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- Spring-hinged door for easy access
- Built for standard filters
- Gasketed door ensures tight seal
- Fully insulated
- Sizes to fit all furnaces through 5 tons
- Individually Boxed
- Outside Dimension: 3 3/4 x 21 3/8 x 22
- Duct Opening: 17 1/2 x 19
- Filter Size 20 x 20
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