Single wall oval ductwork

Flat Oval Ducting

HAS Flat Oval Ductwork, is intended for both indoor and outdoor use, it is especially suitable for systems where space is an issue, and it is also more aesthetically pleasing to the eye for those jobs that require an on-show finish.

Flat Oval is the term used to describe a duct of cross-section with flat opposed sides and semicircular ends.
Apart from the stiffening requirements mentioned below flat oval ducts have the same constructional requirements throughout the pressure ranges covered in DW144.

There are 2 finishes available for this product:

  • Standard Galvanised Finish Z275
  • Colorduct II – Painted to any RAL colour specified (data sheet available upon request)

We also offer different flat oval duct sizes that can be requested by contacting us.

Construction

The flat ductwork is made from Hot Dipped Galvanised Steel DX51D Z275, all raw material is supplied and certified to the latest version of BS EN IS 9001.

Straight Ducts

The straight duct is manufactured from a spirally-wound circular duct, it is then stretched using a special former to the required radius and length required. Additional stiffening is required in the form of tie bars which are fitted in line with DW144.

Contact your chosen flat oval ductwork manufacturer experts via phone or email and discover more about the products we offer.

You can also visit our contact page to submit a contact form for us to respond to as soon as possible.

 

Sheet Steel Thickness

The below table shows the sheet thickness for both spirally wound duct and handmade fittings for flat oval ducting, this is applicable to all 3 pressure classes.

Nominal sheet thickness

Surface area per metre length


Depth of duct (minor axis - 'D') - nominal

75

100

125

150

200

250

300

350

400

450

500

1

2

3

mm

Sq.metres

Width of duct (major axis - 'W') -nominal - mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

0.8

0.178

320

0.798

360

350

330

320

0.878

400

390

370

360

0.958

440

430

410

400

1.037

480

470

450

440

1.117

520

505

490

480

1.197

545

530

520

1.277

555

525

1.436

635

605

580

1.596

715

690

660

630

1.756

800

770

740

710

685

655

1.915

880

845

825

790

765

735

705

680

1.0

2.075

960

930

900

875

845

815

785

755

2.238

1040

1010

985

955

925

895

865

835

2.394

1120

1090

1065

1035

1005

975

945

915

2.553

1200

1170

1145

1115

1085

1055

1025

1000

2.873

1335

1305

1275

1245

1215

1190

1160

3.192

1465

1435

1405

1375

1350

1320

3.511

1625

1595

1570

1540

1510

1480

3.830

1785

1760

1730

1700

1670

1640

Flat Oval Duct

Flat Oval Duct Fittings & Sizes

There are standard dimensional standards for flat oval fittings, these will always be adhered to unless specified by our customers to deviate from DW144 standard.

Joining Options

The standard jointing method for straight flat oval ducting is with an oval coupling.
Fittings are made small end as standard to fit into straight duct but can be made female if required.

Sheet Metal flanges are also available if required.

Duct Supports

Supports are an essential part of the ductwork system, and their installation is normally the responsibility of the ductwork contractor.

The standard supports that HAS-Vent supply are stirrups which support the ductwork – these are sold singly but can be made in pairs to wrap around the ductwork.

HAS-Vent can also manufacture a patented fully fitted internal support system if required, which negates the requirement for external supports and enhances the aesthetics of the installation.

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Types of Fittings

We offer different flat oval duct sizes that can be requested by contacting us.

Straight Duct with connectors

Flat Oval to Circular

Transformation piece
Can be concentric, eccentric or offset

Segmented bend (easy)

90 degree four section minimum as illustrated
i.e. middle two sections are full segments and two end sections are half segments

Flat Oval to Rectangular
Transformation piece
Can be concentric, eccentric or offset

Segmented bend (hard) 

90 degree four section minimum as illustrated
i.e. middle two sections are full segments and two end sections are half segments

Offset - easy

Taper - Concentric

Offset - hard

Taper - Eccentric

Conical Branch

Want to know more?

Download our Engineered Air Solutions brochure or contact our expert team to discuss your requirements today!

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