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CNC-1A (RAL9016) • Circular nozzle diffusers with circular pattern

  • Multinozzle diffusers
  • Circular
  • Steel and plastics
  • White, RAL 9016
  • Adjustable

Multinozzle ceiling diffusers with high induction rate, consisting of a circular plate with individual adjustable nozzles arranged in a circular pattern to be equipped with galvanized steel plenum box.

Brand

  • Cairox

Application

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

Material

  • Steel and plastic composite combination

Colour

  • Standard colour white, RAL 9016
  • Nozzles and diffuser available in RAL 9016 / 9010 / 9006 / 9005

Composition

  • Frontplate made of powder coated steel
  • Nozzles made out op plastic composite
  • Central screw mounting

Mounting

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

Accessories

  • Circular plenum box RER-B
  • Circular insulated plenum box RER-B ISO
  • Regulating valve for plenum box type CRC

Text for tender

Copy
  • The air supply ceiling diffusers are circular with a circular arranged nozzlepattern. They are made of a steel powdercoated frontplate in white finish RAL 9016 and nozzles in plastic composite materials. The diffusers are standard delivered with galvanized steel plenumbox equipped with perforated plate and damper in the side entry spigot. The diffuser is centrally screw mounted.
  • Cairox type CNC-1A + RER-A

Order example

  • CNC-1A, 600 + RER-B 600 + CRC 250

Explanation

CNC-1A = Diffuser type

600 = Diffuser size

Accessories

RER-B = Plenum box

600 = Size plenum box

CRC = Regulating valve for plenum box
250 = Plenum box connection diameter 250

Dimensions

CNC-1A

ØA [mm]

# Nozzles

300

300

22

400

400

42

500

500

68

600

600

100

625*

625

100

* niet meer verkrijgbaar / n'est plus disponible / no longer available

Quick selection

CNC 1A - #Nozzles300 - #22400 - #42500 - #68600 - #100 / 625* - #100
QAk0.00570.01140.01530.0258
B1.22.43.61.22.43.61.22.43.61.22.43.6
50 H=2.70.30.120.060.250.10.05      
VzH=3.20.140.070.040.120.060.03      
 H=3.80.070.040.020.060.030.02      
Vk2.41.2  
X0,251.61.5  
Ps62  
Lw(A)24<20  
75 H=2.70.420.190.110.340.150.080.320.140.08   
VzH=3.20.220.120.070.170.090.060.160.080.05   
 H=3.80.120.070.050.090.060.040.080.050.03   
Vk3.71.81.4 
X0,251.81.71.6 
Ps1342 
Lw(A)33<20<20 
100 H=2.70.530.270.160.420.20.120.380.180.10.30.130.07
VzH=3.20.290.170.110.220.130.080.20.110.070.150.080.05
 H=3.80.170.110.080.130.080.050.110.070.050.080.050.03
Vk4.92.41.81.1
X0,252.11.91.81.6
Ps24742
Lw(A)3823<20<20
150 H=2.7   0.580.30.190.510.260.160.390.180.11
VzH=3.2   0.330.20.140.290.170.110.210.120.07
 H=3.8   0.20.140.10.170.110.080.120.070.05
Vk 3.72.71.6
X0,25 2.32.11.8
Ps 1693
Lw(A) 3327<20
200 H=2.7   0.710.40.260.630.340.220.490.250.15
VzH=3.2   0.430.280.190.370.230.160.270.160.11
 H=3.8   0.280.190.140.230.160.120.160.110.08
Vk 4.93.62.2
X0,25 2.72.42
Ps 28166
Lw(A) 403423
250 H=2.7      0.740.420.280.570.30.19
VzH=3.2      0.460.30.210.330.20.14
 H=3.8      0.30.210.160.20.140.1
Vk  4.52.7
X0,25  2.82.3
Ps  259
Lw(A)  4028
300 H=2.7      0.850.50.340.640.350.23
VzH=3.2      0.540.360.260.390.240.17
 H=3.8      0.360.260.20.240.170.12
Vk  5.43.2
X0,25  3.22.5
Ps  3513
Lw(A)  4533
350 H=2.7         0.730.420.27
VzH=3.2         0.450.290.21
 H=3.8         0.290.210.16
Vk   3.8
X0,25   2.8
Ps   18
Lw(A)   37
400 H=2.7         0.790.470.31
VzH=3.2         0.510.330.24
 H=3.8         0.330.240.18
Vk   4.3
X0,25   3
Ps   23
Lw(A)   41
450 H=2.7         0.860.520.36
VzH=3.2         0.560.380.28
 H=3.8         0.380.280.21
Vk   4.8
X0,25   3.3
Ps   29
Lw(A)   44

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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