Magnetic Shielding: Flickering Screens in Offices Near Transformers
Low-frequency magnetic fields cannot be stopped by ordinary shielding. We explain how magnetic shielding is done.
3 min readJuly 8, 2026
Why the Door?
Walls are fixed, but the door is opened and closed dozens of times a day. As the gaskets wear, signals start leaking around the door.
That is why the room's overall performance is often limited by the door's performance.
Door Types
Manually operated hinged doors are common in small and medium rooms. Large test chambers use sliding or automatic doors with pneumatic sealing.
The door size is set by the largest piece of equipment that will enter the room.
Maintenance
Door gaskets should be cleaned regularly and replaced when worn. Annual testing reveals a drop in door performance early.
With proper maintenance, a shielded door keeps its day-one performance for many years.
Think Door and Gasket Together
Door selection can't be separated from the gasket type. Double-row finger stock stands out for high performance at high frequencies, while durable, easy-to-maintain solutions suit doors used often.
We explained the gasket types in detail in our RF gasket types article. To keep the door performing for years, see our maintenance schedule recommendations.
Frequently Asked Questions
Can automatic doors be used on shielded rooms?
Yes. Pneumatic or electrically driven shielded doors are preferred especially in heavily used labs.
How often should the door be adjusted?
At least once a year, depending on how heavily it's used.
Are accessible shielded doors available?
Yes. Threshold-free or low-threshold shielded door solutions exist.
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