VTU/VTI - Diffusers

 

General

EXHAUSTO VTU and VTI diffusers are used as part of a ventilation system, where there is a need for balanced air replacement. The diffusers can be fitted directly to an EXHAUSTO spiro tube using the bayonet mount supplied with the diffuser.

VTU extraction diffusers can be ceiling or wall-mounted. VTI supply air diffusers are designed to be fitted in the centre of the ceiling.

The diffusers are fitted with a rotatable valve disc, which makes it possible to set the air gap to the required capacity. A foam rubber ring glued to the diffuser ensures air-tightness between fitting and bayonet mount.

VTU and VTI are made from white-lacquered steel sheet - RAL9003.

Dimensioned drawings

VTU/VTI

VTU 

  

VTU målskitse

Type Nominal diameter
Ød, mm
ØD, mm
VTU100 100 130
VTU125 125 160
VTU160 160 190
VTU200 200 245

 

 

VTI

VTI målskitse

Type Nominal diameter
Ød, mm
ØD, mm
VTI100 100 130
VTI125 125 160
VTU - Capacity diagrams

VTU

The drawings  show the capacity with the control valve fitted in the pipe socket The drawings show volume flow qv (l/s and m3/h), total pressure drop pt (Pa), and A-weighted sound power level (LWA) for various settings a (mm)

VTU100

VTU100 kapacitetskurve

 

 

VTU125

VTU125 kapacitetskurve

 

VTU160

VTU160 kapacitetskurve

 

VTU200

VTU200 kapacitetskurve

VTI - Capacity diagrams

VTI

The drawings  show the capacity with the control valve fitted in the pipe socket The drawings show volume flow qv (l/s and m3/h), total pressure drop pt (Pa), Throw length L02 (m) and A-weighted sound power level (LWA) for various settings a (mm)

VTI100

VTI100 kapacitetskurve

 

 

VTI125

VTI125 kapacitetskurve

 

Sound data

VTU/VTI

Sound power level in octave band Lw (dB)
Sound pressure level Lw (dB) = LWA + Kok
The LWA can be read off the capacity charts. The constant Kok can be seen on the tables below.

 

VTU

Model Average frequency (Hz)
125 250 500 1000 2000 4000 8000
VTU100 -8 -5 -6 -6 -4 -12 -21
VTU125 -11 -4 -6 -7 -3 -16 -25
VTU160 -7 -4 -6 -3 -6 -18 -31
VTU200 -7 -6 -7 -2 -9 -18 -27
Tol. ± 3 2 2 2 2 2 3

 

VTI

Model Average frequency (Hz)
125 250 500 1000 2000 4000 8000
VTI100 2 2 -1 -6 -14 -25 -37
VTI125 2 4 -2 -7 -14 -25 -37
Tol. ± 3 2 2 2 2 2 3
 

 

Integrated sound attenuation ΔL (dB)

The fitting's integrated sound attenuation includes end reflection with the fitting connected to the duct.

VTU

Model  
Average frequency (Hz)
63 125 250 500 1000 2000 4000 8000
VTU100 21 16 9 11 9 8 8 12
VTU125 21 16 9 8 5 5 7 8
VTU160 19 13 9 6 5 4 6 8
VTU200 16 10 7 6 6 6 10 7
Tol. ± 6 3 2 2 2 2 2 3

 
VTI

Model  
Average frequency (Hz)
63 125 250 500 1000 2000 4000 8000
VTI100 22 17 11 9 8 9 6 9
VTI125 19 15 10 8 7 7 5 5
Tol. ± 6 3 2 2 2 2 2 3
Setting/Air volume

VTU


Valve fitted in
  Setting A (mm), see the dimensional drawing
   
VTU100
a  -12 -9 -5 0 5

   
Duct
90° bend
T-piece

k
0,560 0,938 1,46 2,00 2,72

   
0,632 1,02 1,44 2,20 2,78

   

1,08 1,54 2,17 2,91

   
VTU125 a -17 -15 -12 -9 -6 -3 0 5
Duct
90° bend
T-piece 

k
0,681 0,868 1,45 1,72 2,33 2,73 3,31 3,95  
0,616 0,854 1,40  1,86 2,35 2,75 3,11 4,01  
  1,13 1,56 1,97 2,39 3,00 3,40 4,19  
VTU160
a -20 -18 -15 -10 -5 0 6 10 12
Duct
90° bend 
T-piece

k
0,833 1,00 1,79 2,66 3,68 4,66 5,92 6,57 7,04
0,879 1,09 1,71 2,62 3,63 4,59 5,68 6,61 6,90
  1,58 2,11 3,09 3,90 4,90 6,10 6,86 7,11
VTU200
a -25 -20 -15 -10 -5 0 10 20  
Duct
90° bend
T-piece  

k
2,39 3,65 5,02 5,77 7,18 8,39 11,4 13,7  
2,39 3,54 4,87 5,70 7,01 8,51 11,1 13,6  
2,39 4,04 5,15 6,33 7,58 8,45 10,9 14,3  

VTI


Ø mm Valve fitted in
  Setting A (mm), see the dimensional drawing

VTI100


 Duct
a 2 4 6 9 12
1,00 1,10 2,31 3,19 4,12

VTI125


 Duct
a 3 5 7 9 12 15
k 1,23 1,85 2,83 3,74 5,08 6,21

 

Air volume calculation:

formel01

formel02

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