Air duct manufacturing

Ductwork

Ducts Types

1.      Rectangular or Square ductwork commonly is fabricated to suit by specialized metal shops. For ease of handling, it most often comes in 2 sections (or joints).

2.   Round duct is made using forming machines which can make round duct in nearly any diameter,
  

Duct Material

Galvanized steel

Galvanized or hot-dipped galvanized steel (GI) it is the standard and most common material used in fabricating ductwork because

Its corrosion-resistance, strength and relatively inexpensive cost.by avoids cost of painting.

 Zinc offers protection to the steel by forming a barrier against the elements, as well as sacrificing itself to prevent steel corrosion.

The amount of zinc coating applied over top the core steel for corrosion protection varies depending upon end-use and specification requirements, and can be controlled and measured to industry standards.

Common coating weights for galvanized steel are G30, G40, G60 and G90. It is important to note that. These coating weights designate a total of 0.30, 0.40, 0.60, and 0.90 oz/ft2, respectively. While these. The corrosion resistance, and thus, the service life, is proportionate to the amount of zinc coating on the steel. Hence, the service life of a G90 will generally be 3 times that of a G30 and 1.5 times that of a G60 in the same environment. However, the service life of any galvanized steel product is dependent upon the environment in which it is exposed.

CONTINUOUS SHEET GALVANIZED COATING SPECIFICATIONS

Zinc Coating Thickness

Metric Measurement

Total Both Sides

English Measurement

Total Both Sides

Thickness (microns)

Thickness (mils)

g/m2

Designation

oz/ft2

Designation

6.90

0.27

90

Z90

0.30

G30

9.10

0.36

120

Z120

0.40

G40

13.7

0.54

180

Z180

0.60

G60

20.6

0.81

275

Z275

0.90

G90

23.0

0.90

300

Z300

1.00

G100

26.3

1.04

350

Z350

1.15

G115

32.0

1.26

450

Z450

1.40

G140

37.7

1.49

500

Z500

1.65

G165

42.3

1.67

550

Z550

1.85

G185

48.0

1.89

600

Z600

2.10

G210

53.7

2.12

700

Z700

2.35

G235

68.6

2.70

900

Z900

3.00

G300

82.3

3.24

1100

Z1100

3.60

G360

Grade:

DX51D + Z275MA-C (DIN EN 10346 and DIN EN 10143) 

Sheet thickness 

Ducts and fittings are fabricated from galvanized sheets which are hemmed and seamed, pressure-welded, or riveted. The ducts and fittings are available in low, medium and high pressure versions (max. overpressure / min. vacuum):

class L design (low-pressure design):

standard design from -400 Pa to +1000 Pa

class M design (medium-pressure design):

from -1000 Pa to 2000 Pa

class HR design (High-pressure design):

from -1500 Pa to 3000 Pa

class H design (High-pressure design):

from -2500 Pa to 6000 Pa

See below The table provides Sheet thicknesses and pressure ratings as per VDI 3803.

Nominal dimensions

(edge lengths) 12

as per EN 1505

Low pressure Class L

medium  pressure Class M

High pressure Class HR

Welded ducting

Class H

Max. pressure

min. vacuum

Max. pressure

min. vacuum

Max. pressure

min. vacuum

Max. pressure

min. vacuum

A

B

Pa +1000 

Pa -500

Pa +2000 

Pa -750

Pa +3000

Pa -1500

Pa +6000

Pa -2500

100

100

0.6

0.7

1.00

1.5

150

150

200

200

250

250

2.0

300

300

400

400

500

500

600

600

0.8

0.9

800

800

1000

1000

1200

1200

1.0

1.1

1.2

3.0

1400

1400

1600

1600

1800

1800

2000

2000

Nominal dimensions

outside

DIN EN 1505

> 2000 to 3000

Special non-standard components are manufactured on request.

For the tender specification, the customer must state specific requirements for the sheet thickness and frame connection. They are charged for as special components

Fabrication Facility

Our Standard Products:

Ø Rectangular or Square Duct And Fittings,

Ø Round Duct And Fittings,

Ø Welded Duct Systems,

CNC Machines

Middle East Workshop ducting having more than 20 CNC duct making machine  

Our MAJOR EQUIPMENT:

 Fully automated coil to duct  line 6

It can make TDF flange / angle steel flange / C-cleat flange forming. The capacity of day is 1000-2500 square meters. Users can only input sizes of duct you need, then this auto line will automatically complete unwinding, leveling, Punching, shearing, Pittsburgh lock forming, TDF/Angle steel flange forming and C-cleat flange and folding into rectangular ducts.







Duct connections and Joints 

1. Longitudinal Duct Connection 





2. Transverse Duct Connector system 





Folded air duct with formed frame (TDF built in connectors (SMACNA - T25A  / T25B )

Turning vanes

Turning vanes as per DIN EN 1505 , As standard, the turning vanes are fastened With sealed studs

90° BENDS AS PER DIN EN 1505 1

Edge length b as per DIN 18379 (VOB Part C).








Width of ducting

[mm]

Number of

turning vanes

Space betwee turning vanes (approximate) [mm]

b1

b2

b3

400 < b ≤ 800

1

b/3

 

 

800 < b ≤ 1600

2

b/4

b/2

 

1600 < b ≤ 2000

3

b/8

b/3

b/2




QUALITY  STANDARDS 

Middle East of Services Fabrication of division a is Workshop Fabrication Duct

Middle East Duct Fabrication Workshop HVAC ducting the product are manufactured to exacting standards using the finest materials and latest manufactured techniques (CNC Machines).

Our products are with accurate tolerance level that make it easy to assemble and excellent installation

We manufacture HVAC air duct products fully in compliance with the procedures of ISO 9001: 2008 system. The HVAC duct work systems for air movements around buildings are generally constructed to the SMACNA HVAC guide DW ASTM, the documents covering a wide range construction standards in the manufacture of sheet metal duct works for use in low, medium and  high pressure, applications and includes various methods of jointing stiffening  and supporting of the duct work.

STANDARDS AND GUIDELINES

HVAC is undergoing a period of upheaval in terms of standards and regulations. Some of the DIN standards have been withdrawn and replaced by EN standards. Although fundamental contractual freedom exists, withdrawn DIN standards may no longer be used In a legal dispute, only the EN standards apply.

This means that there always an obligation to check that the standards are up to date.

Here is a list of standards which must always be observed for ducting:

STANDARDS

GUIDELINES

DIN EN 1505

Sheet metal air ducts and fittings with rectangular cross section – Dimensions

DIN EN 1507

Sheet metal air ducts with rectangular section - Requirements for strength and leakage

DIN EN 12097

Requirements for ducting components to facilitate maintenance of ducting systems

DIN EN 12236

Ductwork hangers and supports

DIN EN 12599

Test procedures and measurement methods to hand over air conditioning and ventilation systems

DIN EN 13779

Ventilation of non-residential buildings

DIN 18379

VOB Part C - General technical specifications in construction contracts

DIN 18869-4

Equipment for commercial kitchens - Components for ventilation

DIN 24193-1*

Ducting for ventilation equipment; flanges; series 1 angle flanges

DIN 24193-2*

Ducting for ventilation equipment; flanges; series 2 angle flanges

DIN 1946-4

Ventilation systems in hospitals

VDI 2052

Air-conditioning - Kitchens (VDI Ventilation Code of Practice)

VDI 2087

Air ducts - Operating and construction fundamentals

VDI 2089

Building services in swimming baths

VDI 3803

Central air-conditioning systems - Structural and technical principles

VDI 6022

Hygiene requirements for ventilation and air-conditioning systems and units