SDRF

SDRF

Spring clip fixing

Screw fixing

Fixing screws concealed with decorative caps

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

Schematic illustration of SDRF/1

A SDRF-S
B SDRF-K
① Diffuser face
② Cup
③ Cross bar
④ Central fixing screw
⑤ Decorative cap
⑥ Spring clip

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		Δp_t	L_WA
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]
Δp_t _______________________ [Pa]

Air-regenerated noise

L_WA _______________________ [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

Type	SDRF – Staircase swirl diffuser
Fixing	with spring clips
Number of outlets	3
Exposed surface	powder-coated, RAL 9010 (pure white)

Variants, Dimensions and weight, Product details

SDRF-K/1

SDRF-K

Variant

Staircase swirl diffuser with spring clip fixing

SDRF-S

Variant

Staircase swirl diffuser with screw fixing

Diffuser face of SDRF-*/1

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

SDRF

Nominal size	A_eff 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

SDRF-1, vertical installation into steps

SDRF-K/1, vertical installation into steps

Installation and commissioning

Flush installation into vertical surfaces
Screw fixing or spring clip fixing

These are only schematic diagrams to illustrate installation details.

Nomenclature

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δt_z [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δp_t [Pa]

Total differential pressure

A_eff [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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SDRF

Compact height, ideal for steps

General information

TECHNICAL INFORMATION

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

Variants, Dimensions and weight, Product details

Installation examples, Installation details, Basic information and nomenclature

Downloads

product information

Product data sheet Type SDRF

certificates

Declaration of hygiene conformity SDRF

Non-CE Manufacturer's statement SDRF

TROX Services

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE