The type and specification of ductwork used in HVAC systems performs an integral role in influencing the indoor air quality for commercial and industrial facilities. Ventilation systems must be appropriately designed and maintained to regulate ambient temperature and humidity levels in properties, with efficient airflow crucial for the removal of air contaminants.
HAS-Vent manufactures an extensive range of rectangular ductwork and fittings, offering ultimate design and configuration flexibility to suit buildings where space comes at a premium. Our ductwork ensures optimal airflow for ventilation, enhancing HVAC system performance in indoor and outdoor environments alike.
HAS-Vent ductwork is manufactured from Hot Dipped Galvanised Steel DX51D Z275, all raw material is supplied and certified to the latest version of BS EN IS 9001.
All ductwork and fittings are available with 2 high-quality finishing options:
The below specifications cover duct sizes up to a maximum longer side of 3000mm. Duct sizes with an aspect ratio greater than 4:1 are not recommended. Although they offer no problems of construction, they increase frictional resistance and the possibility of noise.
At HAS-Vent, our ventilation specialists are available to support your ductwork order enquiries, offering industry-leading guidance for technical details and project requirements.
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Circular ducts are the most common form of ventilation duct used in commercial and industrial HVAC systems. At HAS-Vent we produce a comprehensive range of circular ducts and fittings that enable efficient air transportation in ventilation systems.
Circular ducts can, however, be difficult to fit into spaces and building layouts, rendering them unsuitable for certain project requirements.
Rectangular ducts provide added flexibility in design, often chosen for their aesthetic appeal and ability to be configured to suit complex ventilation and building layouts. As a result, the ductwork maintains excellent airflow performance with maximised space efficiency serving as an effective alternative to circular ductwork.
HAS-Vent additionally offers a range of flat oval ducts and components, offering an additional option to suit spatial and aesthetic criteria.
To discuss your project and ventilation system requirements, contact our specialist team today for further support and enquiries.
Enquire NowFLANGED JOINTS | Dimensions in mm | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
MIN. SHEET THICKNESS | 0.6 | 0.8 | 1.0 | 1.2 | ||||||
DUCT LONGEST SIDE | 400 | 600 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3000 | |
RATING | SHEET | MAXIMUM SPACING BETWEEN FLANGES AND / OR STIFFENERS | ||||||||
J1/S1 | PS | 3000 | 1600 | 1250 | 625 | |||||
SS | 3000 | 3000 | 1250 | 625 | ||||||
J2/S2 | PS | 3000 | 2000 | 1600 | 1250 | 625 | ||||
SS | 3000 | 3000 | 1600 | 1250 | 625 | |||||
J3/S3 | PS | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | |||
SS | 3000 | 3000 | 2000 | 1600 | 1250 | 800 | ||||
J4/S4 | PS | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | 800 | ||
SS | 3000 | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | |||
J5/S5 | PS | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | 625 |
SS | 3000 | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | |
J6/S6 | PS | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | 800 |
SS | 3000 | 3000 | 2000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | |
FLANGED JOINTS AND STIFFENERS | Dimensions in mm | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
MIN. SHEET THICKNESS | 0.6 | 0.8 | 1.0 | 1.2 | ||||||
DUCT LONGEST SIDE | 400 | 600 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3000 | |
RATING | SHEET | MAXIMUM SPACING BETWEEN FLANGES AND / OR STIFFENERS | ||||||||
J1/S1 | PS | 3000 | 1250 | 625 | ||||||
SS | 3000 | 1250 | 625 | |||||||
J2/S2 | PS | 3000 | 1250 | 1250 | 625 | |||||
SS | 3000 | 1600 | 1250 | 625 | ||||||
J3/S3 | PS | 3000 | 1600 | 1250 | 1000 | 800 | ||||
SS | 3000 | 3000 | 1600 | 1250 | 800 | |||||
J4/S4 | PS | 3000 | 1600 | 1250 | 1000 | 800 | 800 | |||
SS | 3000 | 3000 | 1600 | 1250 | 1000 | 800 | ||||
J5/S5 | PS | 3000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | 625 | |
SS | 3000 | 3000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | ||
J6/S6 | PS | 3000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | 800 | 625 |
SS | 3000 | 3000 | 1600 | 1250 | 1000 | 800 | 800 | 800 | 625 | |
FLANGED JOINTS AND STIFFENERS | Dimensions in mm | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
MIN. SHEET THICKNESS | 0.8 | 1.0 | 1.2 | |||||||
DUCT LONGEST SIDE | 400 | 600 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | ||
RATING | SHEET | MAXIMUM SPACING BETWEEN FLANGES AND / OR STIFFENERS | ||||||||
J1/S1 | PS | 3000 | 625 | |||||||
SS | 3000 | 625 | ||||||||
J2/S2 | PS | 3000 | 1250 | 800 | ||||||
SS | 3000 | 1250 | 800 | |||||||
J3/S3 | PS | 3000 | 1250 | 1250 | 800 | |||||
SS | 3000 | 1250 | 1250 | 800 | ||||||
J4/S4 | PS | 3000 | 1250 | 1250 | 1000 | 800 | ||||
SS | 3000 | 1250 | 1250 | 1000 | 800 | |||||
J5/S5 | PS | 3000 | 1250 | 1250 | 1000 | 800 | 800 | 625 | ||
SS | 3000 | 1250 | 1250 | 1000 | 800 | 800 | 625 | |||
J6/S6 | PS | 3000 | 1250 | 1250 | 1000 | 800 | 800 | 800 | 625 | |
SS | 3000 | 1250 | 1250 | 1000 | 800 | 800 | 800 | 625 | ||
 | Mitred Throat Bend For ducts up to 400mm wide | Examples of 'Hard' and 'Easy' bends  'Hard' signifies rotation in the plane of the longer side of the cross section (top sketch). 'Easy' signifies rotation in the plane of the shorter side of he cross section (bottom sketch) | |||||||||||||||||||||||
 | Short Radius Bend For ducts up to 400mm wide | ||||||||||||||||||||||||
 | Medium Radius Bend (as illustrated) Long Radius Bend Similar but radius = W Applies to any angle | ||||||||||||||||||||||||
 | Short Radius Bend with splitters
Splitters not required in bends of 45° or less | ||||||||||||||||||||||||
 | Square Bend - with turning vanes Mitred elbow - 30° max | ||||||||||||||||||||||||
 | Radius Tee - with 'radiussed back plates' and, if required, splitters | ||||||||||||||||||||||||
 | Angled Offset |
 | Mitred Offset |
 | Radiussed Offset |
 | Concentric Taper 22.5° max in either plane Splitters are required for angles greater than 22.5° and should bisect the angle between the sid eand the duct centreline. |
 | Ecccentric Taper 22.5° max in either plane Splitters are required for angles greater than 22.5° and should bisect the angle between the sid eand the duct centreline. |
 | OffsetTaper Splitters are required for angles greater than 22.5° and should bisect the angle between the sid eand the duct centreline. |
 | Radiussed Twin Bend | ||||||||||||
 | Swan Neck Bend - typically found on roof exhausts i.e. 135° angle | ||||||||||||
 | Swept Branch | ||||||||||||
 | Square Tee with turning vanes | ||||||||||||
 | Breeches Piece | ||||||||||||
 | 'Y' Piece | ||||||||||||
 | Rectangular to Round Transformation | ||||||||||||
 | Rectangular to Flat Oval Transformation | ||||||||||||
 | Square Branch | ||||||||||||
 | Angled Branch | ||||||||||||
 | Shoe Branch
| ||||||||||||
 | Bell Mouth Branch
| ||||||||||||
 | Bell Mouth
|
Supports for rectangular horizontal ductwork | |||||
Longest Side | HANGERS | BEARERS | Maximum Spacing's | ||
Screwed Rod | Flat Strap Fig 156/164 | Stirrups | "Z" cm³ x-x | ||
Up to 400 | 6 | 25 x 0.5 Plain or Perforated | N/A | 0.40 | 3000 |
401 - 600 | 8 | 30 x 3 flat | N/A | 0.70 | 3000 |
601 - 1000 | 8 | N/A | N/A | 1.50 | 3000 |
1001 - 1500 | 10 | N/A | N/A | 2.10 | 2500 |
1501 - 2000 | 10 | N/A | N/A | 3.05 | 2500 |
2001 - 3000 | 12 | N/A | N/A | 4.45 | 2500 |
From small to industrial-scale ventilation system projects, HAS-Vent is equipped with the expertise to design, advise and deliver bespoke ductwork builds for your building/facility. Our expert team will analyse your technical drawings to determine which products would suit your project, providing tailored designs with quotes to assist you with your project.
Our rectangular ductwork and fittings are manufactured in-house in our modern production facilities to the highest standards. Regional and national delivery is then available from our fleet of strategically positioned delivery vehicles to provide swift delivery for your project’s needs.
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We are a leading supplier and British custom ventilation manufacturer to the construction industry, we make it our mission to offer excellent value and superior customer support.
We manufacture and supply Flat Oval, Circular, Rectangular and Colorduct II ductwork from our modern production facility in the Midlands. Get in touch to see how we can support your project.
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
