[ansel12]

Gas can concentrate in lower areas like basements, air ducts, etc, and blow a structure sky high with nary a sniff of foul odor noticed.

You are wrong by the way, this is natural gas, not propane, natural gas wants to get away, not puddle, and it stinks to high heaven.

[cva66snipe]

I can see the potentials and understand the risk others may not because I'm a retired commercial building maintenance mechanic and gas fired boiler operator.

[cva66snipe]

You are wrong by the way, this is natural gas, not propane, natural gas wants to get away, not puddle, and it stinks to high heaven.

So was the home that blew up. It was on city NG service. Many things including barometric pressure determine how fast it rises, if it rises, or if it concentrates in lower areas.

[TChris]

You are wrong by the way, this is natural gas, not propane, natural gas wants to get away, not puddle, and it stinks to high heaven.

None of them smell like anything naturally. A malodorant is added (Ethyl Mercaptan) to natural gas make it smell bad.

[SC Swamp Fox]

natural gas wants to get away

I believe you are correct. When I was installing my CO/Flammable Gas alarm the instructions differed for propane and NG.

For propane they recommend that it be plugged into an outlet near the floor, for NG it included an extension cord and it recommend installation near the ceiling.