Type SD

For installation into steps and floor areas with no foot traffic

Circular and square staircase swirl diffusers

  • Nominal size 180 mm
  • Volume flow rate range 10 – 25 l/s or 36 – 90 m³/h
  • Diffuser face made of sheet steel, powder-coated
  • For variable and constant volume flows
  • For false floors and positive pressure plenums
  • Installation into the risers of steps or into horizontal or sloping floor areas which do not carry foot traffic
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Low sound power level due to optimised air distribution inside the diffuser


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours
  • Spigot
  • Cross bar

SD-Q-LQ 00136389_0


  • Application
  • Description

Application

  • Type SD staircase swirl diffusers are primarily used as supply air diffusers for comfort conditioning applications
  • For auditoriums in theatres, cinemas or concert halls
  • Supply air discharge directly to the occupied zone
  • Swirling air discharge, either parallel to the installation surface or angled, for mixed flow ventilation
  • The efficient swirl creates high induction levels, thereby rapidly reducing the temperature difference and airflow velocity (supply air variant)
  • For variable and constant volume flows
  • For supply air to room air temperature differences from –6 to +6 K
  • For false floors and positive pressure plenums
  • Installation into the risers of steps or into horizontal or sloping floor areas which do not carry foot traffic

Special characteristics

  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Air discharge either parallel to the installation surface or angled
  • Excellent air quality since the supply air is discharged directly to the occupied zone
  • Installation into the risers of steps and into floor areas which do not carry foot traffic

Nominal sizes

  • 180

Variants

  • SD-Q-LQ: Square diffuser face, square face style
  • SD-Q-LR: Square diffuser face, circular face style
  • SD-R-LR: Circular diffuser face, circular face style

Parts and characteristics

  • Square or circular diffuser face with four sections of blades
  • Diffuser face with fixed air control blades
  • Angled air discharge from diffuser fixed to cross bar
  • Air discharge parallel to the installation surface from diffuser fixed to spigot
  • Simple installation of the diffuser face due to central fixing screw with decorative cap

Attachments

  • S: Spigot
  • T: Cross bar

Construction features

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

Materials and surfaces

  • Diffuser face made of sheet steel
  • Cross bar and spigot made of galvanised sheet steel
  • Spigot dip coated similar to RAL 9005, black
  • Exposed diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

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

Staircase 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. Staircase swirl diffusers supply the air directly to the occupied zone and even to individual room occupants. The result is mixed flow ventilation for comfort zones and an excellent air quality in the occupied zone.

Type SD staircase swirl diffusers have fixed blades. Different attachments are available to influence the air pattern and adapt it to local requirements. A spigot can be used to achieve air discharge parallel to the installation surface, while a cross bar can be used to achieve angled air discharge. The air pattern should be such that the air does not blow onto the feet of people sitting near the diffuser. If staircase swirl diffusers are placed underneath seats or vertically in the steps between seats, angled air discharge is recommended. If diffusers are placed in the steps below the seats, parallel air discharge is recommended. The supply air to room air temperature difference may range from –6 to +6 K.

Nominal sizes

180 mm

Minimum volume flow rate

10 l/s or 36 m³/h

Maximum volume flow rate

25 l/s or 90 m³/h

Supply air to room air temperature difference

–6 to +6 K


Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

SD-Q-LQ-S (supply air), sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

180

10

36

8

<15

180

15

54

18

24

180

20

72

33

32

180

25

90

51

39


SD-Q-LQ-T (supply air), sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

180

10

36

3

<15

180

15

54

7

21

180

20

72

12

32

180

25

90

19

40


SD-Q-LR-S, SD-R-LR-S (supply air), sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

180

10

36

9

<15

180

15

54

21

25

180

20

72

38

34

180

25

90

59

41


SD-Q-LR-T, SD-R-LR-T (supply air), sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

180

10

36

4

<15

180

15

54

10

25

180

20

72

18

35

180

25

90

27

43


Staircase swirl diffusers with square or circular diffuser face and fixed air control blades for swirling supply air discharge creating high induction levels. For supply air only; for comfort conditioning applications. For installation into the risers of steps or into horizontal or sloping floor areas which do not carry foot traffic.

Ready-to-install component which consists of the diffuser face with fixed air control blades arranged in quadrants.

The diffuser face is fixed to a cross bar or to a spigot 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

  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Air discharge either parallel to the installation surface or angled
  • Excellent air quality since the supply air is discharged directly to the occupied zone
  • Installation into the risers of steps and into floor areas which do not carry foot traffic

Materials and surfaces

  • Diffuser face made of sheet steel
  • Cross bar and spigot made of galvanised sheet steel
  • Spigot dip coated similar to RAL 9005, black
  • Exposed diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes: 180 mm
  • Minimum volume flow rate: 10 l/s or 36 m³/h
  • Maximum volume flow rate: 25 l/s or 90 m³/h
  • Supply air to room air temperature difference: –6 to +6 K

Sizing data

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

Air-regenerated noise

  • LWA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

00137821_0

 Type
SD              Staircase swirl diffuser

 Construction style
Q       Square diffuser face
R       Circular diffuser face

 Diffuser face style
LQ       Square (only available with square diffuser face)
LR       Circular

 

 Fixing
S       to spigot
T       to cross bar

 Nominal size [mm]
180

 Exposed surface
No entry: powder-coated RAL 9010, pure white
P1       Powder-coated, specify RAL CLASSIC colour

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

Order example: SD-Q–LQ–S/180/P1-RAL 9016

Construction style

Square

Diffuser face style

Square

Fixing

Spigot

Nominal size

180

Exposed surface

RAL 9016, traffic white, gloss level 70 %


 

Variants, Attachments, Dimensions and weight, Product details

  • Variants
  • Attachments
  • Dimensions and weight
  • Product details

SD-Q-LQ

Variant

  • Square diffuser face with square face style

SD-Q-LR

Variant

  • Square diffuser face with circular face style

SD-R-LR

Variant

  • Circular diffuser face with circular face style

SD

Produktvariante
m
kg
SD-Q-LQ 0.3
SD-Q-LR 0.3
SD-R-LR 0.3


SD

Produktvariante
Aeff

SD-Q-LQ 0.00445
SD-Q-LR 0.00354
SD-R-LR 0.00354


Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Flush installation into vertical surfaces and into horizontal or sloping surfaces which do not carry foot traffic
  • Diffuser fixed to cross bar provides angled air discharge
  • Diffuser fixed to spigot provides air discharge parallel to the installation surface


These are only schematic diagrams to illustrate installation details.

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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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