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Any one of the following methods shall be considered sufficient to provide proper ventilation to a room or space in which a gas meter(s) is installed:
  1. An opening to the outside air in the wall of such room or space, provided the free area of the opening is not less than 30 square inches (19 321 mm2).
  2. A duct or pipe having a cross-section area of at least 50 square inches (32 522mm2) of free area and a maximum length of 15 feet (4572 mm) leading to the outside air. However, under no circumstances shall the means of ventilation for the gas meter room or space be from an adjoining room or space within the building.

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