00179406_0
SDRF


00182010_0
Spring clip fixing


00182005_0
Screw fixing


00182000_0
Fixing screws concealed with decorative caps


00179406_0
00182010_0
00182005_0
00182000_0

SDRF

Compact height, ideal for steps

Circular and rectangular staircase swirl diffusers

  • Various nominal sizes with 1 – 6 outlets
  • Volume flow rate range 2 – 25 l/s or 7 – 90 m³/h
  • Diffuser face made of sheet steel, powder-coated
  • For variable and constant volume flows
  • For false floors designed as positive pressure plenums
  • Installation into the risers of steps
  • Visible screw fixing
  • 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
  • Spring clip fixing (concealed)

General information

Application

  • Type SDRF 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 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 designed as positive pressure plenums
  • Installation into the risers of steps

Special characteristics

  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Air discharge parallel to the installation surface
  • Excellent air quality since the supply air is discharged directly to the occupied zone
  • Vertical installation into steps

Nominal sizes

  • No. of outlets: 1, 2, 3, 4, 5, 6

Variants

  • SDRF-K: Spring clip fixing
  • SDRF-S: Screw fixing

Parts and characteristics

  • Circular diffuser face with one outlet
  • Rectangular diffuser face with two to six outlets
  • Outlets with fixed blades and with flow-optimising cup; cup with perforated rear plate used as a damper element to improve air distribution if there are several outlets
  • Fixing screws (with decorative caps) facilitate installing the diffuser face
  • Optional spring clip fixing

Materials and surfaces

  • Diffuser face made of sheet steel
  • Cup made of ABS plastic, UL 94, V-0, flame retardant
  • Cup similar to RAL 9005, black
  • Exposed diffuser face powder-coated RAL 9005, jet black
  • 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
Schematic illustration of SDRF/1
00153418_0
A SDRF-S
B SDRF-K
① Diffuser face
② Cup
③ Cross bar
④ Central fixing screw
⑤ Decorative cap
⑥ Spring clip


00153418_0
00182022_0
00180895_0
00180781_0

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 SDRF staircase swirl diffusers have fixed blades. Air discharge parallel to the installation surface. The supply air to room air temperature difference may range from –6 to +6 K.

Nominal sizes

1, 2, 3, 4, 5, 6 outlets

Minimum volume flow rate

2 – 12 l/s or 7 – 43 m³/h

Maximum volume flow rate

5 – 25 l/s or 18 – 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.


SDRF, sound power level and total differential pressure

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

1

2

7

6

<15

1

3

11

14

24

1

4

14

25

33

1

5

18

39

39

2

5

18

9

22

2

7

25

18

31

2

9

32

30

38

2

10

36

37

41

3

6

22

7

19

3

8

29

12

26

3

12

43

27

37

3

14

50

37

41

4

8

29

7

<15

4

12

43

15

29

4

14

50

20

33

4

18

65

33

41

5

10

36

6

17

5

12

43

9

22

5

16

58

16

31

5

20

72

25

38

6

12

43

6

<15

6

16

58

10

23

6

20

72

16

31

6

25

90

25

38

Sizing example
Given data
V = 15 l/s (54 m3/h)
Staircase swirl diffuser
Maximum sound power level 35 dB(A)
Quick sizing
Type SD
Variants: SD-Q-LQ, SD-Q-LR
Type SDRF
Nominal sizes: SDRF/4, SDRF/5
Selected: SDRF/4

Staircase swirl diffusers with rectangular 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.

Ready-to-install component which consists of a diffuser face with up to six outlets. Each outlet with radially arranged fixed blades and a cup with damper element.

Diffuser face with fixing screws (concealed with decorative caps) or with spring clip fixing.

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 parallel to the installation surface
  • Excellent air quality since the supply air is discharged directly to the occupied zone
  • Vertical installation into steps

Materials and surfaces

  • Diffuser face made of sheet steel
  • Cup made of ABS plastic, UL 94, V-0, flame retardant
  • Cup similar to RAL 9005, black
  • Exposed diffuser face powder-coated RAL 9005, jet black
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes: 1, 2, 3, 4, 5 or 6 outlets
  • Minimum volume flow rate: 2 – 12 l/s or 7 – 43 m³/h
  • Maximum volume flow rate: 5 to 25 l/s or 18 to 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.

1 Type
SDRF Staircase swirl diffuser


2 Fixing
K with spring clips
S with screws


3 Number of outlets
1 – 6


4 Exposed surface
No entry: powder-coated, RAL 9005 (jet black)
P1 powder-coated, specify RAL

 CLASSIC colour

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


Order example: SDRF-K/3/P1-RAL9010

TypeSDRF – Staircase swirl diffuser
Fixing with spring clips
Number of outlets3
Exposed surfacepowder-coated, RAL 9010 (pure white)

Variants, Dimensions and weight, Product details

  • VARIANTS
  • DIMENSIONS AND WEIGHT
  • PRODUCT DETAILS
SDRF-K/1
00179823_0


00179823_0
00179468_0
00179406_0
00179411_0
00179533_0
00179416_0

SDRF-K

Variant

  • Staircase swirl diffuser with spring clip fixing


SDRF-S

Variant

  • Staircase swirl diffuser with screw fixing

Diffuser face of SDRF-*/1
00180801_0


00180801_0
00182030_0
00180761_0
00229576_0
00189977_0
00182044_0

SDRF-*/1

Nominal size
 m
kg
1 0.10


SDRF

Nominal size
 L
mm
 A
mm
 C
mm
 m
kg
2 200 74 63 0.15
3 300 87 63 0.25
4 400 86 71 0.35
5 500 92 66 0.45
6 500 74 65 0.50


Diffuser face of SDRF-*/1
00180801_0


00180801_0
00182030_0

SDRF

Nominal size
 Aeff
m²
1 0.000626
2 0.001252
3 0.001878
4 0.002504
5 0.003130
6 0.003756


Installation examples, Installation details, Basic information and nomenclature

  • INSTALLATION EXAMPLES
  • INSTALLATION DETAILS
  • BASIC INFORMATION AND NOMENCLATURE
SDRF-1, vertical installation into steps
00180017_0


00180017_0
00180028_0
SDRF-K/1, vertical installation into steps
00182053_0


00182053_0
00182059_0
00189971_0
00182071_0

Installation and commissioning

  • Flush installation into vertical surfaces
  • Screw fixing or spring clip fixing


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.

Downloads

product information

  • Product data sheet Type SDRF

    SDRF_PD_2024_04_02_DE_en Product data sheet 710 KB pdf

certificates

  • Declaration of hygiene conformity SDRF

    SDRF_HC_2024_05_DE_en Hygiene certificate  980 KB pdf

  • Non-CE Manufacturer's statement SDRF

    SDRF_NotCE_2022_02_08_14_41_10_DE_en Certificate 970 KB pdf

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We are here for you

Please specify your message and type of request
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

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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.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

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