Dual stage Performance louvre system type C/S MODEL RS7305a
Suitable for use with C/S Models 3105 (single stage) and LSM (triple stage) systems
PERFORMANCE LOUVRE SPECIFICATION (Dual stage louvres – Hidden mullion system)
LOUVRE DESCRIPTION GENERAL
1.0 QUALITY
a) The system shall be used for ‘exposed’ locations to deal with aerodynamic airflow,
rain defence and aesthetic appearance to suit the requirements of the architect.
b) The supplier of the louvre system shall have a substantial track record in Asia-Pacific
Region, of not less than 10 years, in the design and application of performance
louvre systems in applications with similar weather conditions to Sydney and tested
to the standards listed in this specification. A detailed reference list will be required
at the point of tender.
c) The supplier of the louvre system shall perform work in accordance with recognized
International Quality Assurance Standards, such as Quality Standard Type AS/NZS
ISO 9001:2000, for Australia based operations.
d) To ensure direct support of the Specifier (and installer), the supplier of the system
must be directly represented with their own office and operations locally within
Australia. <in Sydney, in Melbourne>
e) The supplier of the louvre system shall co-ordinate with the main-contractor to
ensure the manufacturer, supply and installation of louvre system is fully integrated
with the architectural finishes where the coordination with curtain walling system
and architectural finishes is required.
2.0 SUBMITTALS
a) Product Data detailing the following must be supplied at the tender stage:
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Maximum mullion spacing
Blade spacing
Blade and framing material thickness
Material specification
Finishing specification
b) Product Data describing design characteristics, maximum recommended air
velocity, design free area, materials and finishes along with a sample of a finished
louvre panel, minimum size 400mm x 400mm, must be supplied at the bid stage.
c) Copies of the relevant Rain and Air performance test certification, applicable to
AS/NZS 4740:2000 test procedures must be submitted for approval, along with bid
documents.
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3.0 PERFORMANCE REQUIREMENTS
a) The specialist louvre system shall provide high airflow at low-pressure drop with
suitable rain defence.
b) The louvre system shall be aerodynamically designed to provide minimum restriction
to airflow, low velocity and shall have the following minimum inlet and outlet
coefficient values:
Louvre Type
Dual Stage RS7305a
Inlet
0.31
Exhaust
0.32
c) The above coefficients shall only be established as a result of full scale wind tunnel
tests carried out by an AS/NZS 4740:2000 accredited test facility on a louvre panel
measuring not less than 1m by 1m, to limit the influence of edge effects.
d) From AS/NZS 4740:2000 test results the performance of the louvre system to meet the
needs of the mechanical plant requirements shall be:
Airflow (m3/s)
Classification
0.0
A
0.5
A
1.0
A
1.5
B
2.0
C
2.5
C
e) Frame sills and support members shall be detailed such that they impose the
minimum restrictions to the opening provided by the louvre system.
f) The louvre design shall impose a pressure drop of not more than 40 Pa when
subjected to an airflow velocity of 2.5 m/s and tested in accordance with AS/NZS
4740:2000 Wind Driven Rain Penetration test.
g) With a test wind speed of not less than 13m/s and a rainfall rate of 75mm/hr, the
‘rain defence effectiveness’ for the individual louvres at an airflow rate from 0 to 3.0
m3/s shall equal of better than 99.82% to 87.67% with a Percentage Free Area of
48.8% or better.
h) To prevent flooding of louvre system, water drainage from blades to sill shall take
place via pre-formed extruded mullions and jambs with built in integral drain
channels. The sill shall include a rear upturn profile to prevent rainwater being driven
back off the sill.
i)
All components and fixings of the louvre system, in conjunction with the frame
support steelwork, shall be capable of withstanding the design wind load, consistent
with that being used in designing the building/curtain walling system.
4.0 REFERENCES
a) AS/NZS 4740:2000 “Natural ventilators - Classification and performance”
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5.0 ARCHITECTURAL
a) Full sets of shop drawings, and samples shall be submitted to the Architect for
approval prior to manufacturing.
b) Louvre panels shall be fabricated to give a continuous horizontal line effect
throughout the length of the panel, with louvre blades supported by hidden
mullions.
c) Louvre blades shall be attached to vertical mullions without surface drilling or
riveting and shall remain horizontal with equal spacing at all times irrespective of
ambient temperature. All louvre hardware shall be stainless steel screws. Rivets shall
not be used as a method of joining any part of the louvre system or the louvre
components.
d) Water tightness of all jointing components in the system and joints between panels
shall be maintained with the use of preformed gaskets to a suitable material. The
use of any kind of ‘wet’ or gunned sealant to seal components or the joints between
panels (except in the caulking of the unit to the support structure) shall not be
permitted.
e) The louvre system should be capable of being installed horizontally (allowing
downward flow discharge) or inverted (allowing upward flow discharge).
f)
All the louvre frames, external and internal louvre blades and mullions shall be fully
finished in the specified finish and approved colour.
g) The louvre system shall be partial paint finish, where all external visible components
shall be coated to the approved finish. And all internal non-visible components shall
be with the alternative finish.
6.0 MANUFACTURERS
The Louvre System specified herein and indicated on drawings, shall be manufactured
by Construction Specialties Group (C/S Group):
Construction Specialties Australia Pty. Ltd.
Unit 6. 26-32 Cosgrove Road, Enfield 2136
Telephone : 1300 272 602
Fax: 1300 247 407
Web: www.c-sgroup.com.au
Email: sales@c-sgroup.com.au
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7.0 CONSTRUCTION
All Louvres, mullions, frames, blades braces and associated components shall be
manufactured from aluminium grade 6063–T5.
a) With the exception of fixing hardware, all components are to be manufactured from
extruded aluminium. To avoid problems with poor blade rigidity and twisting of
blades between supports. Use of components (blades, frames, louvre supports, etc)
manufactured from sheet or coil materials will not be permitted.
b) The entire louvre system should be designed to withstand a typical wind load of 1.5
kPa.
c) Louvre blades shall be set at 45 degrees with the pitch between blades set at 75
mm. Each blade shall incorporate a continuous flat front or bull nose edge design
together with a rear up turn edge designed to prevent water migration through the
blades. The front blades shall be installed via blade braces fastened to the support
mullions with stainless steel screws. (Note: pop rivets are not allowed for any
fasteners). Louvre blades shall be capable of spanning up to 1.5 meters between
supports, taking into consideration the design wind load conditions.
d) Front louvre blades for type C/S 7305a consist of extruded aluminium horizontally
mounted front blade of 75mm depth and 75mm pitch, to a nominal minimum blade
thickness of 1.5mm. Louvre blades are to be fixed to support mullions with purpose
made extruded aluminium blade clips that will allow expansion and contraction to
suit environment conditions. Fixing clips shall be extruded (not fabricated from sheet
metal) to ensure consistency in profile.
e) Rear mounted performance modules consist of single piece blades mounted at
75mm pitch and secured into drained louvre frame 75mm deep, to a nominal
minimum blade thickness of 1.5mm, complete with extruded aluminium blade braces
for application of front blades. Internal louvres shall be separated from front external
blades with designed air gaps to ensure water separation by tangential separation.
f) All louver frames, sills, mullions, jambs and supports must be manufactured from a
minimum of 2mm thick extruded aluminium, to prevent deformation during
installation.
g) All bolts and fixings shall be 300 grade stainless steel to suit designed functions and
with appropriate isolation device to prevent any possible bimetallic action.
h) Louvre doors shall comprise single or double leaf arrangements to incorporate the
specialist louvre panels as previously described, including door frame hinges and
hardware all to be mounted in prepared jambs.
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11.0 INSTALLATION
a) The louvre system shall be suitable for easy site application. Rear performance
modules shall be supplied fully assembled with maximum width of 1.5 meters
together with front blades supplied cut to length.
b) Smaller panels may be supplied as factory built modules, as an option.
c) The construction of the louvre system shall take account of the requirement for
installation on site by a local approved applicator. The louvre manufacturer must
provide the option for directly employed, locally available and suitably trained
personal for site advice to ensure correct application and quality of work.
12.0 Warranty
a) Louver panels shall be warrantied for a minimum period of 5 years. Terms of
warranty shall be as per manufacturers advice.
Specification ends:
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