You don't, it is always specified in the installation instructions that come with the gas appliance. Of more importance is the material(s) used in the piping, everything must be compatible with the type of gas and the local codes.
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“Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
Toward the end of this article it mentions 1/4 psi (~7" water column) pressure; I've also seen 10" w.c., but local Codes might vary. Be sure to check those, because they will govern the allowable pressures in various types and locations of pipe/tube/hose.
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Get a registered professional to install it, particularly if the home's fire insurance policy is worth the premium.
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Figuring Gas Line Pressure
Re: Figuring Gas Line Pressure
