You can refer to table below to find out what duct adaptor you'll need to connect your duct work to the unit depending on the model:
| Model | Inlet (inches) | Outlet (inches) |
| SENA-09HF/ID | 23.6 x 7.3 | 21.1 x 6 |
| SENA-12HF/ID | 23.6 x 7.3 | 21.1 x 6 |
| SENA-18HF/ID | 30.8 x 7.5 | 27.8 x 5.4 |
| SENA-24HF/ID | 39.4 x 9 | 36.5 x 6.9 |
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