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12 X 12 Return Air Box SHMRAC301212
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$20.79
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20 X 12 Return Air Box SHMRAC302012
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$23.59
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20 X 14 Return Air Box SHMRAC262014
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$25.49
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20 X 16 Return Air Box SHMRAC6302016
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$26.99
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20 X 20 Return Air Box SHMRAC302020
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$36.25
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24 X 12 Return Air Box SHMRAC302412
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$26.99
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24 X 24 Return Air Box SHMRAC302424
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$35.99
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25 X 14 Return Air Box SHMRAC262514
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$28.79
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25 X 16 Return Air Box SHMRAC262516
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$37.99
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25 X 20 Return Air Box SHMRAC302520
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$33.99
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30 X 20 Return Air Box SHMRAC628302
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$39.99
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