Black air control elements
Application
Special characteristics
Nominal sizes
Variants
Plenum box and diffuser face fixing
Parts and characteristics
Attachments
Accessories
Construction features
Materials and surfaces
Mineral wool
Standards and guidelines
Maintenance
Functional description
Slot diffusers direct the air from air conditioning systems at an angle 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. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.
Type VSD35-3-AZ slot diffusers have adjustable air control elements. The supply air to room air temperature difference may range from –10 to +10 K.
A damper blade (optional) simplifies volume flow rate balancing for commissioning.
Type VSD35-3-AZ diffusers are space saving supply and extract air combinations.
Nominal length | 600, 750, 900, 1050, 1200 mm |
Number of slots | 3 |
Minimum volume flow rate, with ΔtZ = –6 K | 8 – 15 l/s or 30 – 54 m³/h |
Maximum volume flow rate, with LWA ≅ 50 dB(A) | 25 – 40 l/s or 90 – 144 m³/h |
Supply air to room air temperature difference | –10 to +10 K |
Transmission loss – supply air
600, 750, 900, 1050, 1200 | 14 | 7 | 7 | 4 | 4 |
Transmission loss – extract air
600, 750, 900, 1050, 1200 | 14 | 7 | 7 | 4 | 4 |
Transmission loss – supply air
600, 750 | 16 | 13 | 14 | 16 | 25 |
900, 1050, 1200 | 18 | 12 | 14 | 21 | 26 |
Transmission loss – extract air
600, 750 | 15 | 11 | 11 | 15 | 22 |
900, 1050, 1200 | 17 | 11 | 13 | 19 | 25 |
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°.
VSD35-3-AZ, sound power level and total differential pressure
600 | 8 | 30 | 6 | 3 | 15 | 9 | 5 | 17 | 26 | 13 | 24 |
600 | 15 | 54 | 19 | 9 | 31 | 31 | 16 | 34 | 85 | 43 | 40 |
600 | 25 | 90 | 54 | 26 | 45 | 86 | 45 | 47 | 237 | 120 | 54 |
600 | 30 | 108 | 77 | 37 | 50 | 124 | 65 | 52 | 341 | 173 | 59 |
750 | 10 | 37 | 7 | 4 | 21 | 12 | 8 | 23 | 28 | 19 | 31 |
750 | 20 | 72 | 28 | 15 | 38 | 44 | 31 | 40 | 107 | 74 | 47 |
750 | 25 | 90 | 44 | 24 | 44 | 68 | 48 | 46 | 167 | 116 | 53 |
750 | 30 | 108 | 64 | 35 | 48 | 98 | 70 | 51 | 241 | 167 | 57 |
900 | 12 | 44 | 9 | 6 | 23 | 14 | 10 | 26 | 37 | 28 | 29 |
900 | 20 | 72 | 24 | 15 | 36 | 37 | 27 | 39 | 97 | 74 | 44 |
900 | 30 | 108 | 55 | 33 | 46 | 82 | 60 | 50 | 217 | 167 | 55 |
900 | 35 | 126 | 74 | 45 | 51 | 112 | 82 | 54 | 296 | 228 | 60 |
1050 | 15 | 54 | 12 | 8 | 28 | 17 | 15 | 30 | 58 | 39 | 38 |
1050 | 25 | 90 | 34 | 22 | 40 | 48 | 41 | 44 | 161 | 110 | 51 |
1050 | 35 | 126 | 66 | 43 | 49 | 95 | 80 | 53 | 316 | 215 | 60 |
1050 | 40 | 144 | 86 | 56 | 52 | 124 | 104 | 56 | 413 | 281 | 63 |
1200 | 15 | 54 | 11 | 8 | 26 | 20 | 13 | 29 | 55 | 41 | 38 |
1200 | 30 | 108 | 44 | 30 | 44 | 79 | 52 | 47 | 218 | 165 | 56 |
1200 | 35 | 126 | 60 | 41 | 48 | 107 | 71 | 52 | 297 | 225 | 60 |
1200 | 40 | 144 | 79 | 54 | 51 | 140 | 92 | 55 | 388 | 293 | 63 |
VSD35-3-AZ-ZT, sound power level and total differential pressure
600 | 8 | 30 | 13 | 9 | 18 | 13 | 10 | 18 | 22 | 17 | 20 |
600 | 15 | 54 | 42 | 30 | 35 | 43 | 35 | 36 | 73 | 58 | 36 |
600 | 20 | 72 | 74 | 53 | 44 | 76 | 62 | 44 | 130 | 104 | 44 |
600 | 25 | 90 | 116 | 83 | 50 | 119 | 96 | 51 | 203 | 162 | 50 |
750 | 10 | 36 | 19 | 15 | 24 | 12 | 16 | 25 | 32 | 31 | 26 |
750 | 15 | 54 | 43 | 33 | 36 | 44 | 36 | 37 | 73 | 69 | 37 |
750 | 20 | 72 | 76 | 58 | 44 | 68 | 65 | 46 | 129 | 122 | 44 |
750 | 25 | 90 | 118 | 91 | 51 | 98 | 101 | 52 | 202 | 191 | 50 |
900 | 12 | 44 | 19 | 14 | 24 | 14 | 17 | 24 | 45 | 36 | 26 |
900 | 20 | 72 | 51 | 37 | 38 | 37 | 44 | 37 | 118 | 95 | 39 |
900 | 25 | 90 | 79 | 58 | 44 | 82 | 69 | 43 | 184 | 149 | 45 |
900 | 30 | 108 | 114 | 83 | 49 | 112 | 100 | 48 | 265 | 215 | 50 |
1050 | 15 | 54 | 27 | 21 | 30 | 17 | 31 | 31 | 65 | 56 | 32 |
1050 | 25 | 90 | 76 | 59 | 44 | 48 | 86 | 45 | 182 | 155 | 45 |
1050 | 30 | 108 | 110 | 84 | 49 | 95 | 124 | 50 | 261 | 223 | 50 |
1050 | 35 | 126 | 149 | 115 | 53 | 124 | 169 | 54 | 356 | 304 | 54 |
1200 | 15 | 54 | 28 | 21 | 30 | 20 | 26 | 29 | 65 | 54 | 31 |
1200 | 20 | 72 | 49 | 38 | 38 | 79 | 45 | 37 | 116 | 95 | 39 |
1200 | 30 | 108 | 111 | 85 | 49 | 107 | 102 | 48 | 261 | 215 | 49 |
1200 | 35 | 126 | 151 | 115 | 53 | 140 | 139 | 52 | 355 | 292 | 53 |
Slot diffusers with individually manually adjustable air control elements and an aesthetically shaped face section with three slots, for angled one-way air discharge. Supply and extract air combination. For wall and bulkhead installation.
Ready-to-install component which consists of the diffuser face with individually adjustable black or white air control elements, and of a plenum box with a side entry spigot and a side extract air spigot.
Screw fixing or rigid fixing to the plenum box
Spigot suitable for circular ducts to EN 1506 or EN 13180.
Sound power level of the air-regenerated noise measured according to EN ISO 5135.
Transmission loss measured according to EN ISO 7235.
Special characteristics
Materials and surfaces
Mineral wool
Technical data
Sizing data
Air-regenerated noise
This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.
![]() VSD35-3-AZ Slot diffuser as supply and extract air combination ![]() AK With rigid fixing AS With screw fixing ![]() No entry: none ZT With ![]() No entry: none M With ![]() No entry: none L With lip seal | ![]() ![]() No entry: none C2 Both ends with factory fitted end angles ![]() No entry: none W00 Fixing brackets for fixing the diffuser to the wall (supplied separately) ![]() No entry: anodised, E6-C-0, natural colour P1 Powder-coated, specify RAL CLASSIC colour RAL 9010 50 % RAL 9006 30 % All other RAL colours 70 % ![]() No entry: similar to RAL 9005, black WW Similar to RAL 9010, white |
Order example: VSD35-3-AZ-AS-ZT-M-L/900/C2/W00/P1-RAL 9010/WW
Connection | With screw fixing |
Acoustic lining (accessory) | With |
Damper blade for volume flow rate balancing | With |
Accessories | Lip seal |
Nominal size | 900 mm |
End pieces | End angle |
Fixing | Fixing brackets |
Exposed surface | RAL 9010, pure white, gloss level 50 % |
Colour of air control elements | White |
mm LN | mm | mm | mm | mm | mm | mm | kg |
mm LN | mm | mm | mm | mm | mm | mm | mm | kg |
Profiles
Aeff: One-way angled air discharge (supply air)
mm LN | m² |
Installation and commissioning
These are only schematic diagrams to illustrate installation details.
mm LN | mm | mm |
Volume flow rate balancing
When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.
Principal dimensions
ØD [mm]
Outer diameter of the spigot
L₁ [mm]
Length of diffuser without end pieces
L₃ [mm]
Length of plenum box
P [mm]
Width of diffuser face – with extended border, if any
B₃ [mm]
Width of plenum box
H₃ [mm]
Height of slot diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box
Y [mm]
Neck extension – The neck length results from a fixed length plus the neck extension
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
fm [Hz]
Octave band centre frequency
LWA [dB(A)]
Sound power level of the air-regenerated noise
V [m³/h] and [l/s]
Volume flow rate
Δpt [Pa]
Total differential pressure
All sound power levels are based on 1 pW.
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