Honeycomb shielding vents

Honeycomb vs. Metal Mesh – Which Shielding Vent Actually Works?

If you've been around shielding vents, you've seen both. Cheap wire mesh. Fancy honeycomb. They look similar from across the room. But the performance gap? Massive.

I've tested both in our shop. Here's what the numbers actually say – and what that means for your equipment.

Shielding – This Is Where Honeycomb Kills Mesh

A metal mesh vent at 1 GHz? Maybe 10‑20 dB. At 5 GHz? Almost nothing. The gaps between the wires act like little antennas. RF walks right through.

Honeycomb works different. Each cell is a waveguide. RF above cutoff bounces off the walls and dies. A good honeycomb vent gives you 60‑90 dB at 1 GHz. Some hit 80‑120 dB.

At 5 GHz, the gap is about 40 dB. That's 10,000 times more signal blocked by honeycomb.

What that means: If you're near a cell tower, a radar, or any serious transmitter, mesh won't cut it. Honeycomb will.

Airflow – The Surprise

People assume mesh flows better because it's thinner. Not really.

A good honeycomb vent has 80‑95% open area. Straight cells, laminar flow, low pressure drop.

Mesh? Woven wires create turbulence. Higher pressure drop. And if you use a fine mesh to get better shielding, you choke airflow even more.

What that means: For the same shielding performance, honeycomb often flows more air. Fans work less. Gear runs cooler.

Durability – Mesh Is Fragile

Honeycomb is a solid block. Aluminum or steel. Resists vibration, shock, dents. You can open and close a cabinet door every day. It won't tear.

Mesh? Snags. Tears. Compresses. A maintenance guy leaning on it bends it out of shape. Once it's bent, shielding is gone.

What that means: For equipment that gets handled or moved, honeycomb lasts. Mesh is a headache.

Corrosion – Mesh Rots Faster

Honeycomb can be plated – nickel, tin, silver. Stainless handles salt spray. Aluminum with chem film survives humidity.

Mesh corrodes at wire intersections. Dissimilar metals create galvanic corrosion. Plating wears off at contact points.

What that means: In coastal or industrial environments, honeycomb lasts years. Mesh needs replacement in months.

Sealing – Hard to Seal Mesh

Honeycomb comes in a rigid frame with a conductive gasket. Bolt it on, it seals.

Mesh is flimsy. Edges don't seat well. Gaskets don't sit right. RF leaks around the frame.

What that means: A poorly installed mesh vent leaks more than the holes themselves. A properly installed honeycomb vent seals.

Cost – Mesh Wins Here

Mesh is cheap. Buy it by the roll.

Honeycomb costs more. Stacking, brazing, plating, framing – it takes work.

What that means: If you're building a cheap consumer product with no serious EMI threat, mesh might be fine. If you're protecting critical gear, honeycomb is worth the extra money.

Bottom Line

Honeycomb beats mesh at high frequencies. Better shielding. Better airflow. Better durability. Better sealing.

Mesh is for cost‑sensitive, low‑frequency stuff. Honeycomb is for when it matters.

If your equipment is near a tower, a radar, or any serious RF source, spend the money on honeycomb. The performance gap isn't small – at 5 GHz, it's about 40 dB. That's the difference between passing EMC and failing. Between reliable operation and random glitches.

We make honeycomb vents. We've tested them against mesh. We know what works.