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:
We also offer different flat oval duct sizes that can be requested by contacting us.
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.
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.
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 | |||||||
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.
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.
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.
Enquire TodayWe offer different flat oval duct sizes that can be requested by contacting us.
 | Straight Duct with connectors |  | Flat Oval to Circular Transformation piece |
 | Segmented bend (easy) 90 degree four section minimum as illustrated |  | Flat Oval to Rectangular |
 | Segmented bend (hard) 90 degree four section minimum as illustrated |  | Offset - easy |
 | Taper - Concentric |  | Offset - hard |
 | Taper - Eccentric |  | Conical Branch |
Download our Engineered Air Solutions brochure or contact our expert team to discuss your requirements today!
Contact UsHAS-Vent has been an invaluable asset for our business. When we need a last minute stock manufactured and delivered quickly, their fleet of vehicles ensures that it is done safely and efficiently. The quality of their products is top notch and their customer service is exemplary. We're very happy with our decision to partner with HAS-Vent!
A. Jackson
Wednesday, 12 October 2022
The staff at their Eastleigh location are always friendly and helpful, going out of their way to meet deadlines and provide us with quality products. We've been very impressed with their work, and would highly recommend them!
J. Davies
Monday, 12 December 2022
HAS-Vent Ltd have been our go-to supplier for flexible ducting and fittings for the last couple of years. Their service is reliable and efficient, making it easy to place orders and get them delivered quickly. But most importantly, the product quality is top-notch - much better than other suppliers I have worked with in the past. Highly recommended!
P. Taylor
Tuesday, 23 Febuary 2021
