Faraday cages do not need to be solid walled containers. Your microwave oven has a mesh screen on the door and that keeps the 2.45 GHz waves inside it. Yes they do have some leakage, but it's due to the fact that you can open and close the door and that some emission is coming from the wiring and components outside of the cage. Consider that the leakage is very low even though the power output could be over 1200 Watts. A WiFi router doesn't come anywhere close to that kind of power output.
Edit: Better still, just put the WiFi antenna in the cage. You can use a WiFi router that can take an external antenna and that will solve you heat problem immediately.
Yeah I was thinking a filter might be what one wants. Light and "WiFi" RF are both radiation of the same fundamental type... they are different frequencies.
And most plants will grow like crazy when given UV light (UVA, some UVB). The whole notion of RF/EMF radiation causing harm is unfounded without going through extreme measures to cause harm. Vegetation grows just fine near cell phone, radio, TV, WiMAX and satellite broadcast antennas and towers. They have been around for a long time now. You think that if there was anything real to this exposure that it would have surfaced by now.
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