When Does it matter if a gas heater fan blower is wired reverse polarity?

It matters if the gas heater fan blower is wired with reverse polarity because it can cause the motor to run in the wrong direction, resulting in inefficient air circulation or overheating. This can also potentially lead to damage to the motor or the electrical components of the heater. It is important to have the blower wired correctly to ensure the proper functioning and safety of the gas heater.