Bard WA421
Bard W36LB
Unit depthUnit depthSupply AirReturn AirSupply AirReturn Air29.875"9.875"29.875"15.875"27.88"7.88"27.88"13.88"42"38.2"84.875"74.563"22.5"17.125"2.125"2.123"30"17.93"27"32.75"Supply AirReturn AirSupply AirReturn Air
MISMATCH

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 WA421 Bard W36LB Difference
Distance from the top to Supply2.125"2.123"-0.002"
Mismatch Bard WA421 Bard W36LB Difference
Unit width42"38.2"-3.8"
Unit height84.875"74.563"-10.312"
Unit depth22.5"17.125"-5.375"
Unit weight500 lbs380 lbs-120 lbs
Supply Air29.875" x 9.875"27.88" x 7.88"-1.995" x -1.995"
Return Air29.875" x 15.875"27.88" x 13.88"-1.995" x -1.995"
Distance between Supply and Return30"17.93"-12.07"
Distance from Return to bottom27"32.75"+5.75"