What impact does a dirty air filter have on a gas furnace?

Prepare for the Master Mechanical License Test with flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get confident for your exam!

A dirty air filter in a gas furnace primarily decreases airflow and efficiency. When the filter becomes clogged with dust, dirt, and other particulates, it obstructs the flow of air through the furnace. This reduced airflow means that the furnace has to work harder to pull in air for combustion and heating, which can lead to inefficiencies in the system.

As the airflow decreases, the heat exchanger may not receive sufficient air to transfer the generated heat effectively throughout the space, potentially causing uneven heating within the home. Not only does this lead to increased energy consumption, but it can also result in the furnace cycling on and off more frequently, which places additional strain on the system, potentially shortening its lifespan and requiring more frequent maintenance.

Moreover, decreased airflow can lead to issues such as overheating of the system and even safety concerns if the combustion process is affected. Therefore, proper maintenance, including regular replacement or cleaning of air filters, is crucial for ensuring the furnace operates efficiently and safely.

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