Round Therma-Fuser

With its architecturally pleasing shape, round Therma-Fuser™ diffusers provide the same benefits as square Therma-Fuser diffusers but with a shape to blend in with round architectural features or exposed round duct work. The round flat lip and the round flat appearance panel provide an unobtrusive thermally powered diffuser when used with an exposed duct work ceiling. Addition of the optional air lifter (anti-smudge) ring makes a bigger architectural statement and lofts the air for less drop. Round Therma-Fuser diffusers are a nominal 24in diameter and fit between the tee bars of standard lay-in ceilings.
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Product Description

Use the following model number nomenclature to order Therma-Fuser diffusers, options and accessories.


  • Model: STR – Round Therma-Fuser diffuser
  • Type: C VAV cooling only or HC VAV heating and cooling
  • Size: 6, 8, 10, or 12 inch inlet


  • Remote Adjust: SDA1 or SDA1M for Digital Wall Adjuster
  • Security Hanger: H
  • 595mm Metric: 595 (dia. round) for metric grid ceilings
  • Silk Screen: S for appearance panel pattern
  • Sensor: SMCS for SMC or SENSOR for 3rd party


  • Air Lifter: AC-STRAL Air Lifter or Anti-smudge ring
  • Square Frame: AC-STRS Round to square lay-in frame for 2’x2′ ceiling grid

Specification Sheet