Application
Special characteristics
Nominal sizes
Variants
Parts and characteristics
Attachments
Construction features
Materials and surfaces
Standards and guidelines
Maintenance
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
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
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
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
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
Materials and surfaces
Technical data
Sizing data
Air-regenerated noise
This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.
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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 % |
Installation and commissioning
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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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
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.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265