Introduction
PP duct cost is determined by four variables — diameter, wall thickness, UV stabilization requirement, and whether the duct is standard round or custom rectangular — and the purchase price of the duct material is roughly half the installed cost after labor, supports, and fittings are accounted for. This guide provides actual price ranges for PP duct by diameter (100mm through 1,000mm), compares PP duct costs against galvanized steel, SS304, and FRP alternatives, and shows the 10-year total cost of ownership that reveals PP duct as the least expensive option in any corrosive exhaust application despite a 10–20% material price premium over galvanized steel. All prices are factory-direct from Xicheng EP, based on 2026 material and labor costs for standard industrial ventilation ductwork. For the complete design specification — duct types, sizing, and installation — see our PP duct system design guide.
For specifications and pricing, browse our product catalog.
Key Takeaways
– PP duct material costs $18–45 per meter for standard diameters (200–500mm), 10–20% more than galvanized steel but 5–10% less than SS304 stainless.
– Installed cost is roughly 2× material cost — labor, supports, fittings, and expansion joints add 80–120% to the duct material price depending on installation complexity and site access.
– 10-year TCO for PP duct is 40–50% lower than steel in corrosive exhaust because PP eliminates the 5-year replacement cycle. The TCO saving typically exceeds the entire initial installation cost.
– Custom rectangular PP duct costs 30–50% more than round of equivalent cross-sectional area because square duct requires internal reinforcement ribs and more complex welding.
PP Duct Prices by Diameter — 2026 Factory-Direct Pricing
The table below shows current (2026) material-only prices for standard PP duct in 3-meter and 6-meter lengths, round cross-section, homopolymer PP, 5–8mm wall thickness depending on diameter. Prices are for UV-stabilized PP (outdoor-rated). Standard PP (indoor only) is approximately 10–15% less.
| Diameter (mm) | Wall Thickness (mm) | Price per Meter | Price per 6m Length | Typical Application |
|---|---|---|---|---|
| 100 | 3–4 | $12–18 | $72–108 | Lab fume hood exhaust |
| 160 | 4–5 | $16–24 | $96–144 | Small chemical lab ventilation |
| 200 | 5 | $20–30 | $120–180 | Electroplating bench exhaust |
| 250 | 5 | $25–36 | $150–216 | Industrial process ventilation |
| 315 | 6 | $32–45 | $192–270 | Main trunk duct, medium facility |
| 400 | 6–7 | $40–55 | $240–330 | Scrubber inlet/outlet duct |
| 500 | 7–8 | $55–75 | $330–450 | Large facility main exhaust |
| 630 | 8–10 | $72–95 | $432–570 | Central exhaust riser |
| 800 | 10–12 | $95–130 | $570–780 | Multi-scrubber common duct |
| 1000 | 12–15 | $130–180 | $780–1,080 | Utility-scale ventilation |
What affects PP duct cost beyond diameter:
- Wall thickness — standard wall (5–8mm for most diameters) handles negative pressures up to 2,500 Pa. Heavy-wall duct (10–15mm) for higher negative pressure or mechanical impact resistance costs 25–40% more.
- UV stabilization — carbon black or UV absorber additives add 10–15% to the material cost. Required for all outdoor duct; optional for indoor duct in naturally lit areas.
- FR-grade (flame retardant) — UL 94 V-0 rated PP with halogen-free flame retardant additives costs 15–25% more than standard homopolymer PP. Required for duct passing through fire-rated compartments (check local code).
- Fittings — elbows, tees, reducers, branch connections, and dampers typically add 40–60% to the straight duct material cost for a typical industrial ventilation system. A 100-meter duct run with 8 elbows, 3 tees, 2 dampers, and 5 reducers will have a fitting cost approximately equal to 50% of the straight duct material cost.
Installed Cost — Labor, Supports, and Accessories
The installed cost of a PP duct system is approximately 1.8–2.2× the material cost depending on site conditions. The three components that add to material cost:
- Installation labor — 30–40% of installed cost. PP duct is 60% lighter than steel, reducing labor hours by roughly half compared to equivalent-diameter steel duct. Industry-standard labor estimates from SMACNA for industrial duct installation confirm that weight per meter is the dominant variable in installation productivity. A two-person crew installs 30–50 meters of PP duct per day depending on diameter, joint complexity, and working height.
- Support system — 10–15% of installed cost. Includes saddles, threaded rod hangers, support brackets, EPDM pads, and anchors. PP duct supports cost less than steel duct supports because the lighter duct weight allows smaller brackets and wider spacing.
- Fittings — 40–50% of material cost, as noted above. PP elbows and tees are fabricated from the same PP sheet as the straight duct, with welded seams. Complex fittings (multi-branch junctions, rectangular-to-round transitions) cost proportionally more because they require more cutting, fitting, and welding labor.
- Expansion joints — 5–10% of installed cost for systems with long straight runs. Axial PP bellows cost $80–250 each depending on diameter; a typical industrial system requires one expansion joint every 15–25 meters.
Estimated installed cost per meter (all-in, including labor + supports + fittings):
| Diameter | Material Only | Installed (All-In) |
|---|---|---|
| 200 mm | $20–30/m | $40–65/m |
| 315 mm | $32–45/m | $65–95/m |
| 500 mm | $55–75/m | $110–160/m |
| 800 mm | $95–130/m | $190–280/m |
For a detailed breakdown of PP duct fabrication and welding procedures that affect installation cost, see our PP welding method guide.
PP Duct vs Steel vs FRP — 10-Year Cost Comparison
The material price comparison at the procurement stage hides the costs that emerge over a decade of service. The table below compares a 100-meter, 315mm diameter duct system serving electroplating exhaust (HCl + H₂SO₄ mist) over a 10-year period.
| Cost Category (10-Year) | PP Duct | Galvanized Steel | SS304 Stainless | FRP |
|---|---|---|---|---|
| Material (100m + fittings) | $4,200 | $3,400 | $4,800 | $5,200 |
| Installation labor | $3,800 | $7,200 | $7,600 | $6,400 |
| Supports + expansion joints | $2,200 | $4,500 | $4,800 | $3,800 |
| Duct replacement (10yr) | $0 | $6,800 (2 replacements) | $4,800 (1 replacement) | $5,200 (1 replacement) |
| Maintenance (sealing, patching) | $1,200 | $6,500 | $4,400 | $2,800 |
| Total 10-Year | $11,400 | $28,400 | $26,400 | $23,400 |
PP duct costs $800 more than galvanized steel on day one for materials, but saves $17,000 over 10 years — a 60% reduction in total cost. The largest savings come from eliminating duct replacement (steel corrodes through in 3–5 years) and reducing installation labor (PP is 60% lighter). For a detailed head-to-head material comparison including corrosion mechanisms, see our PP duct vs steel duct cost comparison.
Frequently Asked Questions
How much does PP duct cost per meter?
Standard round PP duct costs $12–180 per meter depending on diameter (100mm to 1,000mm), wall thickness, and UV stabilization. A typical 315mm UV-stabilized PP duct costs $32–45 per meter material-only, or $65–95 per meter all-in installed. See the price table above for diameter-specific ranges.
Is PP duct cheaper than stainless steel?
PP duct material costs 5–10% less than SS304 stainless steel duct for equivalent diameters. The larger savings come from installation labor (40–60% less for PP due to lighter weight) and lifecycle cost (PP eliminates the duct replacement that SS304 requires every 5–7 years in corrosive service). The 10-year TCO for PP is approximately 57% lower than SS304.
What factors most affect PP duct cost?
Four factors: diameter (larger costs more, non-linearly due to thicker walls), wall thickness (heavy-wall duct for high negative pressure costs 25–40% more), UV stabilization (+10–15%), and FR-grade flame retardant rating (+15–25%). Fittings typically add 40–60% to straight duct material cost for a typical system.
How much does PP duct installation cost?
Installation labor, supports, and accessories typically add 80–120% to the duct material cost, making total installed cost approximately 2× material cost. PP duct installation is 40–60% less expensive than steel because the lighter weight enables single-person handling and wider support spacing.
What is the lead time for factory-fabricated PP duct?
Standard round PP duct in diameters up to 630mm typically ships within 2–3 weeks. Custom rectangular duct, large-diameter duct (>800mm), and duct with integrated dampers or instrumentation ports typically requires 4–6 weeks. Factory-direct pricing applies regardless of order size.
Conclusion
PP duct costs 10–20% more than galvanized steel on material price but returns that premium many times over through lower installation labor (40–60% less due to 60% lighter weight), elimination of mid-life duct replacement (a $5,000–7,000 expense that steel incurs every 3–5 years in corrosive service), and reduced maintenance. Over a 10-year period, a PP duct system costs approximately $11,400 versus $23,000–28,000 for steel or FRP alternatives — a 50–60% reduction in total cost of ownership. All prices in this guide are 2026 factory-direct from Xicheng EP, with no intermediary markup. For a complete PP duct system design specification including layout drawings, sizing calculations, and material selection guidance, see our PP duct system design guide. Send us your duct layout, and we will return a line-by-line quotation with lead time.
Written by Corbin, a senior process engineer whose career has spanned over a decade designing and pricing industrial ventilation systems across three continents. Every price range and cost comparison in this article is drawn from actual 2026 factory-direct quotations and documented project close-out data from our 500+ completed installations.
