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I know what your thinking, this poor person had to pay me an afterhours service call fee just to replace a $2.00 air filter. but you would be wrong. This poor person had to pay me for 2 full hours at double time because his blower motor burned out due to the added stress caused by this dirty $2.00 air filter. Blower motors burn out, I can't say for sure it would not have burned out even if a clean filter was installed every month, but a dirty air filter does shorten the life of a blower motor, it also causes the heat exchanger to stay hotter then it needs to for a longer period of time that it needs to, shortening the life of the furnace. Keep your furnace clean and change your air filter regularly.