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PS/APW-4 (RAL9016) • 4-way diffusers for system ceilings

4-way ceiling diffusers for system ceiling with fixed core and central screw mounting.

Brand

  • Cairox

Application

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

Material

  • Aluminium and steel combination

Colour

  • Standard colour white, RAL 9016

Composition

  • Fixed inner core made of aluminium
  • Frame and plate made of steel
  • Fixed 4-way directional blades

Mounting

  • Fixing by central screw in the crossbar of the plenum box.

Accessories

  • Opposite blade volume control damper type OBD
  • Plenum box with side duct connection type SEPB
  • Insulated plenum box with side duct connection type SEPB-INS
  • Plenumbox connection valve type KDK

Text for tender

Copy
  • The air supply ceiling diffusers for ceiling systems are square with a fixed 4-way pattern with a fixed core. They are made of aluminium and steel in white powder coating finish RAL 9016 and are supplied with a volume control damper and a plenum box with a crossbar.
  • Cairox type PS/APW-4+DSF+SEPB

Order example

  • PS/APW-4, 444 + SEPB + DSF

Explanation

PS/APW-4 = Diffuser type

444 = Diffuser size

Accessories (Optional)

SEPB = Plenum box

DSF = Volume control damper

Dimensions

 L x H [mm]
PS/APW-4 294/150145 x 145
PS/APW-4 369/225220 x 220
PS/APW-4 444/300295 x 295
PS/APW-4 519/375370 x 370

Quick selection

PS/APW-4 294/150369/225444/300519/375
 LxH145x145220x220295x295370x370
QAk0.01090.02440.04350.0679
B1.22.43.61.22.43.61.22.43.61.22.43.6
100 H=2.70.520.170.1         
VzH=3.20.20.110.08         
 H=3.80.110.080.06         
Vk2.5   
X0,251.8   
Ps4   
Lw(A)22   
150 H=2.70.780.260.160.520.170.1      
VzH=3.20.290.170.120.20.110.08      
 H=3.80.170.120.090.110.080.06      
Vk3.81.7  
X0,252.11.8  
Ps102  
Lw(A)32<20  
200 H=2.71.040.350.210.70.230.14      
VzH=3.20.390.220.160.260.150.1      
 H=3.80.220.160.120.150.10.08      
Vk5.12.3  
X0,252.42  
Ps184  
Lw(A)3922  
300 H=2.7   1.040.350.210.780.260.16   
VzH=3.2   0.390.220.160.290.170.12   
 H=3.8   0.220.160.120.170.120.09   
Vk 3.41.9 
X0,25 2.52.1 
Ps 83 
Lw(A) 3220 
400 H=2.7   1.390.460.281.040.350.210.830.280.17
VzH=3.2   0.520.30.210.390.220.160.310.180.13
 H=3.8   0.30.210.160.220.160.120.180.130.1
Vk 4.62.61.6
X0,25 2.92.52.2
Ps 1552
Lw(A) 3928<20
600 H=2.7      1.560.520.311.250.420.25
VzH=3.2      0.590.340.230.470.270.19
 H=3.8      0.340.230.180.270.190.14
Vk  3.82.5
X0,25  3.12.7
Ps  104
Lw(A)  3829
800 H=2.7      2.090.70.421.670.560.33
VzH=3.2      0.780.450.310.630.360.25
 H=3.8      0.450.310.240.360.250.19
Vk  5.13.3
X0,25  3.73.2
Ps  188
Lw(A)  4536
1000 H=2.7         2.090.70.42
VzH=3.2         0.780.450.31
 H=3.8         0.450.310.24
Vk   4.1
X0,25   3.7
Ps   12
Lw(A)   41
1200 H=2.7         2.50.830.5
VzH=3.2         0.940.540.38
 H=3.8         0.540.380.29
Vk   4.9
X0,25   4.2
Ps   17
Lw(A)   46

Symbols and specifications

  • Q = Air volume in m³/h
  • Ak = Effective surface (free area) in m²
  • B = Distance between the diffusers in m
  • H = Installation height of the diffusers in m
  • Vz = Maximum velocity at the occupied zone according to distance between the diffusers and installation height in m/s
  • Vk = Average effective velocity through the diffuser in m/s
  • X0.25 = Throw length in m at an end velocity 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 dividing 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 diffusers without damper of with fully opened damper.
  • The acoustic power values Lw(A) are given for diffusers 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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