Application
Special characteristics
Nominal sizes
Variants
Connection
Only RFD-R
Only RFD-R-D
Parts and characteristics
Attachments
Accessories
Construction features
Materials and surfaces
Standards and guidelines
Maintenance
Functional description
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 RFD 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 RFD diffusers may also be used for extract air.
Nominal sizes | 125, 160, 200, 250, 315, 400 mm |
Minimum volume flow rate, with ΔtZ = –6 K | 4 – 36 l/s or 14 – 130 m³/h |
Maximum volume flow rate, with LWA ≅ 50 dB(A) | 22 – 330 l/s or 79 – 1188 m³/h |
Supply air to room air temperature difference | –12 to +10 K |
Quick sizing tables provide a good overview of the volume flow rates and 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 programme.
RFD-*-K, sound power level and total differential pressure
125 | 4.4 | 16 | 2 | <15 |
125 | 10 | 36 | 16 | 29 |
125 | 15 | 54 | 36 | 38 |
125 | 24 | 86 | 92 | 50 |
160 | 5 | 18 | 1 | <15 |
160 | 15 | 54 | 8 | 16 |
160 | 30 | 108 | 34 | 34 |
160 | 47 | 169 | 83 | 50 |
200 | 7 | 25 | 1 | <15 |
200 | 30 | 108 | 15 | 26 |
200 | 50 | 180 | 43 | 38 |
200 | 75 | 270 | 96 | 50 |
250 | 10 | 36 | 1 | <15 |
250 | 45 | 162 | 14 | 27 |
250 | 80 | 288 | 43 | 41 |
250 | 114 | 410 | 87 | 50 |
315 | 19 | 68 | 1 | <15 |
315 | 75 | 270 | 12 | 25 |
315 | 130 | 468 | 37 | 40 |
315 | 185 | 666 | 75 | 50 |
400 | 27 | 97 | 1 | <15 |
400 | 95 | 342 | 12 | 26 |
400 | 165 | 594 | 35 | 40 |
400 | 230 | 828 | 69 | 50 |
RFD-*-D-K, sound power level and total differential pressure
125 | 4.4 | 16 | 1 | <15 |
125 | 15 | 54 | 8 | 18 |
125 | 30 | 108 | 33 | 36 |
125 | 46 | 166 | 79 | 50 |
160 | 6,4 | 23 | 1 | <15 |
160 | 25 | 90 | 8 | 16 |
160 | 45 | 162 | 26 | 33 |
160 | 76 | 274 | 74 | 50 |
200 | 9 | 32 | 0 | <15 |
200 | 45 | 162 | 11 | 23 |
200 | 75 | 270 | 31 | 37 |
200 | 110 | 396 | 66 | 50 |
250 | 14 | 50 | 0 | <15 |
250 | 65 | 234 | 10 | 21 |
250 | 115 | 414 | 33 | 38 |
250 | 164 | 590 | 66 | 50 |
315 | 25 | 90 | 1 | <15 |
315 | 95 | 342 | 11 | 23 |
315 | 165 | 594 | 32 | 38 |
315 | 240 | 864 | 67 | 50 |
400 | 36 | 130 | 1 | <15 |
400 | 135 | 486 | 12 | 24 |
400 | 235 | 846 | 36 | 40 |
400 | 330 | 1188 | 71 | 50 |
RFD-*-US, sound power level and total differential pressure
125 | 4 | 14 | 2 | <15 |
125 | 10 | 36 | 17 | 28 |
125 | 15 | 54 | 37 | 39 |
125 | 22 | 79 | 80 | 50 |
160 | 5 | 18 | 1 | <15 |
160 | 20 | 72 | 15 | 24 |
160 | 30 | 108 | 35 | 37 |
160 | 42 | 151 | 68 | 50 |
200 | 7 | 25 | 1 | <15 |
200 | 30 | 108 | 22 | 23 |
200 | 50 | 180 | 60 | 39 |
200 | 70 | 252 | 117 | 50 |
250 | 10 | 36 | 1 | <15 |
250 | 45 | 162 | 19 | 25 |
250 | 80 | 288 | 61 | 40 |
250 | 114 | 410 | 123 | 50 |
315 | 19 | 68 | 1 | <15 |
315 | 70 | 252 | 17 | 25 |
315 | 130 | 468 | 59 | 42 |
315 | 170 | 612 | 101 | 50 |
400 | 27 | 97 | 1 | <15 |
400 | 90 | 324 | 15 | 24 |
400 | 155 | 558 | 44 | 39 |
400 | 220 | 792 | 88 | 50 |
RFD-*-D-US, sound power level and total differential pressure
125 | 4.4 | 16 | 1 | <15 |
125 | 15 | 54 | 10 | 17 |
125 | 25 | 90 | 28 | 34 |
125 | 38 | 137 | 64 | 50 |
160 | 6 | 22 | 1 | <15 |
160 | 25 | 90 | 9 | 16 |
160 | 45 | 162 | 29 | 35 |
160 | 66 | 238 | 62 | 50 |
200 | 9 | 32 | 1 | <15 |
200 | 40 | 144 | 22 | 20 |
200 | 70 | 252 | 66 | 37 |
200 | 102 | 367 | 140 | 50 |
250 | 14 | 50 | 1 | <15 |
250 | 60 | 216 | 21 | 22 |
250 | 105 | 378 | 63 | 39 |
250 | 145 | 522 | 120 | 50 |
315 | 25 | 90 | 2 | <15 |
315 | 90 | 324 | 21 | 22 |
315 | 155 | 558 | 62 | 38 |
315 | 220 | 792 | 125 | 50 |
400 | 36 | 130 | 1 | <15 |
400 | 120 | 432 | 17 | 22 |
400 | 205 | 738 | 49 | 38 |
400 | 285 | 1026 | 95 | 50 |
RFD-*-A, sound power level and total differential pressure
125 | 4 | 14 | 2 | <15 | 3 | <15 | 4 | <15 |
125 | 10 | 36 | 17 | 28 | 19 | 28 | 26 | 28 |
125 | 15 | 54 | 38 | 38 | 43 | 39 | 58 | 38 |
125 | 22 | 79 | 82 | 50 | 93 | 49 | 124 | 50 |
160 | 5 | 18 | 1 | <15 | 1 | <15 | 1 | <15 |
160 | 15 | 54 | 9 | 16 | 11 | 17 | 15 | 15 |
160 | 30 | 108 | 35 | 34 | 43 | 36 | 60 | 34 |
160 | 47 | 169 | 86 | 50 | 105 | 51 | 147 | 51 |
200 | 7 | 25 | 1 | <15 | 1 | <15 | 1 | <15 |
200 | 25 | 90 | 12 | 21 | 15 | 21 | 20 | 21 |
200 | 44 | 158 | 36 | 35 | 45 | 36 | 61 | 35 |
200 | 70 | 252 | 91 | 50 | 114 | 52 | 156 | 51 |
250 | 10 | 36 | 1 | <15 | 1 | <15 | 1 | <15 |
250 | 45 | 162 | 14 | 25 | 19 | 26 | 25 | 25 |
250 | 75 | 270 | 40 | 38 | 52 | 40 | 70 | 39 |
250 | 110 | 396 | 86 | 50 | 113 | 52 | 151 | 52 |
315 | 19 | 68 | 1 | <15 | 1 | <15 | 2 | <15 |
315 | 70 | 252 | 12 | 24 | 17 | 26 | 22 | 24 |
315 | 120 | 432 | 35 | 39 | 49 | 40 | 63 | 38 |
315 | 175 | 630 | 75 | 50 | 103 | 52 | 135 | 50 |
400 | 27 | 97 | 1 | <15 | 1 | <15 | 1 | <15 |
400 | 90 | 324 | 10 | 24 | 13 | 25 | 17 | 24 |
400 | 160 | 576 | 33 | 40 | 40 | 41 | 53 | 39 |
400 | 220 | 792 | 63 | 50 | 75 | 52 | 100 | 49 |
RFD-*-D-A, sound power level and total differential pressure
125 | 4.4 | 16 | 1 | <15 | 1 | <15 | 3 | <15 |
125 | 15 | 54 | 12 | 19 | 17 | 20 | 33 | 23 |
125 | 30 | 108 | 48 | 37 | 68 | 40 | 132 | 41 |
125 | 43 | 155 | 98 | 50 | 139 | 52 | 271 | 53 |
160 | 6.4 | 23 | 1 | <15 | 1 | <15 | 2 | <15 |
160 | 30 | 108 | 16 | 22 | 24 | 22 | 44 | 25 |
160 | 50 | 180 | 45 | 37 | 68 | 38 | 123 | 41 |
160 | 71 | 256 | 91 | 50 | 138 | 53 | 250 | 54 |
200 | 9 | 32 | 1 | <15 | 1 | <15 | 2 | <15 |
200 | 40 | 144 | 13 | 21 | 19 | 22 | 34 | 24 |
200 | 70 | 252 | 39 | 37 | 59 | 38 | 104 | 40 |
200 | 105 | 378 | 89 | 50 | 133 | 53 | 234 | 54 |
250 | 14 | 50 | 1 | <15 | 1 | <15 | 2 | <15 |
250 | 60 | 216 | 12 | 20 | 18 | 23 | 32 | 23 |
250 | 108 | 389 | 39 | 37 | 58 | 39 | 103 | 40 |
250 | 153 | 551 | 79 | 50 | 116 | 53 | 207 | 52 |
315 | 25 | 90 | 1 | <15 | 2 | <15 | 2 | <15 |
315 | 90 | 324 | 13 | 23 | 20 | 25 | 29 | 25 |
315 | 150 | 540 | 35 | 38 | 55 | 40 | 82 | 40 |
315 | 215 | 774 | 72 | 50 | 114 | 52 | 168 | 52 |
400 | 36 | 130 | 1 | <15 | 1 | <15 | 2 | <15 |
400 | 120 | 432 | 11 | 23 | 15 | 23 | 22 | 23 |
400 | 205 | 738 | 33 | 38 | 44 | 39 | 65 | 39 |
400 | 290 | 1044 | 65 | 50 | 87 | 50 | 131 | 51 |
Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones and industrial zones. Diffuser face with fixed 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 which consists of the diffuser face with radially arranged fixed air control blades and either a spigot only or a plenum box with side entry or top entry spigot, and suspension holes or suspension lugs.
The diffuser face is fixed to the cross bar with a central screw.
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
Life cycle assessment
A life cycle assessment is available for the product series in form of an Environmental Product Declaration (EPD) that has been checked and published by a programme holder.
Order example: RFD–Q–D–A–M–l/200/P1-RAL
Construction style | Square |
Construction | With discharge nozzle |
Connection | Horizontal |
Damper blade for volume flow rate balancing | With |
Accessories | Lip seal |
Nominal size | 200 |
Exposed surface | RAL 9010, traffic white, gloss level 20 % |
RFD-Q-K
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-Q-D-K
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-Q-US
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-Q-D-US
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-Q-A
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-Q-D-A
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-K
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-D-K
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-US
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-D-US
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-UO
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-D-UD
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-A
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-D-A
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-R-D-N
Variant
Nominal sizes
Parts and characteristics
Construction features
RFD-Q-K, RFD-Q-D-K
RFD-Q-K mm |
RFD-Q-K mm |
RFD-Q-K kg |
RFD-Q-D-K mm |
RFD-Q-D-K mm |
RFD-Q-D-K kg | mm | mm | |
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RFD-Q-US, RFD-Q-D-US
RFD-Q-US mm |
RFD-Q-US mm |
RFD-Q-US kg |
RFD-Q-D-US mm |
RFD-Q-D-US mm |
RFD-Q-D-US kg | mm | mm | mm | mm | |
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RFD-Q-A, RFD-Q-D-A
RFD-Q-A mm |
RFD-Q-A mm |
RFD-Q-A mm |
RFD-Q-A kg |
RFD-Q-D-A mm |
RFD-Q-D-A mm |
RFD-Q-D-A mm |
RFD-Q-D-A kg | mm | mm | mm | mm | mm | mm | ||
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RFD-R-K, RFD-R-D-K
RFD-R-K mm |
RFD-R-K m² |
RFD-R-K mm |
RFD-R-K kg |
RFD-R-D-K mm |
RFD-R-D-K m² |
RFD-R-D-K mm |
RFD-R-D-K kg | mm | mm | mm | |
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RFD-R-US, RFD-R-D-US
RFD-R-US mm |
RFD-R-US mm |
RFD-R-US kg |
RFD-R-D-US mm |
RFD-R-D-US mm |
RFD-R-D-US kg | mm | mm | mm | mm | |
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RFD-R-UO, RFD-R-D-UD
RFD-R-UO mm |
RFD-R-UO mm |
RFD-R-UO kg |
RFD-R-D-UD mm |
RFD-R-D-UD mm |
RFD-R-D-UD kg | mm | mm | mm | mm | |
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RFD-R-A, RFD-R-D-A
RFD-R-A mm |
RFD-R-A mm |
RFD-R-A mm |
RFD-R-A kg |
RFD-R-D-A mm |
RFD-R-D-A mm |
RFD-R-D-A mm |
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RFD-R-D-N
mm | mm | mm | mm | mm | mm | mm | mm | kg | |
RFD-Q
RFD-Q-K mm |
RFD-Q-K m² |
RFD-Q-D-K mm |
RFD-Q-D-K m² | mm | |
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RFD-R
RFD-R-K mm |
RFD-R-K m² |
RFD-R-D-K mm |
RFD-R-D-K m² | mm | |
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Installation and commissioning
These are only schematic diagrams to illustrate installation details.
Ceiling cut-out
125 mm |
125 mm |
160 mm |
160 mm |
200 mm |
200 mm |
250 mm |
250 mm |
315 mm |
315 mm |
400 mm |
400 mm | |
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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.
Principal dimensions
ØD [mm]
Outer diameter of the spigot
ØD₁ [mm]
Outer diameter of a circular diffuser face
ØD₂ [mm]
Diameter of a circular diffuser face style
ØD₃ [mm]
Diameter of a circular plenum box
□Q₁ [mm]
Outer diameter of a square diffuser face
□Q₂ [mm]
Dimensions of a square diffuser face style
□Q₃ [mm]
Dimensions of a square plenum box
H₁ [mm]
Distance (height) from the lower edge of the suspended ceiling to the lower edge of the diffuser face
H₂ [mm]
Height of a ceiling diffuser, from the lower edge of the suspended ceiling to the upper edge of the spigot
H₃ [mm]
Height of a ceiling diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box or of the spigot
A [mm]
Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling
C [mm]
Length of the spigot
m [kg]
Weight
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.: +27 33 3981006
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.: +27 33 3981006