Bard W24H1
Bard W18AA
Unit depthUnit depthSupply AirReturn AirSupply AirReturn Air19.88"7.88"19.88"11.88"19.88"7.88"19.88"11.88"33.3"33.3"70.563"74.563"17.125"17.125"2.183"2.183"20.56"20.56"28.06"32.06"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 W24H1 Bard W18AA Difference
Unit width33.3"33.3"0"
Unit depth17.125"17.125"0"
Supply Air19.88" x 7.88"19.88" x 7.88"0"
Return Air19.88" x 11.88"19.88" x 11.88"0"
Distance from the top to Supply2.183"2.183"0"
Distance between Supply and Return20.56"20.56"0"
Mismatch Bard W24H1 Bard W18AA Difference
Unit height70.563"74.563"+4"
Unit weight360 lbs325 lbs-35 lbs
Distance from Return to bottom28.06"32.06"+4"