AIRTECHNIC G1S Return Grille Owner’s Manual
- June 22, 2024
- AIRTECHNIC
Table of Contents
AIRTECHNIC G1S Return Grille
Specifications
- Model: G1S
- Material Options: Anodized aluminium, aluminium painted in RAL color, galvanized steel, stainless steel, copper
- Installation Options: Visible installation with screws, Concealed installation with -shaped subframe
Product Usage Instructions:
Product Description
The Return Grille G1S features 1 row of fixed blades, 45° inclined,
suitable for air-conditioning and ventilation systems. It is designed for
wall, roof, or air-duct placement for indoor air exhaust.
Material Options
The G1S grilles can be manufactured from anodized aluminium, aluminium
painted in RAL color, galvanized or stainless steel, and copper.
Installation Options
- Visible Installation with Screws:
- For easy, quick, and secure installation.
- The number of screws required depends on the size of the grille.
- Bigger grilles require a greater number of screws.
- Concealed Installation with -Shaped Subframe:
- For aesthetically better results and secure installation.
- A -shaped frame is mounted in the installation hole with visible screws for support.
- The grille is secured on the frame using an internal screw accessible through the front face of the grille.
FAQ
-
Q: What are the optional accessories available for the G1S grilles?
A: Under request, optional accessories include plenum box, aluminum, galvanized or stainless steel grid for protection against insects and leaves, G2 aluminum filter washable, G4 filter, perforated metal sheet, and false ceiling plate with external dimensions 595 x 595 mm. -
Q: Can G1S grilles be manufactured from PVC plastic?
A: Yes, G1S grilles can be manufactured from PVC plastic under special request.
Return grille
Return grilles G1S have 1 row of fixed blades, 45⁰ inclined, parallel to the
1st dimension. They are suitable for use in air-conditioning and ventilation
systems and wall, roof or air-duct placement, for indoor air exhaust.
Return grilles G1S can be manufactured from anodized aluminium, aluminium
painted in RAL color, from galvanized or stainless steel and copper:
- G1S… : Blades & frame from anodized aluminium or aluminium painted in RAL color.
- G1S… | C : Blades & frame from copper.
- G1S… | GL : Blades & frame from galvanized steel.
- G1S… | I : Blades & frame from stainless steel.
It is possible to manufacture G1S grilles from PVC plastic, under request.
RETURN GRILLE G1S – TYPES
- G1S From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension.
- G1S+D From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. With volume damper.
- G1S.Α From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. Accessible.
- G1S.Α+D From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. Accessible with volume damper.
- G1S+F From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. With G3 filter.
- G1S.A+F From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. Accessible with G3 filter.
- G1S+D+F From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. With G3 filter and volume damper.
- G1S.A+D+F From aluminium. 1 Row of fixed blades, 45⁰ inclined, parallel to the 1st dimension. Accessible with G3 filter and volume damper.
OPTIONAL ACCESSORIES
Under request, return grilles G1S can have plenum box, aluminium, galvanized
or stainless steel grid for protection against insects and leaves, G2
aluminium filter washable, G4 filter, perforated metal sheet and false ceiling
plate with external dimensions 595 x 595 mm.
INSTALLATION OPTIONS
Return grilles G1S can be installed with the following ways :
-
Visible installation with screws
For easy, quick and secure installation. The number of screws required depends on the size of the grille. Bigger grilles require greater number of screws. In case the grille is extremely big, it can be fragmented according to specifications. For all G1S types. -
Concealed installation with springs
For situations that require an aesthetically better result. Laminas with special cavities, are placed inside the opening where the grille is to be installed, while springs are placed on the grille’s frame. The support of the grille is achieved when the springs are secured inside the special cavities of the laminas. This installation method is suitable only for wall installation and not for ceiling installation, for security reasons. Not used for accessible return grilles G1S.A. -
Concealed installation with Π-shaped subframe
For situations that require both an aesthetically better result and a secure installation. A Π-shaped frame is mounted in the hole in which the grille is to be installed and supported by visible screws. The grille is secured on the frame with internal screw located at the back of the grille. This screw is accessible by screwdriver through the front face of the grille. Not used for accessible return grilles G1S.A. -
Concealed installation with internal screws at the side of the grille
For accessible return grilles G1S.A that require both an aesthetically better result and a secure installation. The grille is secured in the hole with internal screws placed in both sides of the grilles. The screws are accessible through the accessible face of the grille.
Installation options
G1S – SIZE SELECTION
The selection of return grilles G1S & G1S.A will be made using the following
diagrams and in accordance with the guideline CR 1752:1998 (Ventilation for
buildings – Design criteria for the indoor environment).
The technical specifications for return grilles G1S and G1S.A are the
following :
Selection example 1 :
Which are the dimensions of a G1S grille if the air flow is 1.800 m3/h and the
installation is in an office building?
The G1S grille will be installed in an office. From the guideline CR 1752:1998
(types of spaces & permissible sound pressure levels) we establish that the
maximum permissible noise level must be 30 dB(A). Therefore a produced noise
level of 25 dB(A) is acceptable and from diagram 1.3, for air flow of 1.800
m3/h, we determine that the surface factor Af is 22,1. If one dimension, for
construction reasons, is 450 mm then from the surface factor Af selection
table we have that for grille height equal to 450 mm the grille width must be
650 mm. The maximum air velocity inside the grille 650 x 450, is estimated
from diagram 1.1 and it’s equal to 2,9 m/s, while from diagram 1.2 we
calculate that the pressure drop is 8,6 Pa.
Selection example 2 :
Which is the pressure drop and the produced noise level in a G1S grille 850 x
550 mm, if the airflow is 2.700 m3/h?
From the surface factor Af selection table we establish that according to the
grille’s dimensions the surface factor Af is equal to 35,7. From diagrams 1.1,
1.2 and 1.3, for air flow of 2.700 m3/h and surface factor Af of 35,7 we
estimate that the maximum air velocity inside the louvre is 2,7 m/s, the
pressure drop is 7 Pa and the produced noise level is 23,4 dB(A).
The diagrams are an approximate selection method for G1S grilles. For more precise calculation, please use the AIRTECHNIC air grilles calculation software or contact us.
The standard dimensions of return grilles G1S are listed in the following surface factor selection table, but it is possible to manufacture G1S grilles in any dimension, under request.
G1S & G1S.A – PRESSURE DROP & NOISE LEVEL CALCULATION
PRESSURE DROP & NOISE LEVEL – RETURN GRILLE WITH VOLUME DAMPER
If we have a return grille with volume damper G1S+D, the calculation of the
total pressure drop and noise level is made using the G1S calculation diagrams
(as shown on page 5), the grille volume damper calculation diagrams (as listed
in their respective technical document) and the following equations.
Calculation example 1 :
Pressure drop and noise level calculation in a G1S+D, with damper blade angle
of 0⁰.
We have a grille G1S+D with dimensions 400 x 400 and an air flow of 1.000
m3/h. The grille G1S+D with dimensions 400 x 400 has, according to page 5
diagrams, for air flow equal to 1.000 m3/h, pressure drop of 10 Pa and a noise
level of 26,5 dB. A grille damper with dimensions 400 x 400 has, according
it’s respective selection diagrams, for blade angle 0⁰ and air flow of 1.000
m3/h, a pressure drop of 4,8 Pa and a noise level of 16,7 dB.
The total pressure drop inside the grille G1S+D with dimensions 400 x 400 is
the algebraic sum of the pressure drop inside the grille and the pressure drop
inside the damper: ΔpG1S + ΔpDamper = 10 + 4,8 = 14,8 Pa.
The total noise level is calculated by using the following equation: Ltot =
LG1S ⊕ LDamper = Lmax + C(ΔL). The difference between the noise levels of the
2 independent sound sources (the grille G1S and the damper) is ΔL = 9,8.
Therefore from the following diagram we determine that for ΔL = 9,8 the
correction factor C(ΔL) is equal to 0,6. So, the total noise level is Ltot =
Lmax + C(ΔL) = 26,5 + 0,6 = 27,1 dB.
Calculation example 2 :
Pressure drop and noise level calculation in a G1S+D, with damper blade angle
of 30⁰.
We have a grille G1S+D with dimensions 400 x 400 and an air flow of 1.000
m3/h. The grille G1S+D with dimensions 400 x 400 has, according to page 5
diagrams, for air flow equal to 1.000 m3/h, pressure drop of 10 Pa and a noise
level of 26,5 dB. A grille damper with dimensions 400 x 400 has, according
it’s respective selection diagrams, for blade angle 30⁰ and air flow of 1.000
m3/h, a pressure drop of 27,3 Pa and a noise level of 32,7 dB.
The total pressure drop inside the grille G1S+D with dimensions 400 x 400 is
the algebraic sum of the pressure drop inside the grille and the pressure drop
inside the damper: ΔpG1S + ΔpDamper = 10 + 27,3 = 37,3 Pa.
The total noise level is calculated by using the following equation: Ltot =
LG1S ⊕ LDamper = Lmax + C(ΔL). The difference between the noise levels of the
2 independent sound sources (the grille G1S and the damper) is ΔL = 6,2.
Therefore from the following diagram we determine that for ΔL = 6,2 the
correction factor C(ΔL) is equal to 1,0. So, the total noise level is Ltot =
Lmax + C(ΔL) = 32,7 + 1,0 = 33,7 dB.
CALCULATING THE TOTAL NOISE LEVEL BETWEEN 2 INDEPENDENT SOUND SOURCES
Since noise in [dB] is a quantity that is defined in logarithmic scale, when
we have 2 (or more) independent sound sources, the
total noise is not calculated by the algebraic sum of the 2 sources. The “sum”
of 2 sound sources L1, L2 is symbolized by the
internationaly defined symbol ⊕ and is calculated by using the following
equation :
Ltot = L1 ⊕ L2 = 10 x log(100,1 x L1 + 100,1 x L2)
Because of the previous equation requiring some complex calculations, we can
define the sum of 2 sound sources with sufficient
accuracy using the following approximate equation :
Ltot = L1 ⊕ L2 = Lmax + C(ΔL),
where Lmax is the largest noise level between L1 and L2 and C(ΔL) a correction
factor (in dB) which depends on the difference ΔL
= | L2 – L1 | and is calculated by using the following diagram.
G1S – ORDER
CODIFICATION
For the proper order of return grilles G1S please use the following
codification :
Examples
G1S.A 800 x 400 + F =
Return grille G1S.Α accessible, 800 mm in width, 400 mm in height, with blades
and frame from aluminium and filter.
G1S 600 x 400 +PL.Α (Ø150) | 7040 =
Return grille G1S, 600 mm in width, 400 mm in height, blades and frame from
aluminium powder painted in RAL 7040 and type Α plenum box for connection with
flexible air-duct 150 mm in diameter.
For ordering G1S grilles with optional accessories not listed in the standard
codes above or special constructions please contact our sales department.
SPECIFICATIONS
Single row grille with fixed blades, G1S
Rectangular exhaust grille, indicative type G1S of AIRTECHNIC, manufactured of
anodized aluminum / aluminum painted in RAL… color / copper / galvanized steel
/ stainless steel and 1 row of fixed blades inclined at 45°, parallel to the
1st dimension. The manufacturer will have performed measurements of the
technical characteristics of the grille, in an independent laboratory
according to the standard ELOT EN 12238: 2002. It will have a volume damper
[D] / filter G3 [F] / protection grid [G] / plenum box type A/B [PL(A/B)]. It
will be suitable for wall, ceiling or air duct placement and visible
installation with screws / concealed installation with springs / concealed
installation with Π-shaped subframe. The factory will be certified according
to ISO 9001:2015 (Quality Management Systems) and according to ISO 14001:2015
(Environmental Management Systems).
It will be manufactured by AIRTECHNIC type G1S / G1S +D, +F, +G, +PL(A/B).
Single row grille with fixed blades – accessible, G1S.A
Rectangular return grille, indicative type G1S.A of AIRTECHNIC, manufactured
of anodized aluminum / aluminum painted in RAL… color / copper / galvanized
steel / stainless steel, 1 row of fixed blades inclined at 45°, parallel to
the 1st dimension and accessible face. The manufacturer will have performed
measurements of the technical characteristics of the grille, in an independent
laboratory according to the standard ELOT EN 12238: 2002. It will have a
volume damper [D] / filter G3 [F] / protection grid [G] / plenum box type A/B
[PL(A/B)]. It will be suitable for wall, ceiling or air duct placement and
visible installation with screws / concealed installation with internal
screws, on the side of the outer frame. The factory will be certified
according to ISO 9001:2015 (Quality Management Systems) and according to ISO
14001:2015 (Environmental Management Systems).
It will be manufactured by AIRTECHNIC type G1S.A / G1S.A +D, +F, +G, +PL(A/B).
ΕΔΡΑ – ΑΘΗΝΑ Παπαρρηγοπούλου 10 & Λαγκαδά, τ.κ.: 12132, Περιστέρι, Αθήνα
211 – 70.55.500 [email protected]
ΕΡΓΟΣΤΑΣΙΟ – ΘΗΒΑ 4ο χλμ. Θήβας – Χαλκίδας, τ.κ.: 32200, Θήβα 22620 –
89.006 [email protected]
ΕΡΓΟΣΤΑΣΙΟ – ΘΕΣΣΑΛΟΝΙΚΗ Τέρμα προέκτασης Μαιάνδρου, τ.κ.: 57013,
Ωραιόκαστρο Θεσ/νίκη 2311 – 82.40.00
[email protected]