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For residential, the homeowner can do the job themselves, but a commercial job requires a contractor.

Absolutely not as the codes in many civilized parts of the globe realizes that gas can be highly dangerous and it doesn't matter if it is residential, ,institutional commercial or industrial.A Gas fitters or master plumbing license is requiredThe typical lay person has no clue to the proper sizing of gas lines based on the total BTU input of the appliances or the specific gravity of the fuel (natural gas) or the allowance for the developed length or piping and fittings.
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Q: Do gas lines have to be installed by a professional?
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