Runder Frontdurchlass
Application
Special characteristics
Nominal sizes
Construction
Diffuser face finish
Plenum finish
Material and surfaces
Standards and guidelines
Maintenance
Ceiling diffusers direct the air from air conditioning systems into the room. 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 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-V ceiling diffusers have fixed blades and an adjustable internal sleeve, allowing for horizontal and vertical air discharge. During cooling air discharge is horizontal and radial, in heating air discharge is vertical. The internal sleeve is controlled with a thermal actuator. The supply air to room air temperature difference may range from -10 to +15K. To give rooms an aesthetic, uniform look. Type RFD-V diffusers may also be used for extract air.
Nominal diffuser sizes | 160, 200, 250, 315 |
Minimum volume flow rate, with Δtz = -8K | 9l/s - 32l/s or 32m3/h - 307m3/h |
Maximum volume flow rate with LWA ≈ 50dB(A) | 64l/s - 195l/s or 230m3/h - 702m3/h |
Usage instructions
Please note that the minimum volume flows are not valid for free hanging or exposed installation. For these types of installation the minimum flow rate is equivalent to an effective discharge velocity of 3.5m/s
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°.
RFD-V-... (supply air), sound power level and total differential pressure.
Nominal size | qv [l/s] | qv [m³/h] | Ø Spigot | Damper blade position | |||||
---|---|---|---|---|---|---|---|---|---|
0⁰ | 45⁰ | 90⁰ | |||||||
Δpₜ [Pa] | LWA [dB(A)] | Δpₜ [Pa] | LWA [dB(A)] | Δpₜ [Pa] | LWA [dB(A)] | ||||
160 | 20 | 72 | 158 | 6 | 17 | 7 | 16 | 10 | 17 |
160 | 33 | 118.8 | 158 | 15 | 31 | 19 | 31 | 27 | 31 |
160 | 47 | 169.2 | 158 | 31 | 41 | 38 | 41 | 56 | 41 |
160 | 60 | 216 | 158 | 51 | 48 | 61 | 48 | 91 | 48 |
200 | 30 | 108 | 198 | 5 | 17 | 7 | 17 | 9 | 17 |
200 | 50 | 180 | 198 | 14 | 32 | 18 | 32 | 26 | 32 |
200 | 70 | 252 | 198 | 28 | 42 | 36 | 42 | 51 | 42 |
200 | 90 | 324 | 198 | 46 | 50 | 60 | 50 | 85 | 50 |
250 | 50 | 180 | 248 | 5 | 20 | 7 | 20 | 10 | 20 |
250 | 80 | 288 | 248 | 14 | 34 | 19 | 34 | 26 | 34 |
250 | 110 | 396 | 248 | 26 | 43 | 36 | 43 | 50 | 43 |
250 | 140 | 504 | 248 | 41 | 50 | 58 | 51 | 81 | 50 |
315 | 70 | 252 | 313 | 5 | 20 | 6 | 20 | 9 | 19 |
315 | 110 | 396 | 313 | 12 | 34 | 16 | 33 | 23 | 33 |
315 | 150 | 540 | 313 | 23 | 43 | 30 | 43 | 42 | 42 |
315 | 190 | 684 | 313 | 36 | 50 | 48 | 50 | 67 | 49 |
Specification text
Swirl diffusers with circular diffuser face. Supply and extract air variants for comfort zones and industrial zones. Diffuser face with fixed control blades and variable internal geometry controlled via thermal actuator. In cooling supply air will discharge in a horizontal swirling pattern creating high induction levels. In heating supply air will switch to vertical discharge to penetrate into the occupied zone. For installation into all types of suspended ceilings and rooms without suspended ceilings. Ready-to-install component which consists of the diffuser face with radially arranged fixed air control blades and a plenum box with side entry, and suspension holes or suspension lugs. The diffuser face is fixed to the cross bar with a central screw. Thermal Actuator temperature range 18 °C to 32 °C. Spigot suitable for ducts to EN 1506 or EN 13180. Sound power level of the air-regenerated noise measured according to EN ISO 5135.
Note: Cooling supply air temperature of <22°C required to reset the thermal actuator
Note: Vertical heating requires supply air temperature of >28°C
Parts and characteristics
Materials and surfaces
Technical data
Usage instructions
RFD-V | – | Z | – | DX | – | D12 | – | M | – | L | – | ADE | / | 200 | × | 198 | / | SB | / | P3 | – | P6 - RAL 9016 |
| | | | | | | | | | | | | | | | | | | | | | | | |||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Type | RFD-V – swirl diffuser |
System | supply air |
Construction | standard |
Inner lining (insulation) | inner lining 12 mm thick |
Spigot damper for volume flow rate balancing | with spigot damper |
Lip seal | with lip seal |
Air distribution element | with air distribution element |
Nominal size [mm] | 200 |
Spigot diameter [mm] | 198 |
Plenum box fixing | fixing brackets |
Exposed surface of diffuser face | powder-coated, RAL 9010 (pure white) |
Surface plenum box | powder-coated, RAL 9016 (traffic white) |
Product details
RFD-V NS | 160 | 200 | 250 | 315 |
---|---|---|---|---|
Ceiling cutout Ød [mm] | 299 | 346 | 397 | 551 |
Thermal actuator function
The RFD-V switches between horizontal and vertical discharge depending on supply air temperature, via a thermal actuator. The diffuser will switch from horizontal discharge to vertical discharge once the supply temperature reaches above 28⁰C. The diffuser will switch back to horizontal discharge from vertical discharge once the supply temperature reaches below 22⁰C.
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.
Ceiling diffusers with plenum box and damper blade
Volume flow rate measurement
Ceiling diffusers with horizontal plenum box, damper blade and pressure diaphragm allow for volume flow rate balancing with the diffuser face in place.
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We are here for you
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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.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051