aeration, drying, cooling, and fume extraction. Two popular machines used for these applications are Ring Blowers (Side Channel Blowers) and Roots Blowers (Twin Lobe / Positive Displacement Blowers).

 

While both create airflow and pressure, their working principles, performance characteristics, and ideal applications differ significantly.

 

This blog explains the technical differences, including efficiency, pressure range, noise, maintenance, and operating life - and concludes with practical suggestions on when ring blowers are the better choice.

 

Ring Blower Vs Roots Blower:

 

Ring blowers and roots blowers are both types of positive displacement blowers used for moving air or gases. They have distinct designs and operating principles, each with its own advantages and applications.

 

Ring Blower:

 

Also known as side channel blowers, ring blowers use a high-speed impeller within a circular casing. As the impeller rotates, it generates centrifugal force, pushing air outward into the channels of the casing. This continuous movement creates high-pressure airflow.

 

Working Principle:

 

Ring Blower (Side Channel Blower)

 

• A ring blower works on the side-channel principle:
• The impeller rotates at a high speed.
• Air enters the side channel and is repeatedly accelerated by the impeller blades.
• The air energy increases with each circulation, creating moderate pressure and high airflow.

 

Key Characteristics

 

• Dynamic machine
• Non-contact impeller
• No lubrication needed
• Clean, oil-free air

 

Roots Blower (Twin Lobe Blower):

 

Roots blowers consist of two or three lobed rotating impellers housed within a casing. These lobes mesh without touching, trapping and pushing air between the lobes and the blower housing, creating airflow.

 

• Roots blowers operate on positive displacement:
• Two figure-8 shaped lobes rotate in opposite directions inside a casing.
• They trap air between the lobes and casing and push it toward the discharge.
• Produces high volume and higher pressure but with pulsations.
•  

Key Characteristics

 

• Positive displacement machine
• Requires lubrication
• Airflow contains pulsations
• Heavy-duty mechanical system

 

The following table is simple comparison between Ring Blower Vs Roots Blower.

 

SN	Ring Blower	Roots Blower
1	Compact In Size	Bulk in Size
2	Light Weight	Heavy Weight
3	Direct Drive with Motor	Belt Drive With Motor
4	Low Vibration	High Vibration
5	Low Noise Level	High Noise Level
6	Less maintenance	Heavy Maintenance
7	Less Spare Parts	Complicated spare parts
8	Low Price	High price
9	Easy to Transport	Difficult to transport
10	Easy to Service	Hard to service
11	Low cost for Service	High cost for Service

 

Application Suitability:

 

Where Ring Blowers Excel

 

• Light material conveying (plastic granules, paper trim, lightweight powders)
• Aeration in aquaculture & effluent treatment
• Vacuum lifting / pick-and-place
• Small STP Plants
• Air knives and drying systems
• CNC oil mist extraction
• Fume extraction and laboratory suction
• Industrial vacuum cleaning (with multi-stage models)

 

Where Roots Blowers Are Preferred

 

• Big Sewage aeration in STP/ETP
• High-pressure conveying (cement, minerals, iron ore fines)
• Backwashing in water treatment plants
• Chemical plant process pressure needs
• Furnace combustion air supply
   

Why Ring Blowers Are Gaining Popularity in Modern Industries:

Industries are shifting toward energy-efficient, low-maintenance systems. Ring blowers meet these expectations due to:

 

• Oil-free, contamination-free operation

Perfect for food, pharma, chemical, and cleanroom environments.

• Low Noise Levels

Ideal for indoor installations and OEM equipment.

• Highly Reliable Design

Non-contact impeller ensures longer life with minimal wear.

• Compact & Lightweight

Suits machine builders, automation lines, CNC machines, robotics.

• Lower Lifecycle Cost

No lubrication + minimal service = reduced downtime and costs.

 

Final Recommendation: 

 

When Should You Choose a Ring Blower?

 

If your application requires:

 

✔ Up to 700-1200 mbar pressure

✔ Oil-free air
✔ Continuous 24/7 operation
✔ Low noise
✔ Maintenance-free performance
✔ Long service life

...a Ring Blower is the BEST choice.

 

Cleantek Ring Blowers (0.5 HP to 50 HP) are engineered to deliver:

 

• High efficiency
• Stable air performance
• Vibration-free operation
• Custom-built solutions for OEMs & industries