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 W18AA | VoltAire AN04 | Difference |
|---|---|---|---|
| Distance from the top to Supply | 2.183" | 1.94" | -0.243" |
| Mismatch | Bard W18AA | VoltAire AN04 | Difference |
|---|---|---|---|
| Unit width | 33.3" | 14.13" | -19.17" |
| Unit height | 74.563" | 30" | -44.563" |
| Unit depth | 17.125" | 12.3" | -4.825" |
| Unit weight | 325 lbs | 65.6 lbs | -259.4 lbs |
| Supply Air | 19.88" x 7.88" | 11.54" x 11.8" | -8.34" x +3.92" |
| Return Air | 19.88" x 11.88" | 11.54" x 6.59" | -8.34" x -5.29" |
| Distance between Supply and Return | 20.56" | 7.65" | -12.91" |
| Distance from Return to bottom | 32.06" | 2.02" | -30.04" |