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Installing an air filter in the furnace is a fairly simple process that can be completed in a few steps. The first step is to remove the old filter and discard it. The next step is to measure the new filter to ensure that it is the correct size. Once the filter is Measure, the next step is to place the filter in the furnace and ensure that it is seated properly. The final step is to replace the furnace cover. 1.What you need to know before installing an air filter in the furnace Installing an air filter in your furnace... more