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Look for the Blue Star seal when buying a gas appliance.  It certifies that the equipment design meets strict safety standards.
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Current Loss Factor

Effective January 1, 2015, the five-year average of gas unaccounted for = 0.7870%. The transportation loss factor = .99213, which is calculated by taking one minus the percentage of gas unaccounted for (1 - .007870 = .99213) rounded to 5 decimal places.

For billing purposes, the transportation loss percentage/factor changes on a calendar year basis.