Radial Outlet HSC-FD

The world's highest performing fixed vane VAV swirl diffuser.

High capacity swirl diffuser with high induction, fixed horizontal discharge from swirl vanes flush with diffuser face, optionally screened by perforated cover plate. Suitable for low temperature supply air (≥ 5°C) and CAV or VAV systems with extended turndown. May be mounted flush with ceiling or free-hanging.


Mixed flow discharge: High induction swirl discharge intensely mixes supply air with room air. Strong supply air dilution with rapid discharge velocity decay produces draught-free, high momentum supply air motion with uniform temperature distribution over short or long throws. Ideal for enhanced thermal comfort (ADPI ≥ 90%).

Return air: Also suitable for use as a return air inlet.

Ceiling location: Air supply from above the space, integrated flush with a closed ceiling or freely suspended.

Low temperature supply: May be used for low temperature (cold air) supply systems (Tsupply ≥ 5°C), where ∆Tsupply-room ≥ -16 K.

VAV dependent throw: Throw dependent upon airflow rate. Minimum airflow dependent upon ∆Tsupply-room (eg turndown to 25-28%, neck reducer dependent, and down to ≈1 L/s/m2 @ ∆Tsupply-room ≈ -16 K).

Fixed direction: 360° radial pattern (4-way blow), horizontal discharge.

Square face shape:
Lay-in tile, suitable for standard ceiling grids of up to 600 mm or 24".

Radial face pattern: 20 substantially radially aligned vanes provide highly inductive swirl discharge. Vanes with helical twist extend VAV operating range. Cambered leading edges reduce pressure drop and noise.

Metal Face: Powder coated metal finish.


Smudge minimiser: CleanScreen™ air supply through optional perforated hub washes diffuser face with clean supply air, minimising diffuser face soiling due to air borne contaminants from the room. Patents pending.

Sweat inhibitor: CleanScreen™ (patents pending) air supply through optional perforated hub washes diffuser face with dehumidified supply air, eliminating diffuser face condensation due to humid room air.

Circular face shape: Face diameter ≥ 1.4 x DN. Well suited to plaster board ceilings or freely suspended applications.

Perforated face pattern: Square perforated face panel (down to 35% open area) to screen diffuser face.

Neck reducers: Reduce airflow duty.

Blanking segments: Provide 2-way or 3-way discharge patterns. May be combined with neck reducers.

Plenums: Side-entry foam connection boxes with threaded rod or magnetic edge strip fastenings.

Ceiling Diffusers
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Twist Outlet DK
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Radial Slot Outlet DEK
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Radial Slot Outlet (Circular) DEK
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Radial Outlet DK-O
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Radial Outlet HSC-FD
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Adjustable Radial Outlet HSC-AD
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Slot Diffuser SR
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Invisible Diffuser
Floor Diffusers
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Floor Twist outlet MFD-TP
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Floor Displacement outlet MFD-DP
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Auditorium Floor Swirl Diffuser ASF-AD
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Inclined Floor Swirl Diffuser ISF-AD
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Auditorium Step Swirl Diffuser CSS-FD
Sidewall Diffusers
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Linear Whirl Outlet LSW
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Jet Nozzle SAP
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Jet nozzle SAP
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Broad multiplex outlet PMW
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Wall Swirl Diffuser CSW
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Linear Multistream Wall Diffuser LMW
Displacement Outlets (Commercial)
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Rectangular displacement outlet DF1W
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Circular displacement outlet DR360
Displacement Outlets (Industrial)
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Circular displacement outlet CP
Assembly Rooms
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