Description
Product Overview
Polypropylene round ducts are injection-molded PP ventilation pipes used to move air and low-concentration fumes in laboratories, workshops, warehouses and general exhaust systems. XICHENG supplies them as straight round duct sections from φ20 mm to φ500 mm in standard 3 m or 4 m lengths, with wall thickness matched to each diameter.
Polypropylene (PP) is a lightweight thermoplastic synthetic resin with high chemical resistance and good mechanical strength. Round PP ducts are injection molded to give a smooth internal surface, consistent wall thickness and low flow resistance. They are produced in standard and PPs flame retardant grades, in beige or grey, and support flange, socket or hot-air welding connections.
This round duct family is sold in two standard size groups: φ20-φ90 mm sections for ventilation and drainage duty, and φ110-φ500 mm sections for ventilation duty. Custom diameters, wall thicknesses and lengths are available. Duct sections are one part of a ventilation system: they connect to fans, fittings and dampers rather than replacing them, and the XICHENG range includes matching elbows, tees, reducers, flanges, couplings and airflow dampers so a complete PP duct line can be specified from one supplier.
Product Selection Summary
Good Fit
- Laboratory and process exhaust requiring corrosion-resistant rigid ductwork
- Workshop and warehouse ventilation at normal temperature conditions
- Chemical fume handling where smooth walls reduce pressure loss and deposits
- Systems built with flange, socket or hot-air welding joints
Conditions To Confirm
- Gas composition, concentration, temperature and moisture at the actual operating point
- Diameter, wall thickness and section length per duct run
- Connection method (flange, socket, or welding) for each joint
- Available static pressure and airflow schedule
- Flame retardant grade, when fire-rated ductwork is required
Not a Replacement For
- Fans, airflow balancing devices, room controls or treatment equipment
Technical Specifications
Confirmed Product Parameters
| Parameter | Value |
|---|---|
| Product Type | Polypropylene Round Ducts (injection molded) |
| Material | PP or PPs flame retardant material |
| Diameter Range | φ20 mm – φ500 mm (standard) |
| Wall Thickness | 2.8 mm – 5.5 mm (matched to diameter) |
| Standard Length | 4 m (φ20-φ90), 3 m (φ110-φ500) |
| Working Temperature | -15℃ to 80℃ |
| Color | Beige / Grey |
| Connection Method | Flange / Socket / Hot-air welding |
| Certification | ISO9001, ISO14001, RoHS |
Available Sizes
Standard Size Options
| Outer Diameter | Wall Thickness | Weight | Length | Duty |
|---|---|---|---|---|
| φ20 mm | 2.8 mm | 0.5 kg | 4 m | Ventilation & drainage |
| φ25 mm | 2.8 mm | 0.6 kg | 4 m | Ventilation & drainage |
| φ32 mm | 3.5 mm | 1.0 kg | 4 m | Ventilation & drainage |
| φ40 mm | 4.0 mm | 1.3 kg | 4 m | Ventilation & drainage |
| φ50 mm | 4.0 mm | 1.8 kg | 4 m | Ventilation & drainage |
| φ63 mm | 4.5 mm | 3.65 kg | 4 m | Ventilation & drainage |
| φ75 mm | 5.0 mm | 4.34 kg | 4 m | Ventilation & drainage |
| φ90 mm | 5.0 mm | 5.19 kg | 4 m | Ventilation & drainage |
| φ110 mm | 3.0 mm | 2.6 kg | 3 m | Ventilation |
| φ160 mm | 3.0 mm | 4.5 kg | 3 m | Ventilation |
| φ200 mm | 3.3 mm | 6.0 kg | 3 m | Ventilation |
| φ250 mm | 4.0 mm | 9.0 kg | 3 m | Ventilation |
| φ315 mm | 4.2 mm | 12.0 kg | 3 m | Ventilation |
| φ355 mm | 4.2 mm | 14.4 kg | 3 m | Ventilation |
| φ400 mm | 4.5 mm | 16.8 kg | 3 m | Ventilation |
| φ450 mm | 4.8 mm | 20.0 kg | 3 m | Ventilation |
| φ500 mm | 5.5 mm | 23.5 kg | 3 m | Ventilation |
Custom Sizes
Custom diameters, wall thicknesses and lengths are available for engineering projects. Send your duct schedule and drawings so each section can be confirmed with approved dimensions before manufacture.
Material & Performance
PP round duct pipes are corrosion resistant across a wide pH range (pH 1-14), which suits chemical fume and laboratory exhaust applications. The smooth inner wall of the pipe and its fittings gives low flow resistance and reduces scaling, keeping the duct system efficient over time.
Polypropylene offers several properties that matter in ventilation ductwork:
- Acid and alkali resistance: PP withstands high-concentration acids and alkalis in a wide temperature range, preventing secondary chemical reactions between the medium and the pipe body.
- Wear resistance and no scaling: the uniform, smooth inner surface lowers flow resistance and resists deposit buildup.
- Reduced vibration and noise: PP has sound insulation performance that dampens vibration and noise caused by air flow.
- Anti-freeze cracking: PP elasticity lets the pipe section expand with frost-heaving liquid without bursting.
- Anti-condensation, low heat loss: PP is a poor thermal conductor, reducing condensation and heat loss along the run.
- Light weight and easy installation: PP pipe is light, easy to install and operate, and has excellent weldability.
- Long service life: PP duct systems offer a service life of up to 50 years under specified operating conditions.
PPs flame retardant material is available where fire-rated ductwork is required; specify the required flame retardant grade when inquiring.
Applications
Polypropylene round ducts are used wherever ventilation is needed at normal temperature conditions, particularly where media are corrosive:
- Laboratory ventilation and fume exhaust ducting
- Workshop ventilation for corrosive gas treatment
- Warehouse ventilation and general air movement
- Chemical and plating process exhaust where pH resistance is required
- Daily-life and sanitary exhaust systems
Because PP prevents secondary reactions between the carried medium and the pipe body, it reduces the purification difficulty of industrial waste gas and waste liquid compared with metal ducting in corrosive services.
Selection Notes & Quotation Information
To size a polypropylene round duct system, provide the airflow schedule, duct layout, gas composition, concentration, temperature and available static pressure. Industry design practice specifies the required wall thickness and reinforcement under given wind speeds; for industrial exhaust systems with centrifugal fans at the end, reinforcement by external flanges is commonly used.
For a quotation please send: required diameter(s), quantity, section length and wall thickness, application, destination port, and preferred connection method. MOQ and lead time are confirmed per project.
Request a quote via WhatsApp or email using the contact block below.
Installation & System Integration
Round PP ducts are connected with flanges, socket joints or hot-air welding.
- Socket connection: a PP sleeve is welded at the end of each duct section so the next section inserts for a stable joint – fast field installation.
- Flange connection: PP flanges are welded at both ends and joined with screws – suited to high-strength, high-sealing working conditions and allows maintenance disassembly.
- Hot-air welding: creates a continuous sealed line where a monolithic run is preferred.
In industrial exhaust systems with a centrifugal fan at the end, the fan creates negative pressure inside the duct; reinforcement by external flanges is a common practice. For example, a 3-meter duct is typically reinforced with 2 flanges. Large square duct runs use external flange reinforcement plus internal PP circular pipe for structural support.
XICHENG supplies the matching range to complete the system: PP 90° elbows, flanges, couplings, tees, reducers and back draft dampers. See the full range of PP duct systems.
Related Products
- Polypropylene/PP Air Duct
- PP Plastic Exhaust Duct
- Custom PP Round Duct
- Flame Retardant PP Ventilation Pipe
FAQ
What sizes are available?
Standard round duct sections run from φ20 mm to φ500 mm, in 4 m lengths for φ20-φ90 mm and 3 m lengths for φ110-φ500 mm. Custom diameters and wall thicknesses are available on request.
Can the duct be customized?
Yes. Custom diameter, wall thickness, length and color can be confirmed per project based on your duct schedule and drawings.
Is flame retardant PP available?
Yes. PPs flame retardant material is available; specify the required flame retardant grade when inquiring.
What is the working temperature range?
The working temperature is -15℃ to 80℃. Material grade affects the exact limits, so confirm your operating temperature with the order.
How are round duct sections connected?
Three methods are available: socket joints (a sleeve welded at the section end for fast insertion), flange connections (screw-locked PP flanges for high-sealing duties), and hot-air welding for continuous sealed runs.
What is the typical service life?
PP duct systems offer a service life of up to 50 years under specified operating conditions.
Contact the XICHENG EP Team Today.
Send your round duct requirements – diameter, quantity, length and wall thickness, application, destination and preferred connection method – and our engineering team will confirm specifications and return a quotation.
📌 Manufacturing Head Office: No.34 Zhenxing Road (Shengtaian Heavy Industrial Park B), Loucun, Guangming New Dist, Shenzhen, Guangdong, China
☎️ Direct Hotline / WhatsApp: +86 189 2745 6906
📬 Engineering Mailbox: xicheng023@outlook.com
