Bard 36WA3
Bard 30WH6
Unit depthUnit depthSupply AirReturn AirSupply AirReturn Air28"8"28"14"27.875"7.875"27.875"13.875"38.25"38"74"74"15.25"16.5"1.375"1.375"18"18"32.625"32.875"Supply AirReturn AirSupply AirReturn Air
OPENING MATCH

Your openings match up but double check the cabinet surroundings. Over time equipment coils have gotten larger for better efficiency and cabinet dimensions have changed.

Match Bard 36WA3 Bard 30WH6 Difference
Unit width38.25"38"-0.25"
Unit height74"74"0"
Supply Air28" x 8"27.875" x 7.875"-0.125" x -0.125"
Return Air28" x 14"27.875" x 13.875"-0.125" x -0.125"
Distance from the top to Supply1.375"1.375"0"
Distance between Supply and Return18"18"0"
Distance from Return to bottom32.625"32.875"+0.25"
Mismatch Bard 36WA3 Bard 30WH6 Difference
Unit depth15.25"16.5"+1.25"
Unit weight385 lbs325 lbs-60 lbs