Usually the filter is inside the heater housing. You remove the heater access door which should have a safety switch that opens when you remove the panel, thereby removing power from the electrical system on your unit. The filter, if there is one will be below the fan motor on an upflow heater.You should be able to see the filter when you open the heater access panel.
There should also be a filter in your return air duct or at the grille. The sizes of the filters are usually on the side of the filters.
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