Varitherm® Series

Product Information

View Performance Data Varitherm®

VAV Cooling


VAV Cooling and VAV Heating


Varitherm® diffusers feature an architecturally appealing solid plaque design and high performance control linkage. The plaque can be opened to allow for easy access to temperature set-point dials, and minimum air flow adjustment.

Thermal actuators sense room air and adjust air flow into the space to satisfy the room load, requiring no wires for simple installation and maintenance.

Standard Construction Features
  • Steel backpan, faceplate and linkage for strength and durability.
  • Thermal elements for consistent, repeatable performance.
  • Hinged faceplate, with powerful magnetic closure ensures simple yet strong closure that allows for quick access to adjustment features.
  • Specially engineered damper stack for reduced linkage binding and superior performance over the entire operating range.
Standard Linkage
and Control Features
  • Individual heating and cooling set-points (Varitherm-HC only).
  • Minimum air flow adjustment.
  • Balancing mode for easy setup.
  • Automatic heating /cooling changeover (Varitherm-HC only).
  • Engineered damper lift track for a more predictable linear performance and for isolating the force of the damper on the linkage for freer, smoother operation – improving the response of the diffuser to fluctuating room loads.



White Powder Coat



For optional and special finishes
see color matrix.

    Product Selection Checklist

  1. Select Inlet Diameter based on desired performance characteristics.
  2. Select Diffuser Type by model number.
  3. Select Frame Style according to installation requirements.
  4. Select Options.
  5. Select Finish (B12 is standard).
  Example: 8" / VPD-HC / 3 / B12

  • PRC – Pressure Relief Collar regulates static pressure at the Varitherm®.
  • PCV – Pressure Control Valve.

Retrofit to SPD/SCD

The standard Varitherm® packages can be used as a retrofit to a SPD/SCD. The core of the existing SCD/SPD can be removed and the core of the selected Varitherm® model can be installed into the back pan without removal from the ceiling.

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