DataSheet VVKN202008
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| Diffusers
Design
Material used
The diffuser can be manufactured with a circular or a
square diffuser face made of galvanized steel. It is also
possible to manufacture from stainless steel AISI304 or
AISI316. The surface is powder-painted with a white RAL
9010 by default, other RAL types can be applied upon
request. In the diffuser’s center there is an opening for
mounting the diffuser face using a screw. Every VVKN
face includes a screw with a decrative white cap for its
mounting onto a plenum box as well as a self-adhering
seal, which needs to be placed onto the diffuser face
during the mounting.
Fig. 2: Diffuser types and shapes
Quick Selection
Tab. 1: Table for quick selection
Size
Type
A B
300 0,010 0,012
400 0,020 0,023
500 0,030 0,035
600 0,050 0,058
625 0,050 0,058
Size
øD A mø m□
(mm) (kg)
300 298 296 0,5 0,7
400 398 396 0,9 1,2
500 498 496 1,5 1,9
600 598 596 2,1 2,6
625 623 621 2,3 2,9
Tab. 2: Free area for diffuser faces A
V
(m
2
)
Tab. 3: Diffuser dimensions and weight
1000
900
800
700
600
500
400
300
200
100
m
3
/h
A B
Diffuser type
300
300
400
400
500
500
600/625
600/625
Dimensions
Fig. 3: Air ow inside the room
Technical Details
Terminology
L
t
A, B L
t
Y
H
1
H
H
0
= 1,8 m
V
H1
, ΔT
L
V
L
t
; ΔT
L
q
V
; ΔT
0
q
V
; ΔT
0
V
Lt
; ΔT
L
q
V
(m
3
•h
-1
) - Air ow volume per 1 diffuser
Y
(m) - Horizontal distance to the wall
H
(m) - Room height
H
1
(m) - Distance from the ceiling to the occupied zone
H
0
(m) - Occupied zone
L
t
(m)
- Throw distance: by the wall - L
t
= H
1
+ Y
between diffusers - L
t
= H
1
+ A/2
V
Lt
, V
H1
(m•s
-1
)
- Air velocity at throw distance L
t
, at distance H
1
∆T
0
(K)
- Temperature difference between the supply
and room air
∆T
L
(K)
- Difference between the airow core and room
air temperature
A, B
(m)
- Distance between diffusers by length and by width
of the room (A = distance between columns,
B = distance between rows)
Legend
□A
□A
A B
øD
øD
A B