Installed and insulated ductwork distribution in a large building ceiling void
EST. 1997 · HONG KONG

Hong Kong ductwork connection system manufacturer

Since 1997, 361 Hong Kong projects have been built with Lin Sing ductwork.

View flange specificationsBrowse 361 projects
DW144DW/TM1ISO 9001Joint class J2 – J5

Three points of third-party evidence

Evidence
DW144

Full DW144 compliance

HVCA ductwork specification, met across ducting and connections.

DW/TM1

Independent HKU testing

Conducted to the DW/TM1 procedure by Ir HN Lam, HKU.

ISO 9001

ISO 9001 quality management

Production governed by a documented quality management system.

Flange Connection System

Flagship
HLGDuct wallFlange profileGasketDrive clip
Flange joint — schematic section

Four profiles across three sizes, covering joint classifications J2 to J5. Fully DW144 compliant and independently tested to DW/TM1.

ModelSizeGauge
LS225 mm—
LS330 mm—
LS440 mm1.0 mm
LS540 mm1.2 mm

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JOINT CLASSIFICATION

J2J3J4J5

PRESSURE CLASS

ABC

All passed. Full matrix on the flange system page.

Products

Range

From duct body to air terminal, out of a single production line.

Rectangular Ductwork

方管風喉

Fire Damper

防火閘

Access Panel

修理門

Volume Control Damper

調節閥

Air Grilles & Diffusers

風咀

Air Filter

過濾網

Silencer

消音器

Flagship

Flange Connection System

Independently tested to DW/TM1 →

Project Record

Record
361projects
1997–2026years
12sectors
Residential49Public Facilities48Retail & Malls46Education40Healthcare28Government24

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