AWT-A/825×225
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Ventilation grille with special profiled blades (rectangular cross section)
Optional equipment and accessories
Application
Special characteristics
Nominal sizes
Other dimensions upon request
Parts and characteristics
Attachments
Accessories
Construction features
Materials and surfaces
Standards and guidelines
Maintenance
Functional description
Ventilation grilles are air terminal devices for the supply air and extract air of ventilation and air conditioning systems. They direct the supply air into the room. Ventilation grilles with adjustable blades allow for adapting the discharge direction to the local conditions. The result is a mixed flow ventilation in comfort zones and industrial zones, with good overall room ventilation.
Induction slows the airflow down, i.e. the airflow velocity decreases as the distance from the grille increases. The distance at which the airflow velocity reaches a certain defined value, e.g. 0.2 m/s, is called throw distance. The supply air jet from wall grilles that are installed near the ceiling achieves a larger throw distance than a free jet (from a grille that is not installed near the ceiling). Single grilles, groups of grilles and continuous horizontal runs all achieve different throw distances.
In cooling mode it is necessary to take account of the jet deviation towards the occupied zone, which increases as the supply air to room air temperature difference increases and the discharge velocity decreases. In heating mode the supply air jet deviates towards the ceiling. This has no negative effect on the airflow velocity in the occupied zone, but it may affect the complete ventilation of the room.
Nominal sizes | 325 × 125 to 1225 × 325 mm |
Minimum volume flow rate | 17 – 275 l/s or 61 – 990 m³/h |
Maximum volume flow rate, with LWA max. 40 dB(A) without attachments | 95 – 950 l/s or 342 – 3420 m³/h |
Supply air to room air temperature difference | –12 to +4 K |
Volume flow rates apply to supply air
Geometric free area
125 | 0.013 | 0.018 | 0.023 | 0.028 | 0.037 | 0.047 | 0.057 |
225 | 0.031 | 0.042 | 0.054 | 0.065 | 0.087 | 0.109 | 0.132 |
325 |
| 0.066 | 0.084 | 0.102 | 0.136 | 0.171 | 0.206 |
Effective air discharge area (supply air)
125 | 0.015 | 0.020 | 0.025 | 0.031 | 0.040 | 0.050 | 0.060 |
225 | 0.031 | 0.040 | 0.050 | 0.060 | 0.078 | 0.097 | 0.116 |
325 | 0.060 | 0.073 | 0.086 | 0.116 | 0.152 | 0.174 | |
Effective area of extract air grille
125 | 0.011 | 0.015 | 0.018 | 0.023 | 0.029 | 0.036 | 0.043 |
225 | 0.023 | 0.029 | 0.036 | 0.043 | 0.057 | 0.071 | 0.078 |
325 | 0.043 | 0.052 | 0.063 | 0.083 | 0.104 | 0.122 | |
× LWA = 40 dB(A) with unrestricted airflow+ LWA = 40 dB(A) with airflow restricted by 50 %
Ball impact resistant ventilation grilles, rectangular, made of aluminium, for supply and extract air. Rectangular profile border sections with rounded edges Preferably for wall and sill installation but also suitable for rectangular ducts.
Ready-to-install component which consists of a border and fixed horizontal blades.
Countersunk holes for fixing the grille to the installation surface.
Meets the requirements of DIN 18032, part 3.
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: AWT-AG/625×225/A1
Attachments | Damper unit, opposed action blades |
Nominal size | 625 × 225 mm |
Installation subframe | With installation subframe |
Exposed surface | Anodised, E6-C-0, natural colour |
The weight table shows the available nominal sizes
AWT
125 | 1.3 | 1.6 | 2.0 | 2.3 | 3.0 | 3.6 | 4.3 |
225 | 1.9 | 2.4 | 2.9 | 3.4 | 4.4 | 5.4 | 6.4 |
325 | 3.2 | 3.8 | 4.5 | 5.8 | 7.1 | 8.5 | |
Weights apply to ventilation grilles without attachments
Nominal length over 625 mm: with vertical centre mullion
Installation and commissioning
These are only schematic diagrams to illustrate installation details.
Attachments -AG, -DG and Types AGW, DGW
Volume flow rate balancing
When several ventilation grilles are installed on the same duct, it may be necessary to balance the volume flow rates.
Air pattern
Principal dimensions
L [mm]
Nominal length of the ventilation grille
H [mm]
Nominal height of the ventilation grille
m [kg]
Weight
Nomenclature
LWA [dB(A)]
Sound power level of the air-regenerated noise
V [m³/h] and [l/s]
Volume flow rate
Δpt [Pa]
Total differential pressure
lS [m]
Distance from single grille or horizontal run section (throw distance)
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Contact
We are here for you
Please specify your message and type of request.
Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051
Contact
Thank you for your message!
Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051
Type
Attachments
Nominal size [mm]
Installation subframe
Exposed surface
