SD | S.A. TROX Belgium/TROX Belgium N.V.

SD-Q-LQ

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

Allgemeine Informationen

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

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 air ducts according to DIN EN 1506 or DIN EN 13180

Material 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 DIN EN ISO 5135

Maintenance

Low maintenance as construction and materials are not subject to wear and tear
Inspection and cleaning according to VDI 6022

Technical information

Function, Technical Data , Quick Sizing, Specification Text, Order Code

Schematic illustration

① Diffuser face
② Central fixing screw
③ Decorative cap
④ Seal
Optional
⑤ Spigot
⑥ Wood screw (three screws supplied with spigot)
⑦ Cross bar

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.

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

NG	qv [l/s]	qv [m³/h]	Δp_t [Pa]	L_WA [dB(A)]
180	10	36	8	<15
	15	54	18	24
	20	72	33	32
	25	90	51	39

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

NG	qv [l/s]	qv [m³/h]	Δp_t [Pa]	L_WA [dB(A)]
180	10	36	3	<15
	15	54	7	21
	20	72	12	32
	25	90	19	40

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

NG	qv [l/s]	qv [m³/h]	Δp_t [Pa]	L_WA [dB(A)]
180	10	36	9	<15
	15	54	21	25
	20	72	38	34
	25	90	59	41

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

NG	qv [l/s]	qv [m³/h]	Δp_t [Pa]	L_WA [dB(A)]
180	10	36	4	<15
	15	54	10	25
	20	72	18	35
	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 zones. Installation into the vertical parts of steps, or into horizontal or sloping floor areas which do not carry foot traffic
Ready-to-install component, consisting 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 air ducts according to DIN EN 1506 or DIN EN 13180.
Sound power level of the air-regenerated noise measured according to DIN 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

Material 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

qv [m³/h]
Δpt [Pa]

Air-regenerated noise

LWA [dB(A)]

SD	–	Q	–	LQ	–	S	/	180	/	P1 - RAL 9006
\|		\|		\|		\|		\|		\|
1		2		3		4		5		6

Type
SD Staircase swirl diffuser

2 Construction style
Q Square diffuser face
R Circular diffuser face

3 Diffuser face style
LQ Square (construction style Q only)
LR circular

4 Fixing
S With spigot
T With cross bar

5 Nominal size [mm]
180

6 Exposed surface
No entry: powder-coated, RAL 9010 (pure white)
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: SD-Q-LQ-S/180/P1-RAL9006

Type	SD
Construction style	Square diffuser face
Perforation pattern	square
Fixing	with spigot
Nominal size [mm]	180
Exposed surface	powder-coated, RAL 9006 (white aluminium)

Variants, Attachments, Dimensions

SD-Q-LQ

SD-Q-L*-S

SD-Q-LQ

Product details

SD-Q-LQ, vertical installation into steps

Installation and commissioning

Flush installation into vertical, horizontal or sloping surfaces which do not carry foot traffic
Installation with cross bar results in angled air discharge
Installation with spigot results in parallel air discharge

The schematic diagrams are provided to illustrate installation details.

Downloads

product information

Product data sheet Type SD

SD_PD_2024_04_04_DE_en Product data sheet 730 KB pdf

certificates

Declaration of hygiene conformity Type SD

SD_HC_2024_05_DE_en Hygiene certificate 1,6 MB pdf
Non-CE Manufacturer's statement SD

SD_NotCE_2022_02_08_14_41_14_DE_en Certificate 1,6 MB pdf

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SD

For installation into steps and floor areas with no foot traffic

Allgemeine Informationen

Technical information

Function, Technical Data , Quick Sizing, Specification Text, Order Code

Variants, Attachments, Dimensions

Product details

Downloads

product information

Product data sheet Type SD

certificates

Declaration of hygiene conformity Type SD

Non-CE Manufacturer's statement SD

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