30 inch is where a balloon stops being decoration and becomes signage. It is the size shops use in a window and event suppliers use behind a stage, because a number or a character at this scale reads from the other side of the street.
Around 1–1.3 cu ft of helium and about seven days of float. At this size film thickness matters more than at 18 inch — a thin film looks dull through the window after two days, so we run 0.07 mm on the large dies as standard.
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