Volume control dampers (VCD)

VCD · VOLUME CONTROL DAMPERS

Balancing and airflow control dampers made at the Starduct factory, Hanoi. SVCD leakage per VIBM test reports; SVCD-HP tested in the Starduct laboratory.

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Made in the Starduct factory, tested by independent laboratories

Made in Vietnam · Supplied to 17 markets

Made in the Starduct factory, tested by independent laboratories

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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Starduct VCDs: every figure marked measured or calculated

VCD · VOLUME CONTROL DAMPERS

Starduct VCDs: every figure marked measured or calculated

SVCD has VIBM leakage test reports to BS EN 1751; SVCD-HP is being tested by the AMCA 500-D-18 method in the Starduct laboratory; the other models are calculated.

6models: rectangular, round, airtight, pressure relief and non-return

2VIBM leakage test reports to BS EN 1751 (SVCD)

5SVCD-HP specimens on the AMCA 500-D-18 test plan in the Starduct laboratory

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Balance every branch, shut tight when needed

OVERVIEW

Balance every branch, shut tight when needed

01Airflow balancingBalances and distributes airflow between rectangular duct branches in low-pressure ventilation and air-conditioning systems.

02Airtight dampers for medium and high pressureHeavy-gauge dampers for medium- and high-pressure ductwork that needs tight shut-off: fresh air, smoke extract, cleanroom systems and fan discharge mains.

03Made in Dan PhuongAll parts are made on Starduct’s production lines in Dan Phuong, Hanoi. Large sizes are assembled from 1000 × 1200 mm modules, each with its own shafts and linkage.

04OperationChoose the operator by duty: set once by hand during balancing, or controlled from the BMS by an actuator.

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MODELS

Rectangular, round, airtight, pressure relief and non-return

SVCD Standard VCD – Standard rectangular VCD with triple-V blades W 100–1000 × H 100–1200 mm

SVCD-MP Airtight VCD, medium pressure – Medium- and high-pressure airtight VCD with V-hook blades W 200–5100 × H 200–2000 mm

SVCD-HP Airtight VCD, high pressure – Medium- and high-pressure airtight VCD with V-hook blades W 200–5100 × H 200–2000 mm

SVCD-T Round VCD – Single-blade round VCD for circular ducts Ø 100–500 mm

SPRD Pressure relief damper – Counterweighted relief damper with adjustable opening pressure W 200–1200 × H 350–2000 mm

SNRD Non-return damper – Gravity-blade backdraft damper W 200–1600 × H 200–1600 mm

SVCD: leakage per VIBM test reports. SVCD-HP: measured in the Starduct laboratory, not certified. SVCD-MP, SVCD-T, SPRD, SNRD: calculated – not tested.

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Standard rectangular VCD with triple-V blades

SVCD CONSTRUCTION

Standard rectangular VCD with triple-V blades

01CasingGalvanised steel 180 g/m² (JIS G3302 / ASTM A653), 0.75–1.5 mm; C-channel with integral flange (low/medium pressure) or hat profile (medium/high)

02BladesGalvanised 0.75 mm (up to 1.5 mm on large sizes), triple-V, 220 mm wide, 150 mm pitch, overlapping; max. 900 mm long per the 2026 LP drawing

03ShaftGalvanised CT4 steel, 10 × 10 square or 10 hex · PPP plastic (standard), brass or ball bearing

04LinkageSteel linkage, parallel or opposed action; inside or outside the casing

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BLADES

Blade profiles compared

SVCD — triple-V blade Standard SVCD: overlap blade, square shaft, t = 0.75 mm

SVCD-MP / SVCD-HP — V-hook blade SVCD-MP / HP: airtight blade, round shaft, interlock hook, t = 1.15–1.6 mm

Opposed blades for control, parallel for shut-off; choose the operator and the flange type.

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Medium- and high-pressure airtight VCD with V-hook blades

AIRTIGHT SVCD-MP / SVCD-HP

Medium- and high-pressure airtight VCD with V-hook blades

01V-hook bladesInterlocking edges with edge seals

02Stainless end capsReduce leakage at blade ends and shafts

03Multi-bayEach bay narrower than 850 mm in one frame

04≈ 60 %Closed-blade leakage of 914 × 914 vs the Class 2 limit in the AMCA 511 table, 250–1500 Pa (in-house, not certified)

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Starduct laboratory, Dan Phuong — specimen test duct

MEASURED & CALCULATED

Every figure states its source

01SVCD — VIBM test reportsCasing and blade leakage: VIBM reports 10131 and 10132 (2017). Free area: smoothed from the Starduct 2023 table. Pressure drop: calculated from free area, not tested to AMCA 500-D. The airtight high-pressure range has its own catalogue, SVCD-MP / SVCD-HP.

02SVCD-HP — Starduct laboratoryClosed-blade leakage: in-house measurement on the SVCD-HP 914 × 914 specimen to the ANSI/AMCA 500-D-18 method; other sizes and SVCD-MP are calculated from it. Comparison with the AMCA 511 table limits is for reference only – not AMCA certified, no AMCA seal. Casing leakage, pressure drop and Cd: no results yet.

03SVCD-MPClosed-blade leakage calculated from the SVCD-HP measurements – not tested.

04SVCD-T · SPRD · SNRDCalculated from aerodynamic theory – not tested.

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TESTING

VIBM leakage test reports to BS EN 1751

BS EN 1751:1999Casing and closed-blade leakage tested to BS EN 1751:1999 at the Vietnam Institute for Building Materials (VIBM), reports 10131 and 10132 dated 10 Oct 2017. Free area and pressure drop: design data, not tested to AMCA 500-D or ISO 5801.

VIBM test reports SVCD 10131 (2017), 10132 (2017) …/VLXD-TBMT

ISO 9001 · ISO 14001ISO 9001:2015 (VN-10161-QMS) · ISO 14001:2015 (VN-10038-EMS).

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OPERATORS

Worm-screw handle, lever or Belimo actuator

Worm-screw handle Stepless adjustment that holds the blade position after balancing.

90° lever Quick manual open / close with a position lock.

Belimo actuator Controlled from the BMS, on/off or modulating; Starduct sizes the torque for the damper area and pressure.

Bays within one frame are linked so one operator drives the whole damper.

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Large dampers split into sections in one frame

Example W 2200 × H 1000: 3 bays of 732.5 mm, 7 blades at 150 pitch, one actuator

LARGE DAMPERS

Large dampers split into sections in one frame

01Modules for large sizesModules are joined with M8 × 25 bolts and gap covers fixed with M5 × 20 self-drilling screws at ≤ 600 mm pitch. Motorised dampers have one actuator per module.

02Bay width< 850 mm; larger W split evenly into n bays

03Linkage and multi-bayLinkage inside the frame (compact) or outside (easier service).

04Blade pitch150 mm (standard) or 200 mm

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APPLICATIONS

From branch balancing to cleanrooms

Branch balancingBalancing supply, return and fresh-air branches

Modulating controlModulating control with 0–10 V actuator

Around equipmentBefore or after AHUs, FCUs, fans and plenums

Fresh and exhaust airFresh-air and exhaust ducts that must seal when the system stops

Smoke extract, pressurisationSmoke extract and pressurisation systems (control damper, not a fire damper)

CleanroomsCleanrooms, pharma and electronics plants – zone isolation

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SELECTING A DAMPER

Four steps to select a VCD

01Airflow & duct sizeTake the branch airflow Q and duct size W × H; keep face velocity ≤ 8 m/s on mains and ≤ 6 m/s on noise-sensitive branches.

02Pressure dropLook up the fully-open pressure drop and add it to the branch resistance for fan selection.

03Blades & operatorOpposed blades for control, parallel for shut-off; choose the operator and the flange type.

04Closed leakageCheck closed leakage at working pressure; if tighter shut-off is needed, choose SVCD-MP / SVCD-HP.

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INSTALLATION & SUPPORT

Install the right way round, submit the full file

Airflow and operator sideState the airflow direction and the operator side (viewed in the airflow direction).

Check on installationCheck the full 90° stroke and that all blade hooks engage when closed.

Quick selectorCalculates face velocity, pressure drop, sections, blade count and order code; prints the submittal.

BIM and trainingRevit families in the BIM library; volume control damper training video on the Training page.

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CONTACT

Select, submit and order

Size dampers and actuators in the quick selector, download catalogues and documents 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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