Max Heim wrote:
>I think the objection to residential garage pits is the fact that many
>attached garages also contain a gas water heater, gas dryer, or gas furnace.
>Any leaked gas would accumulate in the pit.
>A detached garage with no gas appliances would probably pass muster.
Natural gas is lighter than air, but propane and butane are (I think) heavier.
I'm not sure about petrol vapor.
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