Application
Special features
Nominal sizes
Variants
Connection
Accessories
Lip seal
Attachments
Construction features
Square plenum boxes and plenum boxes with vertical connection
Circular plenum boxes with horizontal spigot for nominal sizes 250, 400L, 400H and 600
Plenum box for supply air, with an optimised equalising element that ensures a uniform airflow through the diffuser face
Simple installation of the diffuser face due to central fixing screw with cap
Plenum box for supply air, with an optimised equalising element that ensures a uniform airflow through the diffuser face
Simple installation of the diffuser face due to central fixing screw with decorative cap
Materials and surfaces
Standards and guidelines
Maintenance
① Diffuser face ② Central fixing screw with decorative cap ③ Plenum box ④ Cross bar ⑤ Suspension hole ⑥ Spigot | Optional ⑦ Lip seal ⑧ Damper blade for volume flow rate balancing ⑨ Pressure tap ⑩ Green cord for closing the damper blade ⑪ White cord for opening the damper blade ⑫ Measuring tube ⑬ Text label indicating plenum box variant ⑭ Perforated plate as an equalising element (only for supply air) |
Ceiling 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. Ceiling swirl diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.
Type FD ceiling swirl diffusers have fixed blades. Air discharge is horizontal omni directional. The supply air to room air temperature difference may range from –12 to +10 K.
A damper blade (optional) simplifies volume flow rate balancing for commissioning. Pressure tap and cord-operated damper blade (optional) allow for volume flow rate balancing with the diffuser face in place.
To give rooms an aesthetic, uniform look, Type FD diffusers may also be used for extract air.
Nominal sizes | 300, 400, 500, 600, 625 mm |
Minimum volume flow rate, with Δtz = -6 K | 9 – 28 l/s or 31 – 102 m³/h |
Maximum volume flow rate, with LWA ≅ 50 dB(A) | 70 – 235 l/s or 252 – 846 m³/h |
Supply air to room air temperature difference | -12 – 10 K |
The quick sizing table gives a good overview of the possible volume flow rates and the corresponding sound power levels and differential pressures.
The minimum volume flow rates apply to a supply air to room air temperature difference of –6 K.
The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.
Exact values for all parameters can be determined with our Easy Product Finder design program.
FD-*-Z-H (supply air), sound power level and total differential pressure
NS | qv [l/s] | qv [m³/h] | 0° | 45° | 90° | |||
---|---|---|---|---|---|---|---|---|
Δpt [Pa] | LWA [dB(A)] | Δpt [Pa] | LWA [dB(A)] | Δpt [Pa] | LWA [dB(A)] | |||
300 | 9 | 31 | 1 | <15 | 1 | <15 | 2 | <15 |
35 | 126 | 13 | 28 | 17 | 27 | 27 | 27 | |
55 | 198 | 31 | 39 | 41 | 40 | 67 | 39 | |
80 | 288 | 67 | 50 | 87 | 54 | 142 | 54 | |
400 | 16 | 59 | 1 | <15 | 1 | <15 | 2 | <15 |
60 | 216 | 10 | 24 | 14 | 25 | 27 | 26 | |
105 | 378 | 32 | 39 | 42 | 40 | 83 | 44 | |
145 | 522 | 60 | 50 | 81 | 53 | 158 | 57 | |
500 | 24 | 85 | 1 | <15 | 2 | <15 | 4 | <15 |
80 | 288 | 12 | 24 | 19 | 26 | 43 | 29 | |
135 | 486 | 33 | 39 | 53 | 41 | 123 | 45 | |
185 | 666 | 62 | 50 | 99 | 54 | 231 | 58 | |
600, 625 | 28 | 102 | 1 | <15 | 1 | <15 | 3 | <15 |
95 | 342 | 10 | 25 | 15 | 25 | 29 | 24 | |
160 | 576 | 28 | 39 | 41 | 40 | 81 | 39 | |
225 | 810 | 55 | 50 | 81 | 52 | 160 | 53 |
0°, 45°, 90°: Damper blade position
FD-*-Z-V (supply air), sound power level and total differential pressure
NS | qv [l/s] | qv [m³/h] | 0° | 45° | 90° | |||
---|---|---|---|---|---|---|---|---|
Δpt [Pa] | LWA [dB(A)] | Δpt [Pa] | LWA [dB(A)] | Δpt [Pa] | LWA [dB(A)] | |||
300 | 9 | 31 | 1 | <15 | 1 | <15 | 2 | <15 |
30 | 108 | 9 | 25 | 11 | 25 | 19 | 25 | |
50 | 180 | 26 | 38 | 32 | 38 | 54 | 38 | |
70 | 252 | 51 | 49 | 62 | 49 | 106 | 49 | |
400 | 16 | 59 | 1 | <15 | 1 | <15 | 2 | <15 |
60 | 216 | 10 | 24 | 13 | 23 | 23 | 24 | |
105 | 378 | 31 | 39 | 40 | 39 | 72 | 42 | |
145 | 522 | 60 | 50 | 77 | 51 | 138 | 55 | |
500 | 24 | 85 | 1 | <15 | 1 | <15 | 4 | <15 |
80 | 288 | 11 | 24 | 14 | 23 | 44 | 29 | |
130 | 468 | 28 | 38 | 36 | 39 | 117 | 44 | |
180 | 648 | 54 | 50 | 70 | 53 | 223 | 56 | |
600, 625 | 28 | 102 | 1 | <15 | 1 | <15 | 2 | <15 |
95 | 342 | 9 | 25 | 12 | 24 | 28 | 27 | |
160 | 576 | 26 | 40 | 35 | 41 | 78 | 44 | |
220 | 792 | 50 | 51 | 67 | 55 | 148 | 57 |
0°, 45°, 90°: Damper blade position
Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones, for a maximum air change rate of 35 per hour. Diffuser face with individually manually adjustable air control blades for horizontal swirling supply air discharge creating high induction levels. For installation into all types of suspended ceilings.
Ready-to-install component consisting of the diffuser face with radially arranged, individually adjustable black or white set of air control blades and a plenum box, which is also square in the case of square faceplates (-Q) and round in the case of rounded faceplates (-R). The plenum box has an equalising element for supply air. The plenum box always includes a horizontally or vertically arranged spigot, cross bar and drilled holes or suspension lugs for suspension.
The diffuser face is fixed to the cross bar 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 features
Materials and surfaces
Technical data
FD | – | Q | – | Z | – | H | – | M | – | L | / | 500 | / | P1 - RAL … |
| | | | | | | | | | | | | | | | |||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Construction style | Square |
System | Supply air |
Connection | Horizontal |
Damper blade for volume flow rate balancing | With cord and pressure tap |
Accessories | without accessories |
Nominal size | 500 |
Exposed surface | RAL 9016, traffic white, GU70 |
Construction style | Circular |
System | Supply air |
Connection | Horizontal |
Damper blade for volume flow rate balancing | Without |
Accessories | Without |
Nominal size | 600 |
Exposed surface | RAL 9010, pure white, GU50 |
NS | □Q₁ | H₁ | □Q₃ | H₃ | ∅D | A | C | ① | m |
---|---|---|---|---|---|---|---|---|---|
kg | |||||||||
300 | 298 | 8 | 290 | 250 | 158 | 139 | 50 | AKUni001 | 4 |
400 | 398 | 8 | 372 | 295 | 198 | 164 | 50 | AKUni002 | 6.2 |
500 | 498 | 8 | 476 | 295 | 198 | 164 | 50 | AKUni003 | 8.5 |
600 | 598 | 8 | 567 | 345 | 248 | 199 | 48 | AKUni004 | 11.6 |
625 | 623 | 8 | 567 | 345 | 248 | 199 | 48 | AKUni004 | 11.9 |
① Plenum box
Weights apply to the supply air variant.
FD-Q-*-VNS | □Q₁ | H₁ | ∅D₃ | H₃ | ∅D | C | m |
---|---|---|---|---|---|---|---|
kg | |||||||
300 | 298 | 8 | 275 | 200 | 158 | 50 | 3 |
400 | 398 | 8 | 364 | 200 | 198 | 50 | 4.7 |
500 | 498 | 8 | 462 | 200 | 198 | 50 | 6.7 |
600 | 598 | 8 | 559 | 200 | 248 | 48 | 8.9 |
625 | 623 | 8 | 559 | 200 | 248 | 48 | 9.2 |
Weights apply to the supply air variant.
NS | ∅D₁ | H₁ | H₃ | ∅D₃ | ∅D | A | ① | m |
---|---|---|---|---|---|---|---|---|
kg | ||||||||
300 | 273 | 8 | 243 | 274 | 158 | 139 | AKR-01 | 2.4 |
400 | 362 | 8 | 290 | 363 | 198 | 166 | AKR-02 | 3.8 |
500 | 460 | 8 | 290 | 461 | 198 | 166 | AKR-03 | 5.2 |
600 | 573 | 8 | 344 | 574 | 248 | 195 | AKR-05 | 7.4 |
625 | 573 | 8 | 344 | 574 | 248 | 195 | AKR-05 | 7.6 |
Weights apply to the supply air variant.
① Plenum box
FD-R-*-VNS | ∅D₁ | H₁ | H₃ | ∅D₃ | ∅D | C | ① | m |
---|---|---|---|---|---|---|---|---|
kg | ||||||||
300 | 300 | 8 | 285 | 278 | 158 | 50 | AK-Uni-013 | 2.8 |
400 | 400 | 8 | 330 | 362 | 198 | 50 | AK-Uni-014 | 4.4 |
500 | 500 | 8 | 330 | 460 | 198 | 50 | AK-Uni-015 | 6.3 |
600 | 600 | 8 | 380 | 557 | 248 | 48 | AK-Uni-016 | 8.5 |
625 | 625 | 8 | 380 | 557 | 248 | 48 | AK-Uni-016 | 8.7 |
NS | □Q₁ | ∅D₂ | Aeff |
---|---|---|---|
m² | |||
300 | 298 | 250 | 0.0088 |
400 | 398 | 350 | 0.0180 |
500 | 498 | 450 | 0.0251 |
600 | 598 | 538 | 0.0295 |
625 | 623 | 538 | 0.0295 |
NS | ∅D₁ | ∅D₂ | Aeff |
---|---|---|---|
m² | |||
300 | 300 | 250 | 0.0088 |
400 | 400 | 350 | 0.0180 |
500 | 500 | 450 | 0.0251 |
600 | 600 | 538 | 0.0295 |
625 | 625 | 538 | 0.0295 |
Installation and commissioning
These are only schematic diagrams to illustrate installation details.
Volume flow rate balancing
When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.
Volume flow rate measurement
Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN) allow for volume flow rate balancing even with the diffuser face in place.
A characteristic is included with each AK-Uni plenum box.
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