Application
Special characteristics
Nominal sizes
Variants
Connection
Parts and characteristics
Attachments
Useful additions
Construction features
Materials and surfaces
Standards and guidelines
Maintenance
Functional description
Ceiling diffusers direct the air from air conditioning systems into the room. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling diffusers allow for large volume flow rates. The result is a mixed flow ventilation for industrial and comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.
Type VDR ceiling diffusers have adjustable blades. The air pattern can be adjusted to meet different local requirements. Horizontal air discharge is omni directional. Vertical air discharge is possible in heating mode. The supply air to room air temperature difference may range from –10 to +15 K.
An actuator (optional) adjusts the blades based on demand.
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 LWA ≅ 50 dB(A) | 320 – 1495 l/s or 1152 – 5382 m³/h |
Supply air to room air temperature difference | –10 to +15 K |
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
315 | 175 | 630 | 5 | 19 |
315 | 255 | 918 | 10 | 32 |
315 | 335 | 1206 | 17 | 42 |
315 | 420 | 1512 | 27 | 50 |
400 | 250 | 900 | 5 | 18 |
400 | 400 | 1440 | 14 | 32 |
400 | 550 | 1980 | 26 | 44 |
400 | 650 | 2340 | 36 | 50 |
630 | 555 | 1998 | 7 | 30 |
630 | 680 | 2448 | 11 | 38 |
630 | 805 | 2898 | 15 | 45 |
630 | 925 | 3330 | 20 | 50 |
800 | 556 | 2500 | 6 | 27 |
800 | 870 | 3132 | 8 | 33 |
800 | 1185 | 4266 | 16 | 42 |
800 | 1495 | 5382 | 25 | 50 |
VDR-H, sound power level and total differential pressure
315 | 175 | 630 | 22 | 28 |
315 | 230 | 828 | 38 | 37 |
315 | 280 | 1008 | 57 | 45 |
315 | 320 | 1152 | 74 | 50 |
400 | 250 | 900 | 19 | 27 |
400 | 320 | 1152 | 31 | 36 |
400 | 390 | 1404 | 46 | 43 |
400 | 465 | 1674 | 65 | 50 |
630 | 490 | 1764 | 24 | 28 |
630 | 615 | 2214 | 38 | 36 |
630 | 740 | 2664 | 55 | 44 |
630 | 870 | 3132 | 75 | 50 |
800 | 695 | 2502 | 21 | 30 |
800 | 855 | 3078 | 31 | 37 |
800 | 1015 | 3654 | 44 | 44 |
800 | 1180 | 4248 | 59 | 50 |
VDR-V, sound power level and total differential pressure
315 | 175 | 630 | 10 | 29 |
315 | 230 | 828 | 18 | 38 |
315 | 280 | 1008 | 27 | 45 |
315 | 320 | 1152 | 35 | 50 |
400 | 250 | 900 | 9 | 30 |
400 | 330 | 1188 | 16 | 38 |
400 | 405 | 1458 | 24 | 45 |
400 | 480 | 1728 | 33 | 50 |
630 | 490 | 1764 | 18 | 27 |
630 | 650 | 2340 | 32 | 36 |
630 | 810 | 2916 | 49 | 44 |
630 | 970 | 3492 | 71 | 50 |
800 | 695 | 2502 | 15 | 28 |
800 | 940 | 3384 | 27 | 36 |
800 | 1190 | 4284 | 43 | 44 |
800 | 1450 | 5220 | 64 | 50 |
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
Materials and surfaces
Technical data
Sizing data
Air-regenerated noise
Order example: VDR-H-E2/800
Connection | Horizontal |
Adjustment | Actuator 24 V AC |
Nominal size | 800 |
Exposed surface of diffuser face | RAL 9010, pure white, gloss level 50 % |
VDR
Variant
Nominal sizes
Parts and characteristics
Construction features
VDR-E*
Variant
Nominal sizes
Parts and characteristics
Construction features
VDR-H
Variant
Nominal sizes
Parts and characteristics
Construction features
VDR-V
Variant
Nominal sizes
Parts and characteristics
Construction features
VDR
mm | mm | mm | mm | kg | |
VDR-E*
mm | mm | mm | mm | kg | |
VDR-H
mm | mm | mm | mm | mm | mm | mm | kg | |
Weights apply to the variant with actuator
VDR-V
mm | mm | mm | m² | mm | mm | mm | kg | |
Weights apply to the variant with actuator
VDR
mm | m² | |
Installation and commissioning
Installation information
These are only schematic diagrams to illustrate installation details.
Ceiling cut-out
mm | |
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
LWA [dB(A)]
A-weighted sound power level of air-regenerated noise
V [m³/h] and [l/s]
Volume flow rate
Δtz [K]
Supply air to room air temperature difference, i.e. supply air temperature minus room temperature
Δpt [Pa]
Total differential pressure
Aeff [m²]
Effective air discharge area
All sound power levels are based on 1 pW.
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We are here for you
Please specify your message and type of request.
Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051
Contact
Thank you for your message!
Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051