DO NOT USE STORM SAFE,I have an in the garge floor shelter installed by them in 2004 that is rusting through and they refuse to honor the lifetime warranty
Natural gas is lighter; propane is heavier.
Not sure what your budget is but check out Aaron's Shelters on okc. It's a family owned that has been around for decades. They install patio top shelters that provide you a concrete room underground with 6'8" of headspace. Smallest room is 8x8 for around $6k.
We had an in ground patio type shelter built a few years ago by Aaron's in OKC. If I remember correctly it's 8x11 on the inside. We have quite a bit of stuff stored down in the 'bunker'. I had it built about 60' from the back of the house. I usually keep it locked until the weather starts getting predicted to be ugly. It was cast in place all in one piece and has had no problems so far.
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