with adjustable gap
DTF - Flat perforated central disc circular diffusers 1-1.0-01.04-E-03/07
components for air-conditioning systems
Diffusers
DTF
DTF Flat perforated central disc circular diffusers with adjustable gap
Ve r s i o n s
- DTF (flat perforated central disc circular diffusers with adjustable gap)
The DTF series of circular diffusers with adjustable flat perforated panels has been designed for the radial
diffusion of air from the ceiling in rooms with a height of less than 3 m. The ability to adjust the height of
the perimeter gap allows the range of the air to be adjusted following any variations in the air pressure, in
this way avoiding annoying turbulence and unexpected downflows of cold air in the room. The adjustment
is made by the rotation of the lower circular plate that is connected to the external housing by means of
screws and brackets.
Quick reference selection table
315
200
100
40
700
300
80
70
200
60
50
40
100
30
90
80
70
20
Q [l/sm]
60
50
Q [m3/h]
30
400
NR 20
100
25 50 Pa
600
Δp 5 10
125
500
160
90
ØN [mm]
250
Q [m3/h]
Q [l/sm]
Legend
Q [m3/h] or [l/s]
ØN [mm]
Δp [Pa]
supply air flow rate
nominal dimensions of the diffuser
NR
pressure loss
noise rating (ISO standard, in relation to 10-12 W) taking no account of the
attenuation of the room
w w w. t e c n o v e n t i l . c o m
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
1
DTF
Diffusers
Dimensions
Section dimensions
ØN-2
10
C
10
D
ØA
3D Dimensions
ØN
ØA
ØB
C
D
100
224
200
70
17
125
259
235
70
17
160
320
290
90
20
200
360
330
90
20
250
450
400
100
30
315
535
490
100
30
Construction
The DTF series of diffusers is made of aluminium (external housing) and steel (adjustable
central plate), painted RAL 9010 white, and available in other colours on request.
2
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
DTF
Diffusers
Accessories
PS7-PSI7 plenum boxes
PS7-Standard plenum box made of Sendzimir zinc plated steel with side connection.
PSI7-Plenum box insulated with class 1 certified material (Ministerial Decree 26-6-1984 Article 8) made of Sendzimir zinc plated steel with side connection.
PS8-PSI8 plenum boxes
PS8-Standard plenum box made of Sendzimir zinc plated steel with top connection.
PSI8-Plenum box insulated with class 1 certified material (Ministerial Decree 26-6-1984 Article 8) made of Sendzimir zinc plated steel with top connection.
Plenum box dimensions
Plenum
PS7
PS8
Ø (mm)
BXH (mm)
S (mm)
ØC (mm)
ØN (mm)
Weight(kg)
BXH (mm)
S (mm)
ØC (mm)
ØN (mm)
Weight(kg)
100
225x225
150
98
102
1,5
225x225
200
98
102
2,5
125
250x250
150
98
127
2
250x250
200
98
127
2,5
160
285x285
175
123
162
2,5
285x285
200
123
162
2,5
200
325x325
210
158
202
3
325x325
200
158
202
3
250
375x375
250
198
252
4,5
375x375
200
198
252
3,5
315
440x440
300
248
317
6
440x440
200
248
317
4,5
w w w. t e c n o v e n t i l . c o m
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
3
DTF
Diffusers
SF – butterfly calibration damper
Butterfly calibration damper made of Sendzimir zinc plated steel
Technical data
Adjustment of the central plate
The effective outlet area values S shown on the following page relate to a perimeter gap height d= 10
mm. For other values of d, the value S must be multiplied by an appropriate coefficient, shown in the
following table (K= d / 10):
d (mm)
K
5
0,5
10
1
15
1,5
20
2
d
Warning: the effective outlet area of DTPs vary markedly with the height of the plate d. For a given air
pressure a diffuser with a larger aperture d may return lower pressure loss and noise level values than
one with a nominally greater diameter.
4
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
Diffusers
DTF
Effective outlet area (m2) and weights (kg)
The effective outlet area is a notional area that, once the velocity of the air is known, makes it possible to arrive at the rate of
flow that is actually passing through the diffuser. The measurement is carried out with an instrument that measures the velocity
of the air at various points across the diffuser. The formula that
links the various parameters is as follows:
dove
Q = vk x S x 3600
[m3/h]
Q = supply air flow rate
vk = average measured velocity [m/s]
S = effective outlet area [m2]
ØN [mm]
100
125
160
200
250
315
S [m ]
● 0,0048
● 0,0059
● 0,0074
● 0,0091
● 0,0111
● 0,0138
2
ØN [mm]
100
125
160
200
250
315
[kg]
0,33
0,42
0,64
0,75
1,1
1,45
Weights
● Standard sizes available from stock
For the variations of effective outlet area S with changes in height d see page 4
15
50
00
0,0
33
25
20
0,0
0,0
0,0
17
>>
3
>>
2
0,0
14
60
>>
2
09
0,0
11
25
>>
1
0,0
0,0
07
>>
1
>>
1
06
0,0
0,0
05
2
04
03
0,0
02
0,0
0,0
S [m2]
150
5
ØN [mm]
00
Pr e s s u r e l o s s a n d n o i s e l e v e l s
ρ = 1,2 kg/m3
100
90
80
70
60
10
50
8
30
40
7
20
vK [m/s]
Δp [Pa]
9
45
40
6
35
5
4
7
Legend
2000
500
400
300
1000
900
800
700
200
600
400
100
300
90
80
70
60
200
50
40
90
100
30
80
60
50
70
20
Q [l/s]
25
20
5
500
6
Q [m3/h]
NR
30
10
9
8
Q [m3/h]
Q [l/s]
Q [m3/h]
supply air flow rate
ØN [mm]
nominal diameter of the diffuser
S [m ]
effective outlet area
vk [m/s]
velocity relating to the effective outlet area S
Δp [Pa]
total pressure loss
NR
noise rating (ISO standard, in relation to 10-12 W) taking no account of the attenuation of the room
2
w w w. t e c n o v e n t i l . c o m
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
5
DTF
Diffusers
02
5
0,0
0
0,0 32
04
0,0
0
0,0 5 >>
06
10
>> 0
0,0
12
0
5
0,0 7 >
>1
0
0,0 9 > 60
>
11
2
>> 00
0,0
25
1
0
0,0 4 >
>3
1
15
0,0 7
20
0,0
25
0,0
33
Horizontal throws
S [m2]
8
0,0
ØN [mm]
7
6
5
4
3
2
1
5
L0,2 [m]
D [m]
4
3
2
1
0,9
0,8
0,7
0,6
-10 °C
3
2,5
2
1,5
1
0,5
2000
500
600
700
800
900
1000
400
300
200
60
70
80
90
100
50
40
500
200
0
60
70
80
90
100
0,5
50
1
40
1,5
0
30
2
0,5
20
2,5
1
9
10
1,5
30
2
0 °C
ρ = 1,2 kg/m3
0,5
400
+10 °C
300
ΔT
Q [m3/h]
Q [l/s]
0
y [m]
Legend
Q [m3/h] or [l/s]
supply air flow rate
ØN [mm]
diameter of the diffuser
S [m2]
effective outlet area
vm [m/s]
average velocity of the throw at distance L
L [m]
diffusion radius (= x + y)
x [m]
horizontal dimension of the throw
y [m]
vertical dimension of the throw
L0,2 [m]
throw with terminal velocity of 0.2 m/s
D [m]
distance between two diffusers
ΔT [°C]
difference between supply air temperature and ambient temperature
L
D
L
x
vm
y
y
vm
vm
H
1,80
OCCUPIED ZONE
ZONA
OCCUPATA
The average throw velocity L0.2 at a distance x other than that indicated in the diagrams is obtained by using
the following formula: vx = 0.2 x (L0.2 / x)
The values shown in the diagram relate to a throw with ceiling influence. For free jet throws, the values relative to the throws are multiplied by a coefficient of 0.7.
6
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
Diffusers
DTF
Fixing systems
Mounting with self-tapping screws on the diffuser collar
sospensione a
cura del cliente
sospensione a
cura del cliente
viti
autoforanti
The removal of the lower plate enables the regulating damper to be adjusted from below and for hidden
fixing to be carried out.
w w w. t e c n o v e n t i l . c o m
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
7
DTF
8
Diffusers
VER. 03/12/09
We reserve the right to make any modifications without prior notice.
w w w. t e c n o v e n t i l . c o m
components for air-conditioning systems
tecno-ventil s.p.a.
Via Parma, 2
2 6 0 1 6 S p i n o d ’A d d a ( C R )
Te l . + 3 9 0 3 7 3 . 9 8 0 4 5 6
Fa x + 3 9 0 3 7 3 . 9 8 0 6 8 1
w w w. t e c n ove n t i l . c o m
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