I saw a video on youtube recently about that.....metal window screening and aluminum foil like what is on some building panels or an emergency blanket (like the foil faced ones you can fit in your pocket.) However, if you leave a gap, like a window or the floor then it can still pass through...
I saw a video on youtube recently about that.....metal window screening and aluminum foil like what is on some building panels or an emergency blanket (like the foil faced ones you can fit in your pocket.) However, if you leave a gap, like a window or the floor then it can still pass through...