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SRR-D (RAL9016) • Round ceiling diffusers

  • Circular conical diffusers
  • Circular
  • Aluminium
  • White, RAL 9016
  • Adjustable cones and damper

Round ceiling diffusers with adjustable cones

Brand

  • Cairox

Application

  • For supply and exhaust air in ventilation and air conditioning systems

Material

  • Aluminium
  • Inner cone made of ABS

Colour

  • White, RAL 9016
  • Other colours available upon request

Composition

  • Adjustable rings
  • Adjustable damper in plastic

Mounting

  • Direct mounting by the collar in the duct

Accessories

  • Clips mounting system SRR-DMC for plasterboard ceiling

Text for tender

Copy
  • The circular ceiling diffusers shall have adjustable diffusion rings. They shall be made of aluminium with white powder coated finish RAL 9016 and supplied with volume control damper
  • Cairox type SRR-D

Order example

  • SRR-D, 200

Explanation

SRR-D = Type diffuser

200 = Size diffuser (Ø diffuser neck connection)

Dimensions

SRR-D
Ød [mm]ØA [mm]
ØB [mm]H [mm]
160
158335310105
200198423395118
250248517490135
315313640615145

Quick selection

SRR-D160200250315
QAk summer0.0310.0460.0690.106
Ak winter0.0290.0420.060.088
B1.22.43.61.22.43.62.43.64.23.64.24.8
200 H=2.70.430.310.240.330.240.18      
VzH=3.20.320.250.20.250.190.15      
 H=3.80.250.20.170.190.150.13      
Vk summer1.81.2  
Vk winter1.91.3  
X0,252.62  
Y0,25 @Dt +10K2.31.4  
Ps summer52  
Ps winter167  
Lw(A) summer<20<20  
Lw(A) winter30<20  
300 H=2.70.640.460.360.490.350.270.260.20.18   
VzH=3.20.480.370.30.370.280.230.210.170.16   
 H=3.80.370.30.250.280.230.190.170.150.13   
Vk summer2.71.81.2 
Vk winter2.921.4 
X0,253.932.2 
Y0,25 @Dt +10K3.22.82 
Ps summer1252 
Ps winter36168 
Lw(A) summer27<20<20 
Lw(A) winter443321 
400 H=2.70.860.610.480.660.470.370.350.270.250.180.170.15
VzH=3.20.640.50.40.490.380.310.280.230.210.150.140.13
 H=3.80.50.40.340.380.310.260.230.190.180.130.120.11
Vk summer3.62.41.61
Vk winter3.82.61.91.3
X0,255.23.932
Y0,25 @Dt +10K4.23.43.22.6
Ps summer21831
Ps winter6227146
Lw(A) summer3726<20<20
Lw(A) winter544331<20
600 H=2.71.290.920.720.990.710.550.530.410.370.290.260.24
VzH=3.20.970.740.60.740.570.460.430.350.320.250.230.21
 H=3.80.740.60.510.570.460.390.350.290.270.210.190.18
Vk summer5.43.62.41.6
Vk winter5.742.81.9
X0,257.75.94.43.2
Y0,25 @Dt +10K64.74.13.8
Ps summer471873
Ps winter137632913
Lw(A) summer524027<20
Lw(A) winter68574532
800 H=2.7   1.320.940.730.70.550.490.390.350.32
VzH=3.2   0.990.760.620.570.460.420.320.30.27
 H=3.8   0.760.620.520.460.390.360.270.250.24
Vk summer 4.83.22.1
Vk winter 5.33.72.5
X0,25 7.95.94.2
Y0,25 @Dt +10K 6.154.5
Ps summer 32125
Ps winter 1105122
Lw(A) summer 503723
Lw(A) winter 675542

Symbols and specifications

  • Q = Air Volume in m³/h
  • Ak winter = Effective surface (free area) in m² given at the upper position of the inner adjustable cone
  • Ak summer = Effective surface (free area) in m² given at the lower position of the inner adjustable cone
  • B = Distance between diffusers in m
  • H = Installation height of the diffusers in m
  • Vz = Maximum velocity at the occupied zone, given for cooling at the lower position of the inner adjustable cone, regarding the distance between diffusers and installation height in m/s
  • Vk winter = Average effective velocity for Ak winter through the diffuser in m/s
  • Vk summer = Average effective velocity for Ak summer through the diffuser in m/s
  • X0.25 = Horizontal throw in m at an endvelocity Vt of 0,25m/s isothermal at the lower position of the inner cone
  • Y0.25 = Vertical throw in m at an endvelocity Vt of 0,25m/s with a temperature difference of +10K at the upper position of the inner cone
  • Ps winter = Static pressure loss for Ak winter given in Pa
  • Ps summer = Static pressure loss for Ak summer given in Pa
  • Lw(A) winter = Acoustic power for Ak winter in dB(A)
  • Lw(A) summer = Acoustic power for Ak summer in dB(A)


  • The throw X0.25 is given at an end velocity of 0.25m/s for a smooth ceiling without any obstacles.
  • In order to achieve a high comfort level, selections can be made according to the maximal velocity at the occupied zone Vz. These values are given at distances between diffusers B and installation heights H. Velocities Vz lower than, or equal to 0,25m/s at the occupied zone are advised.
  • The pressure losses Ps are given for grilles without damper of with fully opened damper.
  • The acoustic power Lw(A) are given for grilles without damper of with fully opened damper without room attenuation. Acoustic powers below 20dB(A) are mentioned as "<20" in the tables.
  • For all special requirements, please contact our engineering office.

Placement instruction

CFD simulation Cooling

CFD simulation Heating
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