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Best Air 401 Merv 11 EAUSBG2128-G
21  x 28.5 x 5.375 EAUSBG2428-G
24.5  x 28.5 x 5.375
Best Air 401 Filter
Our Price: $35.75
Best Air 401 Expandable Filter
Merv 11
Upflow Bottom Side Return Base
EAUSBG2128-G
21 x 28.5 x 5.375
Galvanized Sheet Metal
Upflow Bottom Side Return Base
EAUSBG2428-G
24.5 x 28.5 x 5.375
Galvanized Sheet Metal
EAUSBG1728-G
17.5 x 28.5 x 5.375
Upflow Bottom Side Return Base
EAUSBG1728-G
17.5 x 28.5 x 5.375
Galvanized Sheet Metal