What's inside
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A closed-base router table needs two collection points. The router and bit throw chips below the tabletop, while the bit also sends fine dust and chips upward through the opening around the fence. A hose connected only to the cabinet can leave a visible plume above the table; a fence port alone lets most debris accumulate inside the base.
For most home shops, the practical setup is a 4-inch hose to the cabinet plus a smaller hose to the fence, connected with a branch fitting or a second port on the collector. If you can only connect one hose, collect at the source that produces the messiest work in your shop, and expect to sweep out the rest.
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What the system needs to capture
The router’s fan moves air around the bit, but it is not a dust collector. On edge-routing and groove cuts, some debris falls through the tabletop opening into the cabinet. The fence captures material thrown toward the back, especially on rabbets and other cuts that expose more of the bit. Neither port catches everything: small cutter openings, loose-fitting doors, and gaps around the base all reduce control.
A useful starting point is a 4-inch cabinet port and a 2½-inch fence port. Cabinet airflow matters most for the larger chips. The fence hose handles a smaller volume of finer debris near the cut. A typical 1½- to 2-horsepower dust collector may move roughly 500–800 CFM in real shop conditions, though hose length, filters, fittings, and leaks can bring actual airflow well below its advertised rating. A shop vacuum is convenient for the fence port but usually cannot maintain strong airflow through a long 4-inch run.
Compare the options
| Setup | Best for | Trade-off |
|---|---|---|
| Cabinet port only, 4-inch hose | General routing and chip cleanup inside the base | Fine dust can escape above the table |
| Fence port only, 2½-inch hose | Light edge work and a shop vacuum | Cabinet fills with chips; not a substitute for base collection |
| Cabinet plus fence, separate hoses | Frequent routing and the best overall capture | Needs two collection connections or a carefully sized branch |
| Cabinet plus fence on a branch | One collector and a compact setup | Airflow is divided; use blast gates to favor the active port |
Choose a collector and hose
For a router table used regularly, a single-stage dust collector with a 4-inch inlet is a sensible base. Look for a unit that accepts a 1-micron or finer filter, or plan to upgrade its bag or canister. A coarse collection bag can catch chips while allowing fine dust back into the room. If you already own a shop vacuum, use it on the fence port for occasional routing; it is the cheaper option and often captures well close to the bit, but it is not a good way to ventilate a leaky cabinet.
Compare duct layout, not just motor horsepower. A short, smooth 4-inch run with one or two bends usually beats a long, narrow hose with several adapters. Keep the cabinet branch short and avoid crushing flexible hose behind the table. For a fixed installation, 4-inch dust-collection hose and a blast gate make it easier to isolate the table when it is not in use. Add a 2½-inch line for the fence if your collector can support both ports, or use a branch and close the unused side when routing.
Do not assume a Y-fitting doubles airflow. The collector still has a fixed capacity, and opening both branches can weaken suction at each. Test with the bit and fence you actually use: a useful setup pulls chips toward the port instead of letting them spray past it. If the fence connection seems weak, close the cabinet gate briefly and compare; if capture improves, the branch is dividing too much airflow for that collector.
Seal the base without trapping heat
Seal obvious gaps in the cabinet with weather stripping or foam tape, particularly around doors and removable panels. A cabinet that leaks air from every seam pulls less through the intended opening. But do not make the base airtight: the router motor needs cooling air, and some router bases depend on airflow through their vents. Check the router manual and leave a deliberate intake path that does not aim dust toward the motor. Clean the router’s vents regularly; a sealed cabinet that overheats the tool is a failed solution.
A simple removable baffle around the router can help guide chips toward the cabinet port while leaving room for the motor and height adjustment. Keep it clear of moving parts, and check that it does not block access to the lift or collet. Avoid lining the cabinet with loose fabric or foam that can snag debris or obstruct airflow.
Set up the fence port
A fence port should sit close behind the cutter, usually centered on the opening. A 2½-inch port is common, but a smaller opening can clog on larger chips. Make sure the hose does not pull the fence out of alignment or interfere with the workpiece. If your fence has no port, a router-table dust-collection fence can be a straightforward upgrade; check that its opening suits your cutter size and fence system.
For cuts that leave the bit exposed, use the guard when practical and keep hands clear of the cutter. Dust collection does not make a router table safe to operate without proper guarding, push blocks, and eye and hearing protection.
Test and maintain the setup
Make a short test cut in scrap with the collector running. Check above the table under good light for a plume, then inspect the cabinet for piles of chips outside the airflow path. If dust escapes above, improve the fence pickup or reduce leaks around the fence. If chips remain in the cabinet, reposition the port or add a baffle. A thin line of dust on the table is normal; a cloud that hangs in the air is not.
Empty the collector before it is full, clean or replace filters as needed, and check hoses for packed chips. A clogged filter can quietly cut airflow enough to make an otherwise sound arrangement ineffective. For a shop where several tools run at once, consider a 1-micron dust-collector canister filter if the existing bag is coarse. The right upgrade depends on your collector’s size and fit; a filter cannot compensate for undersized ductwork or a leaking cabinet.