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 WA491 | Bard W18LF | Difference |
|---|---|---|---|
| Distance from the top to Supply | 2.175" | 2.18" | +0.005" |
| Mismatch | Bard WA491 | Bard W18LF | Difference |
|---|---|---|---|
| Unit width | 42.075" | 33.3" | -8.775" |
| Unit height | 84.875" | 74.56" | -10.315" |
| Unit depth | 22.432" | 17.13" | -5.302" |
| Unit weight | 500 lbs | 329 lbs | -171 lbs |
| Supply Air | 29.88" x 9.88" | 19.88" x 7.88" | -10" x -2" |
| Return Air | 29.88" x 15.88" | 19.88" x 11.88" | -10" x -4" |
| Distance between Supply and Return | 30" | 20.56" | -9.44" |
| Distance from Return to bottom | 26.94" | 32.06" | +5.12" |