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 36WA6 | Bard 18WH4 | Difference |
|---|---|---|---|
| Supply Air | 27.875" x 7.875" | 20" x 8" | -7.875" x +0.125" |
| Distance from the top to Supply | 1.375" | 1.375" | 0" |
| Mismatch | Bard 36WA6 | Bard 18WH4 | Difference |
|---|---|---|---|
| Unit width | 38" | 32.25" | -5.75" |
| Unit height | 74" | 69.375" | -4.625" |
| Unit depth | 16.5" | 13.5" | -3" |
| Unit weight | 380 lbs | 315 lbs | -65 lbs |
| Return Air | 27.875" x 13.875" | 20" x 12" | -7.875" x -1.875" |
| Distance between Supply and Return | 18" | 20.5" | +2.5" |
| Distance from Return to bottom | 32.875" | 27.5" | -5.375" |