Blowing unburned propane vapor into the atmosphere through an orifice larger than a _______ drill size (orifice) is against fire safety and/or environmental codes.

Blowing unburned propane vapor into the atmosphere through an orifice larger than a #54 drill size is against fire safety and/or environmental codes because it significantly increases the potential for fire hazards and environmental contamination. Propane is highly flammable, and even small leaks can create dangerous situations.

The orifice size, designated by drill sizes, indicates the dimension of the opening through which propane can escape. If the orifice is too large, it could allow an excessive flow of propane, leading to a higher risk of ignition and catastrophic events. Therefore, the specified limit of #54 drill size serves as a safety measure to minimize the amount of unburned propane that can escape, helping to prevent fires and protect the environment. Compliance with these standards ensures that any release of propane is managed safely and responsibly.