Which factor is not considered when determining gas line sizing for an appliance?

When determining gas line sizing for an appliance, the primary factors include the length of the run, pressure drop, and appliance capacity.

The length of the run plays a crucial role because as the distance increases, the pressure can decrease, impacting the appliance's performance. Pressure drop is significant as it encapsulates the loss of pressure that occurs due to friction and other resistances in the gas line. This must be accounted for to ensure that the appliance receives the appropriate amount of gas for optimal operation. Appliance capacity is also essential because it indicates how much gas the appliance requires to function correctly, ensuring that the gas line can supply the necessary volume without any deficit.

On the other hand, ambient temperature is generally not a determining factor for gas line sizing. While temperature can affect gas density and, in some cases, appliance function, it does not directly influence the sizing of the gas line in the same way that run length, pressure drop, and capacity do. Thus, it is not considered a critical factor in the sizing calculation.