Square Therma-Fuser (TF)

The Acutherm TF is a 24″ square, thermally powered variable-air-volume diffuser with integrated thermostatic control. It automatically regulates airflow to maintain room temperature setpoints, providing quiet, energy-efficient comfort control for each zone — without electrical or pneumatic connections.
Description
Product Model TF 24″ Square Options and Accessories Info:
- Model: TF — Square Therma-Fuser diffuser
- Types: TF-HC, TF-HC-LH, TF-CW, TF-C, TF-HC-NH, TF-D, TF-RA
- Inlet Sizes: 6″, 8″, 10″, and 12″ round
Features
- Thermally powered actuator — no wiring or pneumatics required.
- Separate heating and cooling thermostats with individual adjustable setpoints.
- Changeover thermostat automatically switches between heating and cooling.
- Micrometer-type temperature setpoint dials accessible under hinged appearance panel.
- Provides proportional airflow control maintaining temperature within ±1.5°F of setpoint.
- Ten-year manufacturer warranty.
Options
- Remote Adjust: DA1 or DA1M Digital Wall Adjuster
- Relief Ring: R6, R8, or R10 for pressure bypass
- Insulation: I for attic-side insulation
- Security Hanger: H
- Minimum Flow Stops: FR (rubber type) or FS (screw type)
- Sheared Housing: 595 mm option for metric ceiling grids
- Blow Patterns: TFD3 (3-way), TFD2 (2-way), TFD2C (corner), or TFD1 (1-way)
- Silk Screen: S patterned face
- Sensor: SMCS or SENSOR for third-party integration
Accessories
- Ceiling Frames: TFHD (hard ceiling), TFSP (spline), TFT1/TFT2 (T-bar), TFAL (air lifter/open ceiling)
TF diffusers include a manual balancing lever for field setup, adjustable minimum airflow stops, and accessible calibration through the appearance panel for maintenance-free operation.
Quick Specs
| Face Size | 24″ (600 mm) square |
| Inlet Sizes | 6″, 8″, 10″, 12″ |
| Setpoint Range | 70–78 °F (factory 74 °F) |
| Changeover | 76–80 °F heating; 68–72 °F cooling return |
| Static Pressure | 0.05–0.25 in. wg |
| Material | Steel, powder-coated |
| Warranty | 10 Years |
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