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November 14, 2025

Kaeser

What is Kaeser FBS 720 Rotary Screw Blower and How Does It Improve Industrial Air Efficiency?

In many industrial plants the air-blowing system quietly drains a significant portion of your energy budget, often without anyone noticing – until the bill arrives. For a plant manager or maintenance engineer, this means the twin headaches of soaring operating costs and unreliable airflow. With that in mind, let’s cut to the chase: the Kaeser FBS 720 rotary screw blower is engineered to deliver two things many air-system managers crave – lower energy consumption and consistent, high-quality airflow.

This article will unpack the core capabilities of the FBS 720, show concrete performance data and outline how you can integrate it into your facility to drive measurable gains in efficiency and uptime. After reading, you’ll be equipped to engage procurement, engineering and operations with confidence around whether this unit fits your industrial air-system needs.

Core Content Delivery

1. What is the FBS 720?

The FBS series from Kaeser comprises rotary screw blowers designed for low-pressure industrial applications (e.g., wastewater aeration, fluidization, general process air).
The FBS 720 is positioned among the larger units in that series: for example, the 720 “L” model delivers ~72.5 m³/min of usable flow at a gauge pressure of ~0.7 bar.
It is offered in versions of both fixed-speed (STC) and variable-speed (SFC) with synchronous reluctance or IE4/IE5 motors (depending on region).

2. Why it improves air-system efficiency

Here are specific data points and features that drive the value:

Energy savings: Compared to conventional rotary-lobe blowers, the Kaeser rotary screw blowers in general claim up to 35 % less energy consumption.
Consistent specific package input power: The FBS 720 benefits from a geared, loss-free drive transmission and the SIGMA PROFILE rotors, which means the “kW per unit of airflow” stays near flat across a wide load range. For example, use of synchronous reluctance motors in these machines contribute up to ~10 % additional savings in partial-load operation.
Wide modulation capability: The SFC version offers a control range of about 1:4 (flow) – meaning you can match the blower output more closely to actual demand, avoiding oversizing waste.
Compact/installation-friendly design: The FBS 720 allows side-by-side installation (all service access from one side) and is delivered as a plug-and-play complete unit (motor, control, sound enclosure, etc.). That reduces installation-time cost and risk of integration errors.

3. Real-world deployment considerations

To actually harness those efficiencies, you’ll want to evaluate these factors in your plant:

Load Profile: If your blower demand varies significantly (say 30 % to 100 %), the SFC (variable-speed) version will yield higher savings. If your demand is very steady, a fixed-speed STC version may be adequate and more cost-effective upfront.
Airflow & Pressure Requirements: It’s vital to map your required flow (m³/min) and gauge pressure (bar/mbar) and compare with the FBS data. Example: FBS 720 “L” SFC listed at 72.5 m³/min at ~700 mbar (≈0.7 bar).
Integration with Control Systems: The built-in controller (SIGMA CONTROL 2) supports multiple industrial network protocols and remote monitoring. That feeds into predictive maintenance and performance tracking.
Total Cost of Ownership (TCO): When assessing, include not just capital cost but energy cost savings, maintenance reduction (e.g., fewer belts, geared transmission) and installation/commissioning time saved. The FBS claims several of these advantages.
Maintenance & Service Access: Because Kaeser designs the FBS 720 for front-service access and minimal auxiliary components, downtime risk drops – which in turn supports higher availability.

4. Comparative snapshot: FBS 720 vs older or alternative technologies

Metric	Conventional rotary-lobe blower	Kaeser FBS 720 rotary screw blower
Energy use	Baseline	Up to ~35% less energy suggested.
Flow control flexibility	Limited	Control range ~1:4 in SFC version.
Drive train losses	Belt or less efficient transmission	Loss-free gearing between motor & air-end.
Footprint & installation	Larger, may need side clearance	Compact, side‐by‐side installable.
Data/integration capabilities	Basic controls	Full controller with network interfaces, remote access.

5. Quantifiable business impact

Here’s how these features translate into real-business results:

If your blower system runs 24/7 and you reduce energy consumption by 30% compared to your legacy unit, your annual electricity cost could drop by tens of thousands of dollars (or equivalent INR for India) depending on load size and tariff.
Reduced maintenance downtime and simpler installation mean less lost production and fewer unplanned outages – which improves plant reliability and throughput.
A smaller footprint frees up space in your mechanical room or blower hall – that matters in high-density plants.

Key Takeaway:

The Kaeser FBS 720 delivers up to ~35 % energy savings compared to conventional rotary-lobe blowers, offers a modulation range of ~1:4 for variable-speed operation and is designed for plug-and-play installation with compact footprint and advanced control integration.