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A good rule of thumb is to check the filter once a month. Table 1 lists recommended filter sizes. Furnace Honeywell Lennox AC Air Filter 16x25x5 HVAC A furnace filter’s job is to remove contaminants from your indoor air and keep air flowing properly through your heating and cooling system. How to change furnace filter lennox . Keeping your furnace filter clean is an important aspect of home maintenance, especially if the furnace is older. Turn off your furnace before checking or replacing the filter. If furnace is located in the basement then filter is placed at furnace between intake ducts and blower motor. On your lennox hvac unit, the filter cabinet is located next to the air handler or furnace. Furnace filter maintenance/signs of need of change. This will prevent the furnace from turning on while you are checking or replacing the filter. Remove the existing filter and insert the new filter, following the direction of the arrows printed on the unit. Table 1 fur