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The Lennox 75X73 is the correct replacement for the following models:
The Lennox 75X73 Metal Mesh Filter is a replacement metal mesh filter for the Lennox PCO-12C and PCO-12U. This metal air filter is constructed out of titanium dioxide and coated with a honeycomb screen. This hydrocarbon filter measures approximately 16.5x26x1 and should be replaced every 2 years to achieve the best performance.
Lennox 75X73 Metal Mesh Filter specifications: