If you work with dust extractors, shop vacs, or portable dust collection systems, you’ve probably asked: “How long can I run my hose before I lose too much suction?” The short answer is that there’s no fixed universal number — longer hoses lose airflow, and that loss isn’t linear. It compounds fast as hose length increases and diameter decreases.
This guide breaks down the physics behind hose-related suction loss and gives practical, field-tested guidelines from the BERSI engineering team so you can size your hose setup correctly the first time.
Why Does a Longer Hose Reduce Suction?
As air moves through a hose, it rubs against the interior walls, creating friction loss. Every additional foot of hose consumes some of the static pressure and CFM (cubic feet per minute — the actual airflow that carries dust and debris) your extractor’s motor produces.
For example, a dust extractor rated at 150 CFM at the port might only deliver 90–100 CFM by the time air travels through 15–20 feet (roughly 4.5–6 meters) of hose to reach the sander or tool.
Three factors determine how much airflow you lose:
1. Hose Length
Losses increase with distance, but because the motor has a fixed pressure budget, the practical effect is worse than a simple linear relationship — especially past a certain length, where suction drop-off accelerates noticeably.
2. Hose Diameter (the biggest factor)
This has the largest impact by far. Cutting hose diameter in half doesn’t cut airflow in half — it can reduce it by 75% or more, because flow resistance scales with the fourth power of the radius (similar territory to Poiseuille’s law, even though airflow in a dust extractor isn’t perfectly laminar). Step a 2.5″ port down to a 1″ hose, and the system will be choked no matter how short the run is.
3. Bends, Couplers, and Fittings
Every elbow, quick-connect, and reducer adds resistance equivalent to several extra feet of straight hose. A hose coiled tightly also creates more resistance than the same hose laid out straight.
Practical Hose Length Guidelines
| Hose Length | Airflow / Suction Performance | Best For |
|---|---|---|
| Up to 10 ft (~3 m) | Negligible loss, near full-rated airflow | Sanding, precision work requiring maximum suction |
| 10–16 ft (~3–5 m) | Minor loss, usually acceptable | Fixed workstation use with 1.25″–1.5″ antistatic hose |
| 16–25 ft (~5–8 m) | Noticeable loss, especially if the hose necks down to a smaller diameter (e.g., 27mm sander ports) at the tool end | Mid-range mobile work; diameter matching becomes critical |
| Beyond 25–30 ft (~8+ m) | Most single-stage shop vacs and compact extractors struggle significantly, with reduced suction and static buildup | Switch to a fixed dust collection system with rigid main ducting and a short flex-hose drop to the tool |
How to Minimize Airflow Loss on Long Runs
- Use the largest hose diameter your tool port allows, and only step down to a smaller diameter right at the tool.
- Keep the narrow “whip” section as short as possible. Sanders and routers often require a smaller-diameter hose at the connection point — limit that section to a few feet, not the entire run.
- Avoid coiling excess hose. Loops and coils add measurable resistance; lay hose out as straight as practical.
- Choose smooth-bore hose over corrugated hose. At the same diameter, smooth-bore hose has noticeably lower resistance because corrugation ridges create turbulence.
- For runs beyond 25–30 feet, consider a fixed system: rigid or semi-rigid main ducting for the bulk of the distance, with only a short flexible hose connecting to the tool. This is standard practice in industrial dust collection and performs far better than relying on a long flexible hose from a portable extractor.
How BERSI Matches Hose to Extractor
Every BERSI extractor ships with a hose sized to balance flexibility, tool compatibility, and airflow retention for its intended use case:
| Model | Extraction Port | Standard Hose | Notes |
|---|---|---|---|
| AC150H | 50 mm | D35 × 4 m | Compact hose for close-range, precision tool work |
| TS1000 | 50 mm | D38 × 5 m | Slightly larger bore for extended reach with less drop-off |
| Other single/twin-motor models (e.g. AC21/AC22) | 70 mm | D50 × 7.5 m | Standard workshop-length hose matched to a wider port for stronger sustained airflow |
| 3-motor extractors (e.g. TS3000) | 70 mm | D50 × 7.5 m standard, plus an additional D63 × 10 m main hose | The larger-bore extra hose extends reach for longer runs while preserving suction before stepping down to the tool |
| 3-phase extractors (e.g. AC900) | 70 mm | D50 × 7.5 m standard, plus an additional D76 × 10 m main hose | The widest-bore extra hose is built for the highest-CFM applications and longest runs, minimizing loss over distance |
A quick way to read this table using the principles above: on the AC150H and TS1000, the hose bore is intentionally narrower than the port to keep the hose light and maneuverable for handheld tool work over short distances — the kind of use case where the length-related loss discussed earlier stays negligible. For 3-motor and 3-phase machines, which are typically used for longer runs or higher-volume extraction, BERSI includes a large-bore extra hose specifically so the main line doesn’t become the bottleneck: 3-motor extractors get a D63 × 10m main hose, while 3-phase extractors — built for the highest airflow demands — step up further to a D76 × 10m main hose. Either way, you get the airflow-preserving benefit of a wide “trunk” line, with a smaller hose only where it’s needed at the tool.
The BERSI Recommendation
Hose length can’t be chosen in isolation — it has to be balanced against your extractor’s motor airflow, hose diameter, and tool port size. BERSI dust extractors and hose accessories are engineered with this airflow-length-diameter balance in mind, so users get consistent suction across real-world working distances. Browse the full single-phase HEPA dust extractor range or three-phase industrial vacuum range, or contact BERSI technical support — we can recommend the right setup based on your extractor model, hose diameter, and working distance.
Frequently Asked Questions
Q: What’s the maximum length for a dust extractor hose? There’s no single answer — it depends on motor airflow and hose diameter. As a general rule, keep portable extractor hoses under 25–30 feet to maintain usable suction. Beyond that, a fixed dust collection system is a better choice.
Q: Does a smaller hose diameter really reduce suction that much? Yes, and more than most people expect. Cutting hose diameter in half can cut airflow by 75% or more — diameter is the single biggest factor in hose selection, often more important than length.
Q: Do bends and coiled hose actually affect suction? Yes. Every bend, elbow, and tight coil adds resistance equivalent to extra feet of hose. Laying the hose straight and minimizing sharp bends helps preserve airflow.
Q: Is smooth-bore hose better than corrugated hose? At the same diameter, smooth-bore hose has less internal friction and less turbulence than corrugated hose, resulting in better airflow retention over distance.
Q: What should I do if my work distance is over 25 feet from the extractor? Use a fixed dust collection setup: rigid or semi-rigid main ducting for most of the distance, and only a short flexible hose drop at the tool end. This preserves airflow far better than one long flexible hose.
Q: Which hose comes standard with BERSI extractors? It depends on the model. The AC150H (50 mm port) ships with a D35 × 4 m hose, and the TS1000 (50 mm port) ships with a D38 × 5 m hose — both sized for close-range precision work. Other single/twin-motor models with a 70 mm port ship with a D50 × 7.5 m hose. BERSI’s 3-motor extractors additionally include a D63 × 10 m main hose, and 3-phase extractors include a D76 × 10 m main hose, both for longer runs and higher-CFM applications.
This article was written by the BERSI technical team, based on fluid dynamics fundamentals and practical field testing. For specific equipment specifications, always refer to your product manual.
Post time: Sep-10-2026