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TFM210A9FR0 [ ] Electronic Air Filter, “Perfect Fit” High Efficiency (24-1/2" Wide Gas Furnace) .......................................................... TFM245A9FR0 [ ] Electronic Air Filter, “Perfect Fit” Standard Efficiency (14-1/2" Wide Gas Furnace) ..................................................... TFP145A9FR0 [ ] Electronic Air Filter, “Perfect Fit” Standard Efficiency (17-1/2" Wide Gas Furnace) ..................................................... TFP175A9FR0 [ ] Electronic Air Filter