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Therma-Fuser Thermal VAV Diffuser

acutherm logoThe pioneering technology of Therma-Fuser™ thermal VAV Diffuser provides individual zone comfort in both heating and cooling applications.

Therma-Fusers™ are ceiling air diffusers operating as an integrated Variable Air Volume (VAV), zone of temperature control providing superior air distribution and maximising energy savings without compromising human comfort.

What is a Therma-Fuser™ VAV Diffuser?sthc vav diffuser

Each Therma-Fuser™ air diffuser is an independent zone of VAV control including thermostat, modulating damper and diffuser in a single package.

Unlike conventional building controls, Therma-Fuser™ air diffusers have no complicated electronics or pneumatics, and as a result require no maintenance.

How Do Therma-Fuser™ VAV Diffusers Work?

Therma-Fuser™ VAV (Variable Air Volume) diffusion dampers open and close to regulate air flow into the room in response to room temperature. The dampers are mechanically actuated by thermal element thermostats.

linear vav diffuserEach thermal element thermostat is a small brass cylinder containing petroleum-based wax. The wax expands when heated, driving a piston out. A spring retracts the piston when the wax cools and retracts. The movement of the piston either opens or closes the air dampers in a proportional manner.

Average room temperature is monitored by inducing a sample of air from the center of the room across the thermal element thermostats.

Because this air sample is drawn directly from the air circulation pattern in the room, just before it mixes with air flowing into the room, it better represents average room temperature than air at a wall thermostat.

With Therma-Fuser™ air grilles, room temperature throughout the room can be held within 1° C of the temperature selected. Temperature of the room is selected between 21° and 26° C by adjusting the thermal element thermostat.

Therma-Fuser™ VAV Diffuser Product Range:

The Therma-Fuser™ Range: No matter what your Facility or Design requirements may be, there is an Acutherm Therma-Fuser™ ideally matched to meet your needs. All Therma-Fuser™ models come in a range of control options including: Cooling only, Cooling & Heating & Cooling & Warmup. Round Air Diffusers also available.

Square VAV Diffusers:

• ST Series, disc type, 595 x 595mm
• TF Series, 4 blade type, 595 x 595mm
• TN Series, disc type, 320 x 320mm
• TK Series, 4 blade type, 320 x 320mm


• ADJ-D – Remote temperature setpoint & BAS interface
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Related Downloads:
• Therma-Fuser VAV Diffuser Product Range Brochure
• Square Therma-Fuser Disc-Type VAV Diffuser Brochure
• Square Therma-Fuser Blade-Type VAV Diffuser Brochure
• Therma-Fuser Digital and Wireless Wall Adjuster Brochure