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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, 2014, the five-year average of gas unaccounted for = 0.8361%. The transportation loss factor = .99164, which is calculated by taking one minus the percentage of gas unaccounted for (1 - .008361 = .99164) rounded to 5 decimal places.

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