Guide · Dust-collector hose
Dust hose length and diameter: what the evidence shows
What one documented home-shop experiment and the EPA say about hose choice, collectors vs shop vacs and cyclone resistance, and which figures we will not publish.
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Short answer
Hose choice can matter, and in the one documented home-shop experiment we found it mattered more on a low-pressure dust collector than on a high-suction shop vac. We found no standard figures for hose length or diameter, so this page gives the direction of the evidence, not numbers. For limits on your own machine, follow the collector or separator maker's manual.
The one experiment we found
Woodgears, a home-shop site, measured inlet airflow with an anemometer over a 12 cm hole in a cardboard box. The author ran a shop vac, a 1 hp dust collector and a homemade collector, with 4-inch and 2.5-inch collector hose, standard shop-vac hose, pool hose and central-vac hose.[1]
Woodgears reports that hose choice affected airflow much more on the tested dust collectors than on the tested shop vac, which had far higher static suction.[1]
That is one experimenter with specific equipment. We report the direction of the finding and its method. We do not reproduce its airflow figures or its equivalent-length numbers, because nothing shows they hold for other machines or hoses.
Why the machine type matters
In general terms, a shop vac is built to pull hard through a small hose, while a single-stage dust collector is built to move air through a large one. Woodgears' note that its shop vac had far higher static suction fits that picture. It is a description, not a rule you can calculate with.
Cyclones add resistance too
Every part in the path adds resistance, not only the hose. The EPA notes that high-efficiency cyclone designs that capture finer particles require a higher pressure drop.[2] That is industrial air-pollution guidance, not a rating for any home-shop separator, but it explains why adding a separator changes how the rest of the system behaves.
When a separator bucket collapses
Dustopper's FAQ attributes bucket collapse to too much airflow restriction, such as very long or small-diameter hoses.[3] That is Dustopper's explanation for its own separator. We do not publish any fix that involves drilling or modifying reducers, buckets or separators. Why separator buckets collapse covers the bucket guidance the makers do give.
Maker airflow claims without data
Some makers claim a fitting improves airflow. POWERTEC's copy for its 70147 tapered adapter claims increased air flow and velocity, but the page gives no test data or method.[4] We treat claims like that as unverified.
What we will not publish
| Claim | Why not |
|---|---|
| Airflow per foot of hose | No source in our register measures it in a way that applies beyond one setup |
| "Equivalent length" tables | Same reason; Woodgears' numbers are specific to its equipment |
| Magazine meter readings | We could not verify the figures we were pointed to |
| A maximum hose length | No source in our register sets one; follow the collector maker's manual |
Choosing hose length in practice
Buy the length your layout needs, and read the collector's manual for any limit it gives. We have no airflow figure for the hoses below, so choose by length and end fit only.
Picks that fit2 products
Choose the 4 in x 10 ft 70111 or the 4 in x 20 ft 70143V by the distance from your collector or drop to the machine.
More on choosing
On Amazon, check that 'Ships from / Sold by' shows Amazon.com or POWERTEC.
Short 4 in run, left-hand spiral
POWERTEC 70111 4 in x 10 ft clear flexible PVC dust collection hose, left-hand spiral
Longer 4 in run, left-hand spiral
POWERTEC 70143 4 in x 20 ft clear flexible PVC dust collection hose, left-hand spiral
Next
Questions
Does a longer dust hose reduce suction?
Hose choice can matter. Woodgears reports that hose choice affected airflow much more on the tested dust collectors than on the tested shop vac; it is one experimenter's equipment, so we give no figures.[1]
Is a 2-1/2-inch hose OK on a dust collector?
Woodgears included 2.5-inch collector hose in its experiment and found hose choice mattered more on the collectors than on the shop vac. Follow your collector maker's manual for the hose it names.[1]
Why does my separator bucket collapse with a long hose?
Dustopper's FAQ attributes bucket collapse to too much airflow restriction, such as very long or small-diameter hoses. Use the bucket the separator maker names, and ask the maker before changing anything.[3]
How long can a dust collector hose be?
No source in our register sets a limit. Follow the collector maker's manual.