How do you change the filter in a Rudd Sihlouette II gas furnace?
turn off power to furnace and remove the bottom door to the
blower compartment,the filter should be on the right side of the
blower housing or it may be directly below the blower housing on
the bottom of the furnace depending on how your return duct is run.
hope this helps,FYI filters s/b replaced or cleaned every 30