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Defender Plus Rotary Lobe

Defender Plus™ Rotary Lobe Blower Package Capacity up to 3,400 cfm 

Smarter controls. Proven reliability. Designed for municipal & industrial wastewater applications. 

The HOFFMAN Defender Plus™ Rotary Lobe Blower Package represents the next generation of the Defender family - engineered to convey air and neutral gases at low pressures with confidence in demanding wastewater environments. Defender Plus combines a proven positive displacement tri‑lobe blower with modern integrated controls, a compact package layout, and noise‑reducing design features that support a quieter installation.  
Designed for process stability and long service life, Defender Plus helps plants adapt output to changing demand with fixed or variable speed options and a control platform that makes it easier to monitor performance, protect equipment, and respond faster.  
With capabilities up to 15 psig, 15 inHg vacuum, and 3,400 cfm, Defender Plus is sized for real municipal airflow requirements - without sacrificing the rugged mechanical design operators rely on. 

 

Pressure: up to 15 psig 

Vacuum: up to 15 inHg 

Airflow: up to 3,400 cfm 

Controls: Integrated Governor Controller + iConn™ connectivity  

Rotary Lobe DEFENDER Plus Packages – The DEFENDER Plus Series 

Proven Tri‑Lobe Reliability - Now with Integrated Controls 

 

Defender Plus™ is a fully integrated rotary lobe blower package that combines the proven Defender tri‑lobe platform with a modern control system, updated package assembly, and a footprint designed for real wastewater blower rooms. Built to convey air and gas at low pressures, Defender Plus supports continuous duty service, stable airflow delivery, and dependable operation across variable process conditions. 

 

Core Package Features 

  • Positive displacement rotary lobe blower with trilobe rotors
  • Integrated blower package: blower, motor, belt drive, controls, silencers, and enclosure, factory assembled as a complete system
  • Frame options: available in Frame 3 and Frame 4 sizing
  • Singlepiece cast iron cylinder for strength and heat dissipation 
  • Helical timing gears for smooth, quiet operation 
  • Highstrength shafts + longlife bearings rated for severe duty
  • Dual splash lubrication on drive and gear ends 
  • Fully boxed steel base for rigidity and transport 
  • Enclosure with insulated panels designed for quieter performance 
  • Optimized discharge silencer 
  • Tunable inlet filter/silencer 
  • Reduced pulsation design to lessen downstream wear  

Smart Controls (Integrated) 

  • Fullcolor touchscreen Governor Controller with real‑time operating data and diagnostics 
  • Builtin alarms, diagnostics, and equipment safeguards to reduce unplanned downtime 
  • iConn™ remote connectivity for monitoring, notifications, data logging, and SCADA integration
  • Fixed or variable speed options for application flexibility

Maintenance-Friendly Design 

  • All routine maintenance accessed from the front 
  • External oil level checks (running or stopped) 
  • Easy oil changes via accessible fill and drain hoses 
  • Automatic belt tensioning system 
  • Simple belt replacement without special tools 

 

Built for Municipal Wastewater Reality 

  • Reliable, continuousduty airflow that supports biological process stability 
  • Wide turndown capability for changing process demand 
  • Reduced noise levels for plant environments 
  • Lower maintenance time with front-access serviceability 

 

Smarter Operation = More Confidence 

  • Faster troubleshooting with on-screen diagnostics and alarms 
  • Better protection against critical events with automatic shutdown safeguards 
  • Improved visibility for operators and maintenance teams with remote insight (iConn™)

 

defender plus rotary lobe specification
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