What's inside
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Flexible hose is useful in a dust-collection system, but it is usually a poor choice for long, fixed runs. Its ridged interior adds resistance, and sagging hose can collect chips. For a permanent main trunk, smooth-wall metal duct is generally the better choice. A short hose at a machine still makes sense where movement or vibration calls for it.
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Where each material fits
Think of the system in two parts: fixed duct that carries air around the shop, and short connections that let you move or service a tool. Metal duct suits the fixed sections. Flexible hose suits machine drops, mobile tools, and awkward final connections.
For many one-person shops, that means a metal main trunk along a wall or ceiling, with branches to machines and a short flexible connector at each port. A small shop with one mobile collector and tools that get moved around may reasonably use more hose. It is cheaper and easier to rearrange, though you give up airflow and a tidy permanent layout.
Metal duct vs flexible hose
| Factor | Metal duct | Flexible hose |
|---|---|---|
| Airflow resistance | Lower with smooth walls and gentle fittings | Higher, especially when corrugated, stretched poorly, or bent tightly |
| Installation | More measuring, supports, and fitting work | Fast to cut and route around obstacles |
| Layout changes | Less convenient to move | Easy to reposition or disconnect |
| Chip buildup | Less likely in a smooth, properly sloped run | More likely in sagging sections and deep corrugations |
| Best use | Fixed trunk lines and permanent branches | Short machine connections and mobile equipment |
Airflow, diameter, and run length
Duct diameter matters, but so do total length, elbows, branch fittings, and the collector’s ability to move air against resistance. A long run of small hose can leave a machine with weak capture even when the collector’s advertised airflow looks adequate. As a practical starting point, many small-shop tools use a 4-inch port; larger machines may need a 5- or 6-inch connection. Match the duct to the machine and collector rather than assuming one size fits every port.
Avoid reducing a trunk just to fit a smaller tool port until the branch or final connection. Keep runs as direct as the shop allows, use swept elbows where possible, and limit unnecessary bends. Flexible hose should be pulled taut and kept short; a loose loop or tight bend can cost more airflow than its length suggests. Check the collector and tool manuals for required duct sizes and minimum airflow, since machine needs vary.
Choosing and installing metal duct
For a fixed system, look at smooth-wall sheet-metal duct and compatible fittings sized for dust collection. A dedicated dust-collection metal duct and fitting kit can simplify a small installation. HVAC duct may be cheaper, but thin pieces can dent, leak at poorly joined seams, or lack fittings suited to a shop layout. Check wall thickness and the joining method before buying.
Support horizontal runs regularly so they cannot sag or pull apart; follow the duct maker’s spacing guidance, and add supports near heavy fittings and branches. Seal joints with a product intended for duct seams, and orient any seams or joints so chips are less likely to catch. Do not use screws that protrude far into the airflow path: they can snag debris. Grounding and bonding requirements depend on the system and local electrical rules, so do not assume that a metal duct alone makes the whole installation safe from static-related ignition.
When hose is the sensible choice
Flexible hose is the practical option for a bench tool that moves, a floor-sanding attachment, or a short connection that must absorb vibration. It is also reasonable for a temporary setup or a low-use tool when the cost and effort of rigid duct are hard to justify. If your collector is modest and the run is short, a few feet of hose may perform adequately.
Buy hose that matches the port and intended dust-collection use; avoid narrow general-purpose vacuum hose for a large woodworking port. A 4-inch dust-collection hose is a common choice for compatible shop tools. Keep it from crushing underfoot, hanging in deep loops, or rubbing against sharp edges. Inspect it for splits and loose cuffs, since leaks can reduce capture and spread fine dust around the shop.
Common failures and fixes
A frequent mistake is using flexible hose for the entire system because it is easy to route. The system may run, but long corrugated sections, sharp turns, and low spots raise resistance and give chips places to settle. If a tool captures poorly, first check for a clogged filter, full collection bag, closed blast gate, crushed hose, or loose joint. Then review the duct route and size before buying a larger collector.
Another failure is adding too many branches without closing unused ones. A blast gate on each branch helps direct airflow to the tool in use; a gate that sticks open can weaken suction at the active machine. Keep gates accessible and clear chips from them when needed. For a short, movable connection, use a blast gate sized to the branch, and verify its inside opening does not create a major restriction.
Make the choice around your shop
Choose metal duct for the permanent backbone if the tools and collector will stay in place and you want fewer restrictions on long runs. Reserve hose for the last few feet, mobile tools, and connections that need movement. If the shop layout changes often or the system is temporary, hose is a defensible budget choice: keep runs short, supported, and easy to inspect. Before purchasing fittings, sketch the route, note each port diameter, count elbows and branches, and check the collector’s performance information. Those steps prevent more airflow problems than simply buying the largest duct that fits.