Straight
Fabricated HDPE straight sections made to the required diameter, length and connection arrangement. Specify individual rigid sections or discuss a complete duct run.
Enquire about Straight →↑ Back to listRigid HDPE Ducting for Underground Mine Ventilation
Custom-fabricated straight sections, bends, branches and transitions for demanding ventilation applications. Common circular diameters are 1200, 1400 and 1600 mm, with custom sizes made to suit your application. Designed around your operating pressure, available space and connection requirements, Polyduct provides a rigid ducting option where your ventilation system needs it most.
Fabricated
HDPE sheet
Custom
Dimensions & connections
Made to order
Designed for your application
Rigid ducting where it makes a difference
Vent bags are an established part of underground ventilation. At bends, junctions and higher-pressure sections, rigid ducting can provide an alternative suited to more demanding conditions. Polyline fabricates HDPE sections to meet these local requirements, including connections to existing ventilation systems.
Designed for demanding sections
Specify rigid bends, branches and duct sections around your operating pressure, layout and installation requirements.
Made to fit your mine
Custom diameters, angles, transitions and connections help accommodate the space and equipment already on site.
Lightweight alternative to steel
HDPE offers a lighter material alternative to steel ducting, with handling weight considered as part of each design.
Corrosion-resistant construction
HDPE does not rust, making it a practical material choice for damp underground environments.
Look beyond the initial purchase price
Fabricated HDPE ducting typically costs more upfront than vent bags or steel alternatives. Its value lies in choosing it for the right application: where corrosion resistance, handling weight, a rigid section or a custom fit matters. Polyline can work with your requirements to identify where fabricated HDPE belongs in your ventilation layout.
Designed, analysed and fabricated from HDPE sheet
We CNC-cut HDPE flat sheet, form and butt-weld the components, then complete the fabrication using extrusion welding techniques. This allows us to manufacture ducting around your required geometry and connections.
Fabrication capability
Fabrication capability: sheet thicknesses of 3, 6, 10, 15, 20, 30, 40 and 50 mm. Material thickness and construction are selected for the application.
The range
Ducting sections and fittings
Explore fabricated straight sections, bends, branches, valves and transitions. Each configuration can be developed around your duct dimensions, operating requirements and installation space.
Straight sections
Bends
90° Bend – 5 Section
A five-section fabricated bend for a 90° change in direction. Bend radius, diameter and connections are configured around the ventilation layout.
Enquire about 90° Bend – 5 Section →↑ Back to list90° Bend – 3 Section
A three-section fabricated bend for a 90° change in direction. Discuss the available space and required geometry with our team.
Enquire about 90° Bend – 3 Section →↑ Back to list60° Bend – 3 Section
A fabricated 60° bend for changes in ventilation direction, with dimensions and connections made to suit the installation.
Enquire about 60° Bend – 3 Section →↑ Back to list45° Bend – 3 Section
A fabricated 45° bend for angled duct runs. Diameter, section dimensions and end connections can be tailored to your requirements.
Enquire about 45° Bend – 3 Section →↑ Back to listBranches & junctions
T-Piece
A fabricated junction connecting a main duct run with a side branch. Specify the main and branch diameters, orientation and connection details.
Enquire about T-Piece →↑ Back to listY-Piece
A fabricated Y-junction connecting a main duct with two branches. Branch angles and diameters can be configured around your layout.
Enquire about Y-Piece →↑ Back to list45° Branch
A fabricated branch connection at the specified angle, with main and branch dimensions tailored to your ventilation system.
Enquire about 45° Branch →↑ Back to list60° Branch
A fabricated branch connection at the specified angle, with main and branch dimensions tailored to your ventilation system.
Enquire about 60° Branch →↑ Back to list4-Way Section
A custom junction connecting four duct runs, fabricated around the required diameters, orientations and available space.
Enquire about 4-Way Section →↑ Back to listValves & connections
Directional Valves
Discuss a valve configuration for directing airflow between sections of your ventilation system, including its operating and connection requirements.
Enquire about Directional Valves →↑ Back to listFlanged End
Fabricated flange connections to suit adjoining ductwork or equipment. Specify the mating dimensions and required connection details.
Enquire about Flanged End →↑ Back to listSpecial configurations
1400 mm Oblique Ducting
A custom-profile duct section for installations with restricted headroom or clearance. Geometry is developed around the available space and ventilation requirements.
Enquire about 1400 mm Oblique Ducting →↑ Back to list1400–1600 Fabricated Trouser-Y
A fabricated junction connecting one duct run with two legs. Specify the inlet and outlet dimensions, branch geometry and any required transitions.
Enquire about 1400–1600 Fabricated Trouser-Y →↑ Back to listIntake Non-Return Valve
A duct section incorporating a non-return flap intended to limit reverse airflow. Discuss operating conditions and suitability with our team.
Enquire about Intake Non-Return Valve →↑ Back to listReducing Trouser-Leg
A branching section incorporating a change in duct diameter, fabricated to connect different-sized runs within the available space.
Enquire about Reducing Trouser-Leg →↑ Back to listConnections built around your system
Fabricated flange connections and vent-bag adapters connect your ducting to the rest of the ventilation system. Connection details are developed around the adjoining equipment and site requirements.
Tell us where rigid ducting is needed
Send your layout or sketch, required dimensions and quantities, plus any known operating pressures and connection details. Whether you need a bend, a transition or a complete duct run, we can discuss a fabricated HDPE solution for your application.