Vent size and pattern control attenuation, not just airflow
A single large cutout lets air through but also lets RF energy through nearly unimpeded. Honeycomb vents or a grid of small round or hex holes give the same open area with far better attenuation, because each hole acts like a waveguide below cutoff once it is small relative to the wavelength being shielded against. Swapping one large cutout for a honeycomb or perforated pattern is usually the single biggest shielding improvement available without changing the enclosure material.
Every seam and access panel is a potential leak path
A shielded enclosure is only as good as its weakest gap. Doors, removable panels and seams that rely on paint or powder coat for the mating surface break electrical continuity right where it matters, since coatings are insulating. Conductive gasket or finger stock along the mating edge, with bare metal-to-metal contact underneath, keeps the seam electrically continuous instead of just mechanically closed.
Grounding the enclosure is a separate step from building it
A well-built enclosure with no path to system ground still radiates or picks up interference like an unshielded one. The enclosure needs a deliberate, low-impedance bond to system ground, not just a chassis screw that happens to touch a painted surface. Masking a ground-strap or ground-lug location before finishing avoids discovering after powder coat that there is no bare contact point left.
Coatings and fasteners can quietly undo shielding after the fact
Powder coat, anodizing and even some platings are electrical insulators, so a finish applied across a gasket mating surface or ground point defeats the shielding it was never meant to touch. Masking the specific contact areas before finishing, and confirming fastener torque actually compresses the gasket rather than just closing a visible gap, are both cheap steps that get skipped when shielding is not called out explicitly on the drawing.
| Input | Why it matters |
|---|---|
| Vent pattern | Honeycomb or small round/hex hole grids attenuate far better than one large cutout at the same open area. |
| Seam and panel gaskets | Conductive gasket or finger stock at doors and access panels keeps seams electrically continuous, not just mechanically closed. |
| Grounding point | A dedicated, low-impedance bond to system ground is a separate design decision from the enclosure build itself. |
| Coating masking | Powder coat, anodizing and plating are insulating and must be masked off gasket and ground contact areas. |
| Fastener compression | Confirm fastener spacing and torque actually compress the gasket, not just close a visible gap. |
Next step
Use the guide to prepare a cleaner inquiry, then attach the best available files through the RFQ form. If an item is unknown, say so directly so the first reply can separate quote assumptions from confirmed requirements.