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PS/PRN (RAL9016) • Diffusers for system ceilings

  • Circular conical diffusers
  • Square
  • Aluminium & steel
  • White, RAL 9016
  • Fixed cones

Round ceiling diffusers with fixed diffusion rings in plate for system ceiling 600 X 600 for radial air discharge

Brand

  • Cairox

Application

  • For air supply and exhaust in ventilation and air conditioning systems
  • Simple to integrate into suspended ceiling.
  • Suitable for areas with high comfort requirements due to rapid reduction of temperature and air velocity because of an high induction rate.

Material

  • Aluminium and steel combination

Colour

  • Standard colour white, RAL 9016
  • Other colours available upon request

Composition

  • fixed diffusion rings

Mounting

  • Fixing directly on the collar

Accessories

  • Plenum box type RER-LB
  • Insulated plenum box type RER-LB ISO
  • Plenumbox connection valve type CRC
  • Butterfly volume control damper for mounting on the neck of the diffuser, type DR

Text for tender

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  • The circular ceiling diffusers have fixed diffusion blades. They are made of steel and aluminium with white powdercoating finish RAL 9016 and supplied with a volume control damper in the plenum box.
  • Cairox type PS/PRN+RER-LB

Order example

  • PS/PRN, 200 + RER-LB + CRC 160


Explanation

PS/PRN = Diffuser type

200 = Diffuser size (Ø diffuser neck connection)

Accessories

RER-LB = Plenum box

CRC = Plenumbox connection valve
160 = Plenumbox connection diameter 160

Dimensions

PS/PRN

C [mm]

ØB [mm]

ØD [mm]

150

595

210

149

200

595

260

199

250

595

300

249

300

595

350

314

Quick selection

PS/PRN150200250300
QAk0.00920.01380.02060.0312
B1.22.43.61.22.43.61.22.43.61.22.43.6
50 H=2.70.380.130.08         
VzH=3.20.140.080.06         
 H=3.80.080.060.04         
Vk1.5   
X0,251.7   
Ps1   
Lw(A)<20   
100 H=2.70.770.260.150.630.210.13      
VzH=3.20.290.160.110.230.130.09      
 H=3.80.160.110.090.130.090.07      
Vk32  
X0,252.12  
Ps42  
Lw(A)<20<20  
150 H=2.71.150.380.230.940.310.190.770.260.15   
VzH=3.20.430.250.170.350.20.140.290.160.12   
 H=3.80.250.170.130.20.140.110.160.120.09   
Vk4.532 
X0,252.62.32.1 
Ps842 
Lw(A)<20<20<20 
300 H=2.72.30.770.461.880.630.381.540.510.311.250.420.25
VzH=3.20.860.490.340.70.40.280.580.330.230.470.270.19
 H=3.80.490.340.270.40.280.220.330.230.180.270.190.14
Vk9.1642.7
X0,2543.532.7
Ps321463
Lw(A)3929<20<20
400 H=2.7   2.50.830.52.050.680.411.660.550.33
VzH=3.2   0.940.540.380.770.440.310.620.360.25
 H=3.8   0.540.380.290.440.310.240.360.250.19
Vk 8.15.43.6
X0,25 4.23.73.2
Ps 26115
Lw(A) 3929<20
500 H=2.7      2.560.850.512.080.690.42
VzH=3.2      0.960.550.380.780.450.31
 H=3.8      0.550.380.30.450.310.24
Vk  6.74.5
X0,25  4.33.7
Ps  188
Lw(A)  3727
600 H=2.7      3.071.020.612.50.830.5
VzH=3.2      1.150.660.460.940.530.37
 H=3.8      0.660.460.350.530.370.29
Vk  8.15.3
X0,25  4.94.2
Ps  2611
Lw(A)  4333
800 H=2.7         3.331.110.67
VzH=3.2         1.250.710.5
 H=3.8         0.710.50.38
Vk   7.1
X0,25   5.2
Ps   20
Lw(A)   43

Symbols and specifications

  • Q = Air Volume in m³/h
  • Ak = Effective surface (free area) in m²
  • B = Distance between diffusers in m
  • H = Installation height of the diffusers in m
  • Vz = Maximum velocity at the occupied zone regarding distance between diffusers and installation height in m/s
  • Vk = Average effective velocity through the grill in m/s
  • X0.25 = Throw length in m at an endvelocity Vt of 0,25m/s
  • Ps = Static pressure loss given in Pa
  • Lw(A) = Acoustic power in dB(A)


  • The throw X0.25 is given at an end velocity of 0.25m/s for a smooth ceiling without any obstacles.
  • The values are given for isothermal supply air. Throw distances for cooling conditions at -11K can be calculated by deviding the X0.25 values with factor 1.1. For heating purposes at Dt of +11K a multiplier of 1.1 should be applied to the given X0.25 value.
  • 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
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