IoT enclosures must hold RF, sealing, and assembly at once.

Design it as part of the radio, the power source and the seal, not as a shell drawn around a finished board. Plastic or metal in front of the antenna, a cell next to a keep-out, a gasket with no hard stop, and a programming header buried under a lid are enclosure decisions. They decide whether the product connects, whether it can be built twice, and whether a claimed environment is even testable.

The gasket arithmetic below is hypothetical teaching maths. It is not a seal rating, not an ingress result and not a BrahmWorks test. An ingress mark on a drawing is a wish until a named build is tested to a named method.