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 | VoltAire AT12 | Bard W18AY | Difference |
|---|---|---|---|
| Distance from the top to Supply | 2.02" | 2.183" | +0.163" |
| Mismatch | VoltAire AT12 | Bard W18AY | Difference |
|---|---|---|---|
| Unit width | 16.39" | 33.3" | +16.91" |
| Unit height | 43.99" | 74.563" | +30.573" |
| Unit depth | 12.3" | 17.125" | +4.825" |
| Unit weight | 94.6 lbs | 329 lbs | +234.4 lbs |
| Supply Air | 13.5" x 11.75" | 19.88" x 7.88" | +6.38" x -3.87" |
| Return Air | 13.5" x 16.62" | 19.88" x 11.88" | +6.38" x -4.74" |
| Distance between Supply and Return | 11.6" | 20.56" | +8.96" |
| Distance from Return to bottom | 2" | 32.06" | +30.06" |