How / where do I change the filters for my American Standard Freedom 80 furnace and humidifier?

Depending on the type of air flow for your American Standard Freedom 80 determines where the filter would be located. For upright upflow models the filter can be internal bottom of the unit or an external rack on the side. For upright counterflow models the filter may be located in the return ductwork.

If you’re not sure if you have an upflow or counterflow model, this article
can help explain the difference.

If you still have questions, the owner’s manual has pictures and instructions for changing your filter starting on page 4.

See the chart below for the correct filter size for the American Standard Freedom 80. This chart matches the correct filter by the width of your furnace cabinet.

Furnace Filters for the American Standard Freedom 80

Air Flow ConfigurationCabinet WidthFilter Size(s)
Upflow / Horizontal16.5″ 16x25x1
Upflow / Horizontal19.5″ 17x25x1
Upflow / Horizontal23″


Upflow / Horizontal26.5″


How do I replace the filter on the American Standard Freedom 90?

For most upflow models the filter will be found in the bottom or side of the blower cabinet. For downflow models the filters are found in the blower vent. The replacement filters for the American Standard Freedom 90 is found in the chart below. The chart corresponds to the airflow configuration and cabinet width of your unit.

Furnace Filters for the American Standard Freedom 90

Air Flow ConfigurationCabinet Width Filter Size(s)
Upflow / Horizontal17.5″17x25x1(bottom)
Upflow / Horizontal21″20x25x1(bottom)
Upflow / Horizontal24.5″24x25x1(bottom)
Downflow / HorizontalAll Two 16x20x1

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