VDR

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).

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

VDR, sound power level and total differential pressure

VDR-H, sound power level and total differential pressure

VDR-V, sound power level and total differential pressure

Ceiling diffusers with circular diffuser front frame, for comfort and industrial zones. For supply air only. Diffuser face with adjustable air control blades for air discharge from horizontal (0°) to vertical (90°) For freely suspended installation and for suspended ceilings.

Ready-to-install component which consists of the diffuser face with diffuser front frame and adjustable air control blades, a plenum box with equalising element, side entry or top entry spigot, and suspension holes or suspension lugs.

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

• High penetration of air at low sound power level
• Particularly suitable for rooms with varying heat loads
• Ideal adaptation of the air discharge pattern due to two sections of adjustable blades
• Discharge direction can be adjusted manually or with an actuator
• Plenum box with side entry or top entry spigot, and variant with electric actuator and inspection access

Materials and surfaces

• Blades, front frame and spigot ring made of aluminium
• Plenum box and cross bar made of galvanised sheet steel
• Front frame, blades and spigot ring powder-coated RAL 9010, pure white
• P1: Powder-coated, RAL CLASSIC colour

Technical data

• Nominal sizes: 315, 400, 630, 800 mm
• Minimum volume flow rate: 175 – 695 l/s or 630 – 2502 m³/h
• Maximum volume flow rate, with L_WA ≅ 50 dB(A): 320 – 1495 l/s or 1152 – 5382 m³/h
• Supply air to room air temperature difference: –10 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.