VD

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.

Exact values for all parameters can be determined with our Easy Product Finder design programme.

VD-H, sound power level and total differential pressure

VD-V, sound power level and total differential pressure

Ceiling swirl diffusers with square diffuser face for high rooms in comfort and industrial zones. For supply air only. Blades in diagonally opposed sections can be adjusted for air discharge from horizontal (0°) to vertical (90°). Horizontal air discharge with high induction. For freely suspended installation or for suspended ceilings of all types.

Ready-to-install component which consists of the diffuser face with four equal blade arrays, a cross bar for fixing the actuator, a plenum box with side entry or top entry spigot, and suspension holes.

The diffuser face is fixed to the plenum box with a screw.

Spigot suitable for ducts to EN 1506 or EN 13180.

Sound power level of the air-regenerated noise measured according to EN ISO 5135.

Special characteristics

• With adjustable air control blades for high rooms
• The air pattern can be adjusted manually or with an actuator
• Horizontal or vertical duct connection

Materials and surfaces

• Diffuser face made of extruded aluminium sections
• Plenum box, cross bar and extended border made of galvanised sheet steel
• Protective cage made of steel mesh
• Diffuser face with anodised finish, E6-C-0, natural colour
• Protective cage powder-coated RAL 9010, pure white
• Extended border powder-coated RAL 9006, white aluminium
• P1: Powder-coated, RAL CLASSIC colour

Technical data

• Nominal sizes: 425, 600, 775, 1050 mm
• Minimum volume flow rate: 95 – 675 l/s or 342 – 2430 m³/h
• Maximum volume flow rate, with L_WA ≅ 50 dB(A): 280 – 1490 l/s or 1008 – 5364 m³/h
• Supply air to room air temperature difference: –12 to +15 K

Sizing data

• V _______________________ [m³/h]
• Δp_t _______________________ [Pa]

Air-regenerated noise

• L_WA _______________________ [dB(A)]

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₁ [mm]

Outer diameter of a circular diffuser face

ØD₂ [mm]

Diameter of a circular diffuser face style

ØD₃ [mm]

Diameter of a circular plenum box

□Q₁ [mm]

Outer diameter of a square diffuser face

□Q₂ [mm]

Dimensions of a square diffuser face style

□Q₃ [mm]

Dimensions of a square plenum box

H₁ [mm]

Distance (height) from the lower edge of the suspended ceiling to the lower edge of the diffuser face

H₂ [mm]

Height of a ceiling diffuser, from the lower edge of the suspended ceiling to the upper edge of the spigot

H₃ [mm]

Height of a ceiling diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box or of the spigot

A [mm]

Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling

C [mm]

Length of the spigot

m [kg]

Weight

Nomenclature

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δt_z [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δp_t [Pa]

Total differential pressure

A_eff [m²]

Effective air discharge area

All sound power levels are based on 1 pW.