What's inside
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Why Build a Bench-Top Dust Hood?
Small routing jobs create a disproportionate amount of dust. A trim router or compact plunge router can throw fine particles in every direction, especially when rounding edges, cutting dados, or trimming laminate. A full-size router table enclosure is useful, but it takes up space and is inconvenient for one-off work.
A bench-top dust hood is a small enclosure that surrounds the cutter area while leaving enough room to move the workpiece. Connected to a shop vacuum, it captures much of the dust at the source. It will not replace a proper respirator or general shop cleanup, but it can keep a small routing job from coating your bench, floor, and lungs.
The design below is sized for handheld routing on narrow boards and small panels. It is not intended to enclose a router table or contain large workpieces.
Materials and Tools
Use clear or translucent material for the sides so you can see the bit and workpiece. A 1/8-inch sheet of polycarbonate is a good choice because it resists impact better than acrylic. Acrylic is cheaper and easier to find, but it can crack around drilled holes. For a budget build, 1/8-inch plywood sides work, although visibility is worse.
- One 12-by-18-inch piece of 1/2-inch plywood for the base
- Two side panels, about 5 by 8 inches
- One rear panel, about 8 by 8 inches
- One 2-1/2-inch dust port or hose adapter
- Four 1-1/4-inch wood screws
- Silicone caulk or weatherstripping
- Two clamps or toggle clamps
- Drill, jigsaw, countersink bit, and screwdriver
A 2-1/2-inch dust collection hose adapter is usually the simplest way to connect the hood to a shop vacuum. Check your vacuum’s hose diameter before buying. A reducer that leaks badly will cancel much of the benefit.
Design and Dimensions
Cut the base to roughly 12 by 18 inches. The exact size is not critical, but the base should be large enough to sit flat without rocking and long enough to support the workpiece on both sides of the cutter. Round over the front corners so they do not catch on the edge of a board.
Install the side panels along the long edges of the base, leaving a front opening of approximately 4 inches. Make the rear panel removable or leave a gap around the hose connection. The hood only needs to surround the cutting zone; sealing every edge can actually make it harder to position the router.
Cut a 2-1/2-inch hole in the rear panel, centered about 2 inches above the base. Aim the port slightly upward rather than directly at the workpiece. A direct blast of suction at the cut can pull chips across the bit and interfere with the router’s movement.
Keep the hood opening at least 1 inch away from the largest bit you plan to use. For common edge-rounding work, a 3- to 4-inch-wide opening is enough. If you use large panel-raising or joinery bits, build a proper router table guard instead of trying to adapt this small hood.
Assembly Steps
Sand the plywood edges and dry-fit the three panels on the base. Mark the screw locations, drill pilot holes, and countersink the heads. Fasten the sides and rear panel from underneath where possible. This keeps screw heads away from the workpiece.
Seal the inside corners with a thin bead of silicone caulk. Do not try to make the enclosure airtight; the goal is to prevent large leaks that reduce airflow. Add a strip of adhesive weatherstripping under the base if the hood sits on a smooth bench. On a rough plywood bench, the strip may make the hood slide instead of seal.
Attach the hose port with screws or epoxy, depending on its design. If the port is loose, wrap the connection with foil HVAC tape. Ordinary duct tape often releases its adhesive when exposed to fine dust and vibration.
For a faster setup, add two small toggle clamps to the base. They keep the hood from shifting when the hose pulls sideways. Alternatively, clamp the rear edge to the bench, but keep clamps clear of the workpiece path and router cord.
Dust Collection Options Compared
| Collection setup | Best use | Advantages | Limitations |
|---|---|---|---|
| Shop vacuum with pleated filter | Small routing and trimming jobs | Strong suction, compact, easy to move | Filter clogs quickly with fine dust |
| Shop vacuum with cyclone separator | Frequent routing and sanding | Protects the vacuum filter and maintains airflow | Costs more and takes extra floor space |
| Dust extractor with automatic outlet | Regular power-tool use | Better filtration, hose control, tool switching | Higher purchase price |
| Shop dust collector | Router tables and stationary machines | Moves more air through larger ducts | Usually awkward for a small portable hood |
For occasional work, a shop vacuum is fine. Use a replacement HEPA shop-vac filter if your vacuum accepts one, and clean it according to the manufacturer’s instructions. A clogged filter can reduce suction enough that the hood only catches the largest chips.
If you route often, put a shop-vac cyclone dust separator between the hood and vacuum. This is usually a better upgrade than buying a larger vacuum. The separator catches heavy chips before they reach the filter, though very fine dust still passes through.
Using the Hood Safely
Test the hood with the router unplugged. Turn on the vacuum and hold a scrap of paper near the opening. It should pull inward without collapsing against the port. If the vacuum sounds strained or the paper sticks hard to the opening, increase the opening size or add a small relief gap.
Keep the router base outside the hood unless the enclosure was specifically designed for that router. The hood should contain chips, not restrict the tool’s handles, depth adjustment, or power switch. Always unplug the router before changing bits or reaching inside the enclosure.
Feed the router against the bit’s rotation, just as you would without the hood. A hood that catches dust is not a guard against kickback. Clamp small workpieces securely, support long boards, and keep both hands on the router when possible.
Fine routing dust can remain airborne after the cut. Wear a properly fitted respirator rated for particulates, and provide general ventilation. Do not use the hood with a vacuum that vents visibly dusty air back into the room. Stop if the hose becomes blocked, the hood shifts, or the workpiece starts rubbing the enclosure.
Common Failures and Improvements
The most common failure is poor visibility. Opaque plywood sides make it hard to judge the cut and encourage users to lean closer to the bit. Replace the front side panels with clear polycarbonate if you regularly work close to an edge.
The second failure is an undersized base. If the hood rocks or the workpiece hangs over an unsupported edge, the router can tip. Add a wider base or a sacrificial extension wing rather than tightening the clamps harder.
Finally, do not overbuild the enclosure. A sealed box with a tiny slot often performs worse than a partially open hood because the vacuum cannot move enough air. A 3- to 4-inch opening, a short hose, and a clean filter generally matter more than thicker panels or elaborate joints.