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Starduct silencers & acoustic louvres

Silencer presentation: rectangular and circular duct silencers, acoustic louvres, materials, data basis, selection and installation.

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SILENCERS · ACOUSTIC LOUVRES

Starduct silencers & acoustic louvres

Rectangular and circular duct silencers and acoustic louvres — made at the Starduct factory, Hanoi.

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Made in Vietnam · Supplied to 17 markets

HVAC & M.E.P equipment manufacturer · Vietnam

AMCA · AHRI · ASHRAE · VISRAEMember of international and Vietnamese HVAC engineering associations
UL · FM · Intertek · IBST · VIBMRegular testing and certification with independent laboratories
5 patentsGranted in Vietnam
In-house aerodynamic test labPressure drop, airflow and leakage measured at the factory

“Vietnamese engineering can do it — and do it better.”

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Selected by octave band

SILENCERS · ACOUSTIC LOUVRES

Selected by octave band

Attenuation and pressure drop are calculated for each size and length by octave band; the quick selector suggests the smallest size that meets the required attenuation.

13silencer and acoustic louvre models
5rectangular and circular duct silencers
8acoustic louvres with straight, oval and V blades

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Noise control along the duct and through the façade

OVERVIEW

Noise control along the duct and through the façade

01Duct silencersAfter supply and return fans, AHUs, large FCUs · Meeting rooms, hotels, hospitals, studios, theatres · Ducts passing from noisy to quiet zones (cross-talk control)
02Acoustic louvresFresh-air intakes and exhausts of plant rooms, chillers, generators · Screens around rooftop plant, substations, cooling towers · Where natural ventilation is needed but noise to neighbours must be limited
03One document setCatalogue in five languages, declaration of performance (DoP) and submittal printed from the selector — all from the same calculation engine.

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DUCT SILENCERS

Rectangular and circular silencers

Rectangular splitter silencer S-RDs Rectangular splitter silencer W 450–2400 × H 300–2400 mm Calculated – not tested Rectangular lined silencer – internal lining S-RDi Rectangular lined silencer – internal lining W 300–1200 × H 300–1200 mm Calculated – not tested Rectangular lined silencer – external lining S-RDo Rectangular lined silencer – external lining W 300–1200 × H 300–1200 mm Calculated – not tested Circular silencer, 50 mm lining S-RC1 Circular silencer, 50 mm lining Ø 80–400 × L 300–1200 mm Calculated – not tested Circular silencer with centre pod S-RCP Circular silencer with centre pod 300×900 … 1500×3000 mm Calculated – not tested

Sizes from each model's data; sizes outside the range to project requirements.

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Splitters and lined casings

RECTANGULAR SILENCERS

Splitters and lined casings

01S-RDs — splitter silencerSplitters per standard layout table, W 450–2400 mm, open area 47–63 % · Strong attenuation at 500–2000 Hz
02S-RDi / S-RDo — linedFour-side lining, t = 50 / 100 / 150 mm · Casing size = duct size
03Pressure drop and self-noisePressure drop from airway velocity · Generated-noise data by velocity
04ConnectionsTDC, C or V30/40/50 flanges

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CIRCULAR SILENCERS

Lined and podded

S-RC1 — lined S-RC1 — lined Full-bore airway: very low pressure drop · High mid/high-frequency attenuation in small ducts · Light, fits directly in the duct run
S-RCP — with centre pod S-RCP — with centre pod D/2 pod adds low/mid-frequency attenuation · Suits axial fans · Round flange or C joint

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Duct silencer materials

MATERIALS

Duct silencer materials

01Outer casingGalvanised steel 1.2 mm, TDC or V flange
02Perforated facingGalvanised steel, Ø5 holes, 0.58 mm
03Acoustic infillMineral wool (rockwool) 80 kg/m³
04Anti-erosion facingBlack glass-fibre cloth 162 g/m²

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ACOUSTIC LOUVRES

Three blade types: straight, oval, V

Acoustic louvre, straight-blade, 150 mm deep, 50 mm blades S-LSt-150T50 Acoustic louvre, straight-blade, 150 mm deep, 50 mm blades W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, straight-blade, 300 mm deep, 50 mm blades S-LSt-300T50 Acoustic louvre, straight-blade, 300 mm deep, 50 mm blades W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, straight-blade, 300 mm deep, 100 mm blades S-LSt-300T100 Acoustic louvre, straight-blade, 300 mm deep, 100 mm blades W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, oval-blade, 250 mm deep S-LVo-250 Acoustic louvre, oval-blade, 250 mm deep W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, oval-blade, 500 mm deep S-LVo-500 Acoustic louvre, oval-blade, 500 mm deep W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, chevron (V) blade, 300 mm deep, 50 mm blades S-LVt-300T50 Acoustic louvre, chevron (V) blade, 300 mm deep, 50 mm blades W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, chevron (V) blade, 600 mm deep, 50 mm blades S-LVt-600T50 Acoustic louvre, chevron (V) blade, 600 mm deep, 50 mm blades W 300–1200 × H 300–2500 mm Calculated – not tested Acoustic louvre, chevron (V) blade, 600 mm deep, 100 mm blades S-LVt-600T100 Acoustic louvre, chevron (V) blade, 600 mm deep, 100 mm blades W 300–1200 × H 300–2500 mm Calculated – not tested

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Acoustic louvre construction

ACOUSTIC LOUVRES

Acoustic louvre construction

01Blade skinSolid top skin (rain lip); perforated 0.58 mm bottom skin (drain lip)
02ModulesModule up to 1200 × 2500 mm, combined for larger openings
03Frame and finishGalvanised, powder-coated or ZAM frame
04OptionsStainless insect screen (option)

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DATA BASIS

Calculated – not tested

Duct silencersAttenuation and pressure drop are calculated with ISO 7235 as the basis; S-RDi and S-RDo are cross-calculated from S-RDs.
Acoustic louvresPressure drop and free area use AMCA 500-L, transmission loss uses ISO 10140-2 as the calculation basis; S-LVt pressure drop awaits testing.
On every documentCatalogue, selector and submittal carry the label “Calculated – not tested”; the declaration of performance (DoP) states NPD for performance characteristics.
When test reports arriveMeasured values replace calculated ones in the catalogue, selector and DoP at the same time, because all documents share one engine.

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SELECTION & INSTALLATION

Four steps from noise target to installation

01Enter conditionsAirflow, duct or wall-opening size, and the attenuation needed per octave band.
02Choose the sizeThe quick selector suggests size and length; compare attenuation, pressure drop, velocity and self-noise.
03SubmitAdd to the project list, print the submittal with the DoP; export CSV / JSON for the BOQ.
04InstallSilencers are heavy: support them independently, respect the airflow direction and avoid flanking. Louvres fit into prepared wall openings; frames are fixed to the structure for wind load.

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CONTACT

Select, submit and order

Size units in the quick selector, download catalogues and DoPs from the product pages, and send your list for a quotation.

Emailkinhdoanh@nsca.vn
Phone(+84) 90 323 2222
FactoryDan Phuong Industrial Cluster Phase 2, Dan Phuong Commune, Hanoi City, Vietnam

Product pages Quick selector Test reports & certificates Request a quote

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