Air intake grille pitch 25 mm GVAN 25 pag. B-1 Description Air

Air intake grille pitch 25 mm GVAN
25
pag. B-1
Description
Air intake grille pitch 25 mm. Blades inclined to 45°,
mounted on plastic support to avoid noise phenomena caused by vibrations. Fixing through visible frontal
screws. Available in anodised (GVAN 25) and white
(GVAN 25 W) version. It’s commonly employed for environment air intake both in civil and industrial field.
Dimensions
B (mm) : 200 - 1500
H (mm) : 100 - 1000 (multiples of 25)
Construction
Anodised aluminium (GVAN 25), painted natural aluminium (GVAN 25 W).


Finish
Anodised aluminium (GVAN 25), white gloss RAL 9010,
powder-coated polyesther type (GVAN 25 W).
Other versions
GVAN 25 R : with anti-mouse mesh.
GPAN 25 : fixing through pressure springs.
GPAN 25 R : pressure springs with anti-mouse mesh.
GPAN 25 Q : for false ceilings with panel 595x595 mm.
GPAN 25 D3 : openable filter holder (pressure opening)
equipped with built-in frame and filter cell. Frame and
grille can be separated to make the installation easier.
GPAN 25 D3Q : openable filter holder for false ceilings
with panel 595x595 mm, equipped with built-in frame
and filter cell.
Accessories
CB1 : regulation damper.
CT : counterframe for GVAN 25.
CTP : counterframe for GPAN 25.
N.B. - Holes for fixing screws on long side.
3 holes if B > 600 mm, 4 holes if B > 1200 mm.




Specifications
Air intake grille pitch 25 mm. Anodised aluminium (GVAN
25) or white painted natural aluminium RAL 9010 (GVAN
25 W) construction. Inclined blades mounted on plastic
support to avoid any vibrations. Fixing through visible
screws.
GVAN 25
GPAN 25



GPAN 25 D3
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
15.07.15
Air intake grille pitch 25 mm GVAN
pag. B-2
1.40
0.90
0.50
0.30
0.20
0.14
0.09
0.06
0.02
0.03
40
0.04
Performances
Ak =0.01
3 m2
N.B. - GPAN 25 Q version must be installed on (resting)
reversed “T” false ceiling frame with panels 595x595
mm. Overall dimensions grille 595x595 mm.
25
35


LwA (dBA)
 
30
25
GPAN 25 Q
1
20
50
2000
1000
5000
0.50
0.30
0.20
0.14
0.09
0.06
0.04
qv (m3/h)
20000
10000
0.90
500
0.03
Ak =0.0
13 m 2
60
200
0.02
100
N.B. - GPAN 25 D3Q version must be installed with reversed “T” false ceiling frame positioned between frame
and filter holder grille, which must be properly separated,
through bars’ anchor screws unscrewing. Overall dimensions grille 595x595mm.
1.40

40

P (Pa)
30


20
 

2
10
100
 
GPAN 25 D3Q
200
300
500
1000
2000 3000
5000
qv (m /h)
3
20000
10000
1.5
1
0.5
BxH (m2)
0.3
0.2
0.1
0.05
0.03
3
0.02
0.01
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
0.02
0.03
0.05
0.1
0.2
Ak (m2)
15.07.15
0.3
0.5
1
1.4
Air intake grille pitch 25 mm GVAN
25
pag. B-3
40
Example
30
You must intake 1000 m3/h air from a room where the
allowed sound power level LWA is 25 dBA. You want to
select a grille with proper dimensions.
20
15
From first diagram you have : Ak = 0,14 m2
Pi (Pa)
10
8
From second diagram you have : DP = 25 Pa
6
From third diagram you find out that a grille with Ak =
0,14 m2, has BxH equal to about 0,18 m2 : you can use
for example a grille 600 x 300 mm.
4
2
4
1
0.1
0.2
0.4
0.6
0.8
vf (m/s)
1
1.2
1.6
2
2.5
3 3.5 4
Key to symbols
qv
Air-flow
LWA
Sound power level weighed “A”
(rif. 10-12 W)
DP
Grille’s pressure drop
Ak
Effective area
vf
Filter’s frontal velocity (GPAN 25 D3)
DPi
Air-flow calculation
It’s necessary to position the velocity probe to measure
vk as shown in the picture. You must employ hot-wire
anemometers taking care to orient the reading “window”
against the jet. In each point you must measure the average velocity in a breaktime of at least 1 minute (average
in time). In order to obtain the air-flow, you must calculate the arithmetic average of the so measured values (ṽ)
and multiply it for value Ak resulting from third diagram.
qv = ṽk x Ak

Filter’s initial pressure drop (GPAN 25 D3)
Selection
1 At the requested air-flow qv, with the allowed
sound power level LWA, from diagram 1 determine
(by excess) the effective area Ak of the grille.
2 At the requested air-flow qv, with value Ak given at
point 1, from diagram 2, verify that the pressure
drop DP is compatible with the plan’s value.
3 With value Ak given at point 1, from diagram 3,
determine the product BxH, therefore the grille’s
nominal dimensions B and H (setting for instance
B and getting H).
4 In case of openable filter holder grill GPAN 25 D3
it’s necessary to consider also pressure drops due
to filter. You can measure them from diagram 4
with vf as follows:
vf =
1000 * qv
3,6 * (B-50) * (H-50)
qv [m3/h], B[mm], H[mm], vf [m/s]
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
15.07.15