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Normally the filter wail be in the blower compartment, but often the installer will install a filter grille in ceiling or wall instead.
I will find a photo of furnace showing where to look in furnace
Not finding a real good picture showing filter location but it should be in the return end of the furnace,Can be in bottom,top or end as highlighted.Remove the front cover to access .Otherwise installer may have installed filter grille as mentioned or an electronic air cleaner.Let me know if you find it here.
PLease do not open another question Reply here. Filter rack will most likely be mounted on outside of cabinet.
See below for side entrance example
Below sows bottom installed
Link below shows the filter rack installation.If your installer did not install a filter grille, it should be on one side or end of furnace.
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