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Shenzhen GuanLan TianJi Hardware Factory has engaged in the manufacturing of HVAC(Heating – Ventilation – Air Conditioning) air distribution products and systems since 1995. In addition to our experience, with over 100,000 square meters in manufacturing space, our China factory has the capacity to produce all types of air ducts. We are not only capable to manufacture rectangular air ducts, but also specialize in spiral round air ducts, flat oval air ducts, aluminum claddings and associated fittings. All our products are tailor made to client’s specifications.

Our factory has accumulated the necessary knowledge, skill and experience for manufacturing quality products that suits clients’ needs.

All of our HVAC Rectangular, Spiral (Round) and Oval ductwork manufacturing are complied with international standards: SMACNA (USA) & DW 144 (UK). In 2008, We also complied with ISO 9001: 2000.




We are also dedicated to supply theup-to-standard air ventilating accessories such as:
-Volume Control Dampers
-DC II Slide on Flange Profile (8-125mm/ 10-135mm/ 12-140mm)
-TDC II Flange Corner
-Flat S / C Cleat
-Standing S / C Cleat
-Access Panel / Door
-Support / Suspension Rods
-Veryflex G.I. Hose Clamp
-Neoprene Flange Gasket / Butyl Gasket Tape
-Screw / Washer / Nut



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