These units don’t appear to have much in common. If you’re replacing one with the other, you’ll need to make some modifications to wall, unit or something in between with a plate or adapter curb.
| Match | Bard WA121 | Bard 18WH4 | Difference |
|---|---|---|---|
| No matches in measurement | - | - | - |
| Mismatch | Bard WA121 | Bard 18WH4 | Difference |
|---|---|---|---|
| Unit width | 30.125" | 32.25" | +2.125" |
| Unit height | 46" | 69.375" | +23.375" |
| Unit depth | 14.625" | 13.5" | -1.125" |
| Unit weight | 155 lbs | 315 lbs | +160 lbs |
| Supply Air | 17" x 5" | 20" x 8" | +3" x +3" |
| Return Air | 17" x 10" | 20" x 12" | +3" x +2" |
| Distance from the top to Supply | 2.25" | 1.375" | -0.875" |
| Distance between Supply and Return | 5" | 20.5" | +15.5" |
| Distance from Return to bottom | 23.75" | 27.5" | +3.75" |