Belimo LM24A-SR Linear Actuator
Belimo LM24A-SR is positioned as the best-in-class choice for linear damper and vent actuators because it combines compact design, reliable spring-return fail-safe functionality, and precise modulation that suit critical HVAC dampers. Compared with the other products listed, it offers a strong balance of speed, built-in protection and proven field reliability that can reduce lifecycle maintenance costs despite a typically higher purchase price.
Swiss-watch precision
Whisper-quiet
Swiss-watch precision
Whisper-quiet
Review Summary
"Installers and building engineers praise the Belimo LM24A-SR for quiet operation, precise positioning and long-term reliability; a few note the higher upfront cost but consider it worth the performance."
Compact powerhouse
24 V operation with built-in spring-return for reliable fail-safe damper return
Compact powerhouse
24 V operation with built-in spring-return for reliable fail-safe damper return
Increased Safety & Security
Time-Saving Convenience
Belimo LM24A-SR is positioned as the best-in-class choice for linear damper and vent actuators because it combines compact design, reliable spring-return fail-safe functionality, and precise modulation that suit critical HVAC dampers. Compared with the other products listed, it offers a strong balance of speed, built-in protection and proven field reliability that can reduce lifecycle maintenance costs despite a typically higher purchase price.
Swiss-watch precision
Whisper-quiet
Compact powerhouse
24 V operation with built-in spring-return for reliable fail-safe damper return
Compact, low-power design commonly used for damper and vent control in HVAC
Swiss-watch precision
Whisper-quiet
Compact powerhouse
24 V operation with built-in spring-return for reliable fail-safe damper return
Compact, low-power design commonly used for damper and vent control in HVAC
$250-400 USD
Honeywell ML6984A4000 Linear Valve Actuator
The Honeywell ML6984A4000 stands out as a market leader for cost-conscious projects and legacy system retrofits, offering dependable linear valve actuation with broad compatibility across older HVAC controls. While it may lack some of the advanced diagnostics or native BMS integration of higher-end makers, its lower upfront cost and wide availability make it an attractive financial choice for large-scale replacements or budget-limited installations.
Rugged reliability
Rapid actuation
Rugged reliability
Rapid actuation
Review Summary
"The Honeywell ML6984A4000 is generally regarded as a reliable linear valve actuator with broad compatibility; some users report occasional calibration challenges and moderate operating noise."
Retrofit-friendly
Designed for linear valve actuation with robust mechanical drive for precise valve positioning
Retrofit-friendly
Designed for linear valve actuation with robust mechanical drive for precise valve positioning
Increased Safety & Security
Time-Saving Convenience
Skill Development & Mastery
The Honeywell ML6984A4000 stands out as a market leader for cost-conscious projects and legacy system retrofits, offering dependable linear valve actuation with broad compatibility across older HVAC controls. While it may lack some of the advanced diagnostics or native BMS integration of higher-end makers, its lower upfront cost and wide availability make it an attractive financial choice for large-scale replacements or budget-limited installations.
Rugged reliability
Rapid actuation
Retrofit-friendly
Designed for linear valve actuation with robust mechanical drive for precise valve positioning
Suitable for commercial HVAC valve applications with durable metal housing
Rugged reliability
Rapid actuation
Retrofit-friendly
Designed for linear valve actuation with robust mechanical drive for precise valve positioning
Suitable for commercial HVAC valve applications with durable metal housing
$300-500 USD
Johnson Controls M9220-AGA-2 Electric Linear Actuator
Johnson Controls M9220-AGA-2 excels where deep building management integration and long-term service are priorities, delivering robust actuation and seamless interoperability with Johnson Controls systems like Metasys. Compared to others here, its key advantage is reduced integration engineering cost and strong aftermarket support, making it financially efficient for facilities already standardized on the Johnson Controls ecosystem.
Industry-standard fit
Robust construction
Industry-standard fit
Robust construction
Review Summary
"Users find the Johnson Controls M9220-AGA-2 solidly built and consistent in operation, although a minority mention its bulkier size and occasional sluggish response under heavy loads."
Smooth modulation
Built for heavy-duty, long-life operation in commercial damper and vent systems
Smooth modulation
Built for heavy-duty, long-life operation in commercial damper and vent systems
Increased Safety & Security
Time-Saving Convenience
Johnson Controls M9220-AGA-2 excels where deep building management integration and long-term service are priorities, delivering robust actuation and seamless interoperability with Johnson Controls systems like Metasys. Compared to others here, its key advantage is reduced integration engineering cost and strong aftermarket support, making it financially efficient for facilities already standardized on the Johnson Controls ecosystem.
Industry-standard fit
Robust construction
Smooth modulation
Built for heavy-duty, long-life operation in commercial damper and vent systems
Offers reliable linear motion and adjustable end stops for accurate travel limits
Industry-standard fit
Robust construction
Smooth modulation
Built for heavy-duty, long-life operation in commercial damper and vent systems
Offers reliable linear motion and adjustable end stops for accurate travel limits
$220-360 USD
Siemens SQM45 Linear Actuator
The Siemens SQM45 is a premium linear actuator valued for precise control, extensive diagnostics and a wide European service network, which improves uptime and reduces diagnostic labor compared with simpler units. Its technical strengths — particularly in monitoring and energy-optimized operation — are ideal for projects prioritizing operational efficiency and predictive maintenance, though initial hardware cost may be higher than basic competitors.
High torque punch
Extended lifecycle
High torque punch
Extended lifecycle
Review Summary
"The Siemens SQM45 is widely respected for durability, precise control and straightforward integration with building automation; a few technicians note occasional need for end-stop adjustments."
Smart-ready
Industry-standard actuator designed for easy integration with Siemens and third-party BAS
Smart-ready
Industry-standard actuator designed for easy integration with Siemens and third-party BAS
Increased Safety & Security
Skill Development & Mastery
Time-Saving Convenience
The Siemens SQM45 is a premium linear actuator valued for precise control, extensive diagnostics and a wide European service network, which improves uptime and reduces diagnostic labor compared with simpler units. Its technical strengths — particularly in monitoring and energy-optimized operation — are ideal for projects prioritizing operational efficiency and predictive maintenance, though initial hardware cost may be higher than basic competitors.
High torque punch
Extended lifecycle
Smart-ready
Industry-standard actuator designed for easy integration with Siemens and third-party BAS
Reliable linear movement for dampers and vents with proven service life in building systems
High torque punch
Extended lifecycle
Smart-ready
Industry-standard actuator designed for easy integration with Siemens and third-party BAS
Reliable linear movement for dampers and vents with proven service life in building systems
$180-300 USD
Neptronic EL050 Electric Linear Actuator
Neptronic EL050 provides a strong value proposition for OEMs and retrofit jobs by offering configurable, compact electric linear actuation at a competitive price point. Against the other models, it is often the most flexible financially and technically for custom projects because of its modular options and attractive unit pricing, making it a sensible choice where budget and customization matter most.
Budget-friendly
Ultra-silent start
Budget-friendly
Ultra-silent start
Review Summary
"The Neptronic EL050 is seen as a good value with easy mounting and acceptable precision for many HVAC applications, but some customers report shorter service life under heavy cycling and mixed support experiences."
Tool-less mounting
Compact electric linear actuator offering precise positioning for small dampers and vents
Tool-less mounting
Compact electric linear actuator offering precise positioning for small dampers and vents
Time-Saving Convenience
Increased Safety & Security
Neptronic EL050 provides a strong value proposition for OEMs and retrofit jobs by offering configurable, compact electric linear actuation at a competitive price point. Against the other models, it is often the most flexible financially and technically for custom projects because of its modular options and attractive unit pricing, making it a sensible choice where budget and customization matter most.
Budget-friendly
Ultra-silent start
Tool-less mounting
Compact electric linear actuator offering precise positioning for small dampers and vents
Quiet operation with good control resolution suitable for sensitive HVAC zones
Budget-friendly
Ultra-silent start
Tool-less mounting
Compact electric linear actuator offering precise positioning for small dampers and vents
Quiet operation with good control resolution suitable for sensitive HVAC zones
$160-320 USD