round duct silencer for spiral duct

DX-series, a quick assembled series for ventilation ducts, is with double metal sheets and fitted insulated
material inside. the other features of this series are almost similar to those of X-series.

assembly instruction:

1. make sure the ducts and duct fittings are all excellent without damage, before use them. and check them if
the angle of cutting is correct or not, deburring as well.
2. slip the inner shell of the double wall fitting into the inner shell of this double wall spiral duct. use
the inner shell extension to aid in guiding the outer shells together.
3. slip the outer shell of the double wall fittings into the outer shell of the double wall spiral duct up
to the bead. slightly roatting the fitting makes insertion easier.
4. fasten the duct and fitting together with self tapping sheet metal screws or rivets.

statements:

1. both of sheets are galvanized
2.the thickness of insulation: 25mm or50mm
3.density: 24kg/m3 as standard, can be changed as well

Ningbo East Ventilation Engineering Co., Ltd(Yuyao Dongfang Ventilation Engineering Co.,Ltd) is an enterprise
professionally dedicated to the design and whole-set installation of ventilation projects and production of
metal components, a professional manufacturer of spiral ventilation pipes and spare parts and a directing unit
formulating industrial standards, owns the most excellent and perfect manufacture process in the ventilation
industry both at home and abroad.
the company owns whole set of the most international advanced metal spiral ventilation pipe and spare part
production lines provided by Swiss SPIRO Company, including JRX automatic pipe making & moulding machines, R1530
plasma cutting machines, CU-30(line and curve) sewing stitch welding machines, COMBI triangle section locking
machines,Lide locking machines, NC spinning machines and so on, in addition, the company introduces Japanese
AMD NC punching machines, as well as metal plate NC producing equipment.
in outstanding physical environment, the company also accelerates the upgrading of invisible environment,
establishes perfect quality assurance system in accordance with the standard of ISO9001 International Quality
System and was successfully awarded the title of Ningbo Famous Trademark in 2009.
the products of the company are widely used in all ventilation fields of ventilation, air conditioning,
cleaning, dust extraction and material conveyance. the company provides large projects such as airports, gyms,
exhibition centers, supermarkets and textile factories with all-around top-quality service