Type VSD35 Varyset

For large, variable volume flow rate ranges, stable discharge patterns even with small volume flow rates

Slot diffusers with 35 mm nominal width, with adjustable air control elements and self-powered Varyset flap for the adjustment of the active slot diffuser length

  • Nominal length from 900 to 1500 mm, 1 or 4 slots
  • Volume flow rate range 8 – 90 (l/s)/m or 29 – 324 (m³/h)/m
  • Diffuser face made of extruded aluminium sections
  • For variable volume flows
  • Excellent room ventilation even with small volume flow rates due to self-powered Varyset flap
  • Suitable for continuous linear arrangement
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Individually adjustable air control elements to meet individual local requirements


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours
  • Diffuser face with extended border
  • End plates, end angles

VSD35-1-VA/1200 00131172_0
  • Application
  • Description

Application

  • Type VSD35 Varyset slot diffusers are used as supply air diffusers in comfort zones
  • They blend in inconspicuously with continuous grid ceilings and plasterboard ceilings
  • Excellent room ventilation even with minimum volume flow rates (Vmin)
  • Air discharge is one-way or alternating horizontal, or alternating angled; turbulent flow (mixed flow ventilation)
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • For variable volume flows
  • For supply air to room air temperature differences from –10 to +10 K
  • For room heights up to 4 m (lower edge of suspended ceiling)
  • For suspended ceilings; suitable for restricted ceiling voids due to the low overall height of the plenum box
  • Suitable for continuous linear arrangement

Special characteristics

  • Individually adjustable air control elements to meet individual local requirements
  • Excellent room ventilation even with minimum volume flow rates (Vmin)
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Diffuser face has been optimised for maximum volume flow rate at low sound power levels
  • Suitable for continuous linear arrangement

Nominal sizes

  • LN: 900, 1050, 1200, 1350, 1500 mm
  • Diffuser face available in intermediate sizes from 901 to 2550 mm, in increments of 1 mm

Variants

  • VSD35-VA-*: 1, 2, 3 or 4 slots
  • VSD35-VA-...: Diffuser face without extended border
  • VSD35-VA-.../B00: Diffuser face with extended border
  • VSD35-VA-...: Black air control elements
  • VSD35-VA-.../WW: White air control elements,

Parts and characteristics

  • Diffuser face with individually adjustable air control elements
  • Plenum box for horizontal duct connection
  • Self-powered Varyset flap with external balance weight
  • Protective cap for the balance weight
  • Clamp fixing
  • Connecting pins and alignment plates to connect and align slot diffusers for a continuous linear arrangement

Attachments

  • C1, C2: Two end plates
  • C5, C6: Two end angles

Accessories

  • Lip seal

Useful additions

  • EP: Two end plates
  • EW: Two end angles
  • To be ordered separately for continuous linear runs
  • Corner section, see Type VSD35

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

Materials and surfaces

  • Diffuser face made from extruded aluminium sections
  • Air control elements made of plastic, UL 94, V-0, flame retardant
  • Plenum box made of galvanised sheet steel
  • Varyset flap, end plate and end angle made of aluminium
  • Lip seal made of rubber
  • Diffuser face with anodised finish, E6-C-0, natural colour
  • P1: Powder-coated, RAL CLASSIC colour
  • Air control elements similar to RAL 9005, black
  • WW: Air control elements similar to RAL 9010, white

Standards and guidelines

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

Maintenance

  • Maintenance-free as construction and materials are not subject to wear
  • Inspection and cleaning to VDI 6022

Technical information

  • Function
  • Technology
  • Quick sizing
  • Specification text
  • Order code
Schematic illustration of VSD35 Varyset 00129740_0

① Diffuser face
② Adjustable air control element
③ Neck
④ Plenum box
⑤ Suspension lug
⑥ Varyset casing with damper blade and balance weight
⑦ Spigot
⑧ Clamp fixing

Functional description

Slot diffusers direct the air from air conditioning systems into the room, either horizontally or at an angle. 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 Varyset slot diffusers have adjustable air control elements. The air pattern can be adjusted to meet different local requirements. Air discharge is one-way or alternating horizontal. Heating mode with angled air discharge is also possible. The supply air to room air temperature difference may range from –10 to +10 K.


Principle of operation – Varyset

Each diffuser requires for a stable horizontal air pattern in cooling mode a certain minimum volume flow rate; this minimum flow rate depends on the supply air to room air difference. If the actual volume flow rate is lower than the required minimum, the supply air does not adhere to the ceiling long enough, or not at all, but 'falls' immediately vertically into the occupied zone. This may result in draughts.

The Varyset diffuser allows for smaller minimum volume flow rates and hence for larger variable volume flow rate ranges.

The discharge velocity is reduced more slowly with decreasing volume flow rates when a Varyset diffuser is used. This ensures the self-powered Varyset flap within the plenum box. At the minimum volume flow rate the Varyset flap remains closed, and the supply air is discharged through only 25 % of the total slot length. As the volume flow rate increases, the Varyset damper opens due to the dynamic pressure. More and more air flows through the remaining slot length.


Advantages of Varyset

  • Stable horizontal air discharge in cooling mode with a large variable volume flow rate range
  • Elimination of draughts with the minimum volume flow rate
  • Excellent room ventilation even with the minimum volume flow rate
  • Smaller vertical temperature differences in the occupied zone, particularly in heating mode with angled air discharge

Nominal length900, 1050, 1200, 1350, 1500 mm
Number of slots1, 2, 3, 4
Minimum volume flow rate8 – 22 (l/s)/m or 29 – 80 (m³/h)/m
Maximum volume flow rate33 – 90 (l/s)/m or 120 – 324 (m³/h)/m
Supply air to room air temperature difference–10 to +10 K


Quick sizing – sound power level and total differential pressure

Nominal lengthVΔptLWA
Nominal lengthl/sm³/hPadB(A)
900 7.5 27 10<15
900 15 54 1520
900 30 108 3335
900 35 126 4140
1200 10 36 1215
1200 20 72 1822
1200 40 144 3939
1200 45 162 4643
1500 12.5 45 1924
1500 20 72 2326
1500 40 144 3236
1500 50 180 4042


Quick sizing – sound power level and total differential pressure

Nominal lengthVΔptLWA
Nominal lengthl/sm³/hPadB(A)
900 10 36 616
900 20 72 1222
900 40 144 2733
900 50 180 3738
1200 15 54 916
1200 30 108 1523
1200 60 216 3236
1200 70 252 4140
1500 20 72 1318
1500 40 144 2026
1500 60 216 3135
1500 80 288 4442


Quick sizing – sound power level and total differential pressure

Nominal lengthVΔptLWA
Nominal lengthl/sm³/hPadB(A)
900 15 54 1015
900 30 108 1326
900 60 216 2337
900 70 252 2840
1200 20 72 1221
1200 40 144 1628
1200 80 288 2339
1200 90 324 3042
1500 25 90 1523
1500 50 180 2032
1500 80 288 2539
1500 100 360 3242


Quick sizing – sound power level and total differential pressure

Nominal lengthVΔptLWA
Nominal lengthl/sm³/hPadB(A)
900 20 72 1125
900 40 144 1732
900 60 216 2136
900 80 288 2640
1200 25 90 1021
1200 40 144 1427
1200 60 216 1932
1200 100 360 2840
1500 30 108 1625
1500 50 180 1931
1500 80 288 2337
1500 100 360 2739


Slot diffusers with individually manually adjustable air control elements and an aesthetically shaped face section with one to four slots, for one-way horizontal, alternating horizontal or alternating angled air discharge. For supply air, for large variable volume flow rate ranges. For installation into suspended ceilings.

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 side entry spigot, self-powered Varyset flap and suspension lugs.

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.

Special characteristics

  • Individually adjustable air control elements to meet individual local requirements
  • Excellent room ventilation even with minimum volume flow rates (Vmin)
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Diffuser face has been optimised for maximum volume flow rate at low sound power levels
  • Suitable for continuous linear arrangement

Materials and surfaces

  • Diffuser face made from extruded aluminium sections
  • Air control elements made of plastic, UL 94, V-0, flame retardant
  • Plenum box made of galvanised sheet steel
  • Varyset flap, end plate and end angle made of aluminium
  • Lip seal made of rubber
  • Diffuser face with anodised finish, E6-C-0, natural colour
  • P1: Powder-coated, RAL CLASSIC colour
  • Air control elements similar to RAL 9005, black
  • WW: Air control elements similar to RAL 9010, white

Technical data

  • Nominal length: 900, 1050, 1200, 1350, 1500 mm
  • Number of slots: 1, 2, 3, 4
  • Minimum volume flow rate: 8 – 22 (l/s)/m or 29 – 80 (m³/h)/m
  • Maximum volume flow rate with LWA ≅ 50 dB(A): 33 – 90 (l/s)/m or 120 – 324 (m³/h)/m
  • Supply air to room air temperature difference: –10 to +10 K

00135403_0

 Type
VSD35-VA       Slot diffuser with Varyset

 Number of slots
1
2
3
4

 Nominal size [mm]
       Nominal length LN
900
1050
1200
1350
1500

 End pieces
       No entry: without
       Both ends with end angles factory fitted
C1       to profile 000
C2       to profile B00
       Both ends with end plates factory fitted
C5       to profile 000
C6       to profile B00
       To be ordered separately for slot diffusers for linear arrangement

 

 Extended border
No entry: none
B00       With extended border

 Exposed surface
       No entry: anodised, E6-C-0, natural colour
P1       Powder-coated, specify RAL CLASSIC colour

       Gloss level
       RAL 9010 50 %
       RAL 9006 30 %
       All other RAL colours 70 %

 Air pattern
       No entry: alternating horizontal (WH)
WS       Alternating angled
HL       Horizontal left (opposite direction from spigot)
HR       Horizontal right (same direction as spigot)

 Colour of air control elements
       No entry: similar to RAL 9005, black
WW       Similar to RAL 9010, white

 

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Contact

Thank you for your message!

Visual contact Visual contact

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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265