Square Therma-Fuser (ST)
Self-contained, thermally powered VAV diffuser with built-in thermostat and round damper. The 24″×24″ ST modulates airflow to hold the selected room setpoint—supporting low-pressure, high-turndown system design without wiring or pneumatics at the diffuser.
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Description
Product Model ST 2 × 2’s Option And Accessories Info:
- Model: ST — Square Therma-Fuser diffuser
- Type: C (VAV cooling only) or HC (VAV heating & cooling / automatic changeover)
- Sizes: 6, 8, 10, or 12 in. round inlet
Options
- Remote Adjust: DA1 or DA1M for Digital Wall Adjuster; WA1M for Wireless Wall Adjuster
- R-Ring: Rx bypass relief ring (x = 6, 8, or 10 in. inlet)
- Insulation: I (attic side insulation)
- Security Hanger: H
- Sheared Housing: 595 for 600 mm grid; T1 for 23 3/16″; T2 for 22 3/4″
- Blow Patterns: STD3 (3-way), STD2 (2-way opposite), STD2C (2-way corner)
- Sensor: AS for DSMC / 3rd-party integration
Accessories
- Ceiling Frame: TFHD (hard ceiling), TF4DB (4″ drop box), TF1DB (1 7/16″ drop box), TFSP (spline), TFT1 (tegular 9/16″ T-bar), TFT2 (tegular 1″ T-bar), TFAL (air lifter / no ceiling)
Includes balancing lever (manual full-open during air balance) and dial-set minimum-flow stop.
Quick Specs
- Face Size: 24″ × 24″ (600 mm)
- Actuation: Wax motor (thermally powered)
- Setpoints: Cooling & heating thumbwheels (ST-HC); cooling only on ST-C
- Recommended Static: 0.05–0.25 in. wg (typical window)
