[Caipirabob]

Just pointing out the obvious defect in the stupid design.

I've seen designs including proximity alarms, periscopes and flame throwers.

I would have to image people who had less money for such installations may not have adequate defenses. However there are many who would have some truly nasty surprises in store.

Besides, I think the tendency would be towards concealing an air vent. If it's raised, perhaps bushes or weeds would be adequate concealment.

Regardless, let's pray theory is never put to test.

[Joe 6-pack]

" I think the tendency would be towards concealing an air vent. If it's raised, perhaps bushes or weeds would be adequate concealment."

There's a Hoganesque solution that dates back to WWI...

Observer's Post of Sheet Metal Resembles Tree