Method for forming a glass article

A method of manufacturing a glass article, comprising:

• flowing a molten material through a first vessel to a second vessel downstream from the first vessel, the molten material flowing through a conduit connecting the first vessel to the second vessel, the first vessel and the conduit defining a continuous free volume above a free surface of the molten material, the free volume extending into at least a portion of the conduit;
• and
• venting a first atmosphere contained in the free volume to a second atmosphere external to the first vessel through a vent tube comprising a proximal end, a distal end opposite the proximal end, and a passage extending between the proximal end and the distal end, the proximal end connected to the conduit proximate a top of the conduit and above the free surface, the vent tube extending downward and away from the conduit along a longitudinal axis at an angle α relative to horizontal and providing fluid communication between the first atmosphere and the second atmosphere,
• wherein a first portion of the conduit extends horizontally from the first vessel and the vent tube is connected to the first portion of the conduit, and
• wherein at least a second portion of the conduit extends and slopes downward from the first portion of the conduit at an angle β relative to horizontal.