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 having a cross-section area of at least 50 square inches (32 522 mm2) of free area and a maximum length of 15 feet (4572 mm) leading to the outside air. If a longer duct is required due to the building construction, the area of the duct should be increased accordingly, subject to the approval of the commissioner. 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.
The above requirement is not applicable to one- and two-family dwellings, since the gas meter is available for continuous supervision.
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 having a cross-section area of at least 50 square inches (32 522 mm2) of free area and a maximum length of 15 feet (4572 mm) leading to the outside air. If a longer duct is required due to the building construction, the area of the duct should be increased accordingly, subject to the approval of the commissioner. 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.
The above requirement is not applicable to one- and two-family dwellings, since the gas meter is available for continuous supervision.