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Return air support boxes
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Duct Size
20 x 10-20 x 16 in
25 x 10-25 x 16 in
25 x 10 in
14-1/2 X 28-1/2 in
17-1/2 X 28-1/2 in
21-1/2 X 28-1/2 in
24-1/2 X 28-1/2 in
4 x 14 x 25 in
4 x 16 x 25 in
4 x 20 x 25 in
20 x 8-20 x 16 in
24 x 8-24 x 16 in
4 x 24 x 24 in
1 in. X 1 in. X 1 in.
Gauge
26 ga
22 ga
Material
Galvanized Steel
Galvanised Steel
Hot Dipped Galvanized Steel
Unit Length (in.)
19
30
38
14.75
17.75
21.75
24.75
15.5
19.25
23.25
15
25
25.25
28.625
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Southwark Metal Mfg. Co.
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Return Air Support Box
SB30 Return Air Support Box
Mfr #SB30
Part #189SB-248
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Southwark Metal Mfg. Co.
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Return Air Support Box
SB38(25 X 10) R.A. SUPPORT BOX
Mfr #SB382410
Part #189SB-2410
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