This site uses cookies and related technologies, as described in our privacy policy, for purposes that may include site operation, analytics, enhanced user experience, or advertising. You may choose to consent to our use of these technologies, or manage your own preferences.
Air supply ceiling diffusers with adjustable 1- to 4-way pattern perforated plate.
Brand
Cairox
Application
For air supply in ventilation and air conditioning systems
Material
Steel
Colour
Standard colour white, RAL 9016
Other colours available upon request
Composition
Perforated removable front plate with incorporated top entry plenum box
Perforated innerpart to be opened easily by push-push system
Text for tender
The square air supply ceiling diffusers are of the multidirectional type with a perforated front plate and an incorporated plenum box. They are made of steel in white powdercoating finish RAL 9016.
Cairox type PPTMB
The square air supply ceiling diffusers are of the multidirectional type with a perforated front plate and an incorporated plenum box. They are made of steel in white powdercoating finish RAL 9016.
Cairox type PPTMB
Order example
PPTMB, 200
Explanation
PPTMB = Diffuser type
200 = Diffuser size (connection diameter)
Dimensions
PPTMB
A [mm]
ØN [mm]
160
300
160
200
400
200
250
500
250
Quick selection
PPTMB
300/160
400/200
500/250
Q
Ak
0.0302
0.0591
0.0976
B
1.2
2.4
3.6
1.2
2.4
3.6
1.2
2.4
3.6
150
Vz
H=
2.7
0.97
0.32
0.19
0.69
0.23
0.14
H=
3.2
0.36
0.21
0.15
0.26
0.15
0.1
H=
3.8
0.21
0.15
0.11
0.15
0.1
0.08
Vk
1.4
0.7
X0.25
2.4
2
Ps
8
2
Lw(A)
25
<20
200
Vz
H=
2.7
1.29
0.43
0.26
0.92
0.31
0.18
0.73
0.24
0.15
H=
3.2
0.49
0.28
0.19
0.35
0.2
0.14
0.27
0.16
0.11
H=
3.8
0.28
0.19
0.15
0.2
0.14
0.11
0.16
0.11
0.08
Vk
1.8
0.9
0.6
X0.25
2.8
2.3
2.1
Ps
13
3
1
Lw(A)
34
<20
<20
250
Vz
H=
2.7
1.62
0.54
0.32
1.15
0.38
0.23
0.91
0.3
0.18
H=
3.2
0.61
0.35
0.24
0.43
0.25
0.17
0.34
0.2
0.14
H=
3.8
0.35
0.24
0.19
0.25
0.17
0.13
0.2
0.14
0.11
Vk
2.3
1.2
0.7
X0.25
3.1
2.6
2.3
Ps
22
6
2
Lw(A)
42
22
<20
300
Vz
H=
2.7
1.38
0.46
0.28
1.09
0.36
0.22
H=
3.2
0.52
0.3
0.21
0.41
0.23
0.16
H=
3.8
0.3
0.21
0.16
0.23
0.16
0.13
Vk
1.4
0.9
X0.25
2.9
2.5
Ps
8
3
Lw(A)
28
<20
400
Vz
H=
2.7
1.85
0.62
0.37
1.46
0.49
0.29
H=
3.2
0.69
0.4
0.28
0.55
0.31
0.22
H=
3.8
0.4
0.28
0.21
0.31
0.22
0.17
Vk
1.9
1.1
X0.25
3.4
3
Ps
15
5
Lw(A)
38
23
600
Vz
H=
2.7
2.19
0.73
0.44
H=
3.2
0.82
0.47
0.33
H=
3.8
0.47
0.33
0.25
Vk
1.7
X0.25
3.8
Ps
12
Lw(A)
36
800
Vz
H=
2.7
2.92
0.97
0.58
H=
3.2
1.09
0.63
0.44
H=
3.8
0.63
0.44
0.34
Vk
2.3
X0.25
4.7
Ps
22
Lw(A)
46
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 table values are given for the adjustable deflection plates set at its standard position to achieve an air flow pattern in 4 direction
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.