SDL Single-Duct Low-Height VAV Terminal Units

Small but mighty

Single-duct VAV terminals improve space comfort and flexibility for a wide variety of HVAC applications. Operations create very little noise while still delivering air to the entire operating range.

  • SDL can be applied for a variety of single-duct application requirements
  • AHRI 880 and ETL-certified and labeled to meet industry performance and safety standards
  • Piping packages with 2-way on/off, modulating, or proportional control valves, and fixed or adjustable PICV flow control devices
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Product Overview

Our single-duct low height VAV terminals are designed for precise air delivery, compatible with a variety of HVAC systems, and operate very quietly. SDL is a low-height version of a regular single-duct VAV terminal (SDR). The SDL is perfect for the congested ceilings often found in hospitals or schools.
Product Overview



ENVIRO-TEC VAV units maximize building air quality, comfort, and airflow with improved spacing and design flexibility.


Manage air volume efficiently with a VAV terminal unit that offers a range of configurations and heating control options.


Our VAV terminals deliver long-lasting performance through quiet, precise airflow to the occupied space.

Genuine Performance
Genuine Performance

ENVIRO-TEC VAV terminals offer genuine performance advantages through unique configurations, control options, and industry-leading sound data.


  • CFM: 300 to 4,100 CFM
  • Low height units can be applied for a variety of single duct application requirements and are perfect for retrofit projects, schools, labs & hospitals, anywhere with congested ceiling spaces.
  • Robust inlet collar for ease in mounting and installation
  • OSHP-OSP-certified in compliance with CBC and IBC to ensure cabinet integrity throughout the installation process and seismic events.
  • Superior FlowStar air measuring probe provides for lower minimum cubic feet per minute (CFM) values, which reduces energy costs and noise while maintaining comfort in the zone.
  • Low height SDL units max height at 10 inches.
  • Available as an integrated VAV box with direct digital controls that allows for a bundled offering with lower total installation costs.
  • 18 month Limited Warranty

Technical Resources

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