Type SDW 

With low sound power level for comfort zones, with individually manually adjustable air control blades

Square ceiling swirl diffusers for high room air change rates

  • Nominal sizes 300, 400, 500, 600, 625
  • Volume flow rate range 7 – 310 l/s or 26 – 1116 m³/h
  • Diffuser face made of galvanised sheet steel, powder-coated
  • For supply and extract air
  • For variable and constant volume flows
  • For all types of ceiling systems
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9m (center line to center line)
  • Ideal for comfort zones


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colors, air control blades in black or white
  • Horizontal or vertical duct connection
  • Plenum box with cord-operated damper blade and pressure tap

APPLICATION

Application

  • Type SDW ceiling swirl diffusers are used as supply air or extract air diffusers for comfort zones
  • Attractive design element for building owners and architects with demanding aesthetic requirements
  • Horizontal swirling supply air discharge for mixed flow ventilation
  • The efficient swirl creates high induction levels, thereby rapidly reducing the temperature difference and airflow velocity (supply air variant)
  • Individually adjustable air control blades to meet individual requirements
  • For variable and constant volume flows
  • For supply air to room air temperature differences from –12 to 10K
  • For room heights up to 4m (lower edge of suspended ceiling)

Special characteristics

  • Air control blades can be adjusted individually manually for adjusting the air pattern
  • For all types of ceiling system
  • Black or white air control blades
  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (center line to center line)

Nominal sizes

  • 300 x 8, 400 x 16, 500 x 24, 600 x 24, 600 x 48, 625 x 24, 625 x 54

DESCRIPTION

Variants

  • SDW: Swirl diffuser


Installation type

  • Q: Face mounted
  • QL: Lay-in flat 'T' bar
  • QS15: Tegular 'T' bar 15x8
  • QS26: Tegular 'T' bar 26x8
  • QM15: Tegular 'T' bar 15x16
  • QM26: Tegular 'T' bar 26x16
  • QB: Push-in spring 'T' (Burgess)


Construction style

  • SDW-*-Z: Supply
  • SDW-*-A: Extract
  • SDW-*-F: Face only (QL, QM, QS only)


Connection 1)

  • SDW-*-AH: Horizontal extract
  • SDW-*-ZH: Horizontal supply
  • SDW-*-ZV: Vertical supply
  • SDW-*-AV: Vertical extract
  • RA: Return air baffle

1) In combination with AKV-SDW

Parts and characteristics

  • Square diffuser face
  • Diffuser face with individually manually adjustable air control blades
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • Damper blade for volume flow rate balancing (optional)


Accessories

  • Plenum box with horizontal and vertical connection
  • Return air baffle

Construction features

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


Materials and surfaces

  • Diffuser face made of galvanised sheet steel
  • AKV: plenum box and cross bar made of galvanised sheet steel
  • Air control blades made of plastic, UL 94, V-0, flame retardant
  • P3: Exposed diffuser face powder-coated RAL 9010, 20% gloss
  • P2: Exposed diffuser face powder-coated RAL 9006, 25% gloss
  • P4: Exposed diffuser face powder-coated RAL 9005, 20% gloss
  • P6: Powder-coated, RAL CLASSIC colour 25% gloss
  • Air control blades for supply air similar to RAL 9005, black; extract air variant without air control blades
  • Q11: Air control blades for extract air similar to RAL 9005, black
  • Q21: Air control blades for supply air and extract air 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, Technical data, Quick sizing, Specification text, Order code

  • FUNCTION
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE

Functional description

Ceiling swirl diffusers in air conditioning systems create a swirl to supply air to rooms. 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 swirl diffusers allow for large volume flow rates. 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 SDW ceiling swirl diffusers have adjustable air control blades. The air pattern can be adjusted to meet different local requirements. Horizontal air discharge is one-way, two-way or omni directional. Vertical air discharge is possible but only for heating. The supply air to room air temperature difference may range from –12 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning. Pressure tap and cord-operated damper blade (optional) allow for volume flow rate balancing with the diffuser face in place.

To give rooms an aesthetic, uniform look, Type SDW diffusers may also be used for extract air. Air control blades are not required for extract air applications.

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures. The minimum volume flow rates apply to a supply air to room air temperature difference of –6K. 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.


Ceiling swirl diffusers with square diffuser face. Supply air and extract air variants for comfort zones, for a maximum air change rate of 35 per hour. Diffuser face with individually manually adjustable air control blades for horizontal swirling supply air discharge creating high induction levels. For installation into all types of suspended ceilings.

Ready-to-install component which consists of the diffuser face with radially arranged, individually adjustable black or white air control blades, and of a plenum box, equalising element (only supply air variants), side entry or top entry spigot, cross bar, and suspension holes or suspension lugs.

The diffuser face is fixed to the cross bar with a central screw, concealed by a decorative cap.

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

  • Air control blades can be adjusted individually manually for adjusting the air pattern
  • For all types of ceiling systems
  • Black or white air control blades
  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)


Materials and surfaces

  • Diffuser face made of galvanised sheet steel
  • AKV: plenum box and cross bar made of galvanised sheet steel
  • Air control blades made of plastic, UL 94, V-0, flame retardant
  • P3: Exposed diffuser face powder-coated RAL 9010, 20% gloss
  • P2: Exposed diffuser face powder-coated RAL 9006, 25% gloss
  • P4: Exposed diffuser face powder-coated RAL 9005, 20% gloss
  • P6: Powder-coated, RAL CLASSIC colour 25% gloss
  • Air control blades for supply air similar to RAL 9005, black; extract air variant without air control blades
  • Q11: Air control blades for extract air similar to RAL 9005, black
  • Q21: Air control blades for supply air and extract air similar to RAL 9010, white


Technical data

  • Nominal sizes: 300, 400, 500, 600, 625 mm
  • Minimum volume flow rate, with ΔtZ = –6 K: 7 – 52 l/s or 26 – 186 m³/h
  • Maximum volume flow rate, with LWA ≅ 50 dB(A): 85 – 310 l/s or 306 – 1116 m³/h
  • Supply air to room air temperature difference: –12 to +10 K


Sizing data

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


Air-regenerated noise

  • LWA _______________________ [dB(A)]

Variants and accessories, Dimensions and weight, Product details

  • Variants
  • DIMENSIONS AND WEIGHT
  • PRODUCT DETAILS

SDW-...+ AKV-SDW-...*H

  • Ceiling swirl diffuser with square diffuser face
  • With plenum box for horizontal duct connection


Nominal sizes

  • 300 × 8, 400 × 16, 500 × 24, 600 × 24, 600 × 48, 625 × 24, 625 × 54 

Parts and characteristics

  • Square diffuser face
  • Plenum box for horizontal duct connection
  • Square opening to accommodate the diffuser face
  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)
  • Simple installation of the diffuser face due to central fixing screw with decorative cap 
  • Damper blade for volume flow rate balancing (optional)
  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)

Construction features

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


SDW-... + AKV-SDW-...-*V

Variant

  • Ceiling swirl diffuser with square diffuser face
  • With plenum box for vertical duct connection


Nominal sizes

  • 300 × 8, 400 × 16, 500 × 24, 600 × 24, 600 × 48, 625 × 24, 625 × 54


Parts and characteristics

  • Square diffuser face
  • Plenum box for vertical duct connection
  • Circular opening to accommodate the diffuser face
  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

  • Simple installation of the diffuser face due to central fixing screw with decorative cap

  • Damper blade for volume flow rate balancing (optional)


Construction features

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


Installation examples, Installation details, Commissioning, Basic information and nomenclature

  • INSTALLATION EXAMPLES
  • INSTALLATION DETAILS
  • COMMISSIONING
  • BASIC INFORMATION AND NOMENCLATURE

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • Flush ceiling installation
  • Horizontal or vertical duct connection
  • If necessary, carry out volume flow rate balancing with the damper blade


These are only schematic diagrams to illustrate installation details.

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

  • Ceiling diffusers with plenum box and damper blade (variant -M): The diffuser face can be removed to access the damper blade; the damper blade can then be set to any position between 0 and 90°
  • Ceiling diffusers with horizontal plenum box, damper blade and pressure tap (variant -MN): The diffuser face need not be removed since the damper blade can be set with the cord


Volume flow rate measurement

Ceiling diffusers with plenum box, damper blade and pressure tap (variant -MN) allow for volume flow rate balancing even with the diffuser face in place.

  • Connect the measuring tube to the digital manometer
  • Read the effective pressure
  • Read the volume flow rate off the characteristic or calculate it
  • If necessary, adjust the damper blade position with the cord

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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Contact

Thank you for your message!

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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.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051