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Return Air220 V300400500
Metal 

170 SERIES WHITE RETURN AIR
AVAILABLE SIZES BELOW.... ALL SIZES ARE THE HOLE SIZE. THE OUTSIDE (FULL) SIZE OF THE VENT WILL BE 1 5/8 INCHES LARGER.
6 X 6                    18 X 4                    36 X 4
8 X 8                    18 X 6                    36 X 6 
10X 4                   18 X 8                    36 X 8         
10 X 6                  18 X 10                  36 X 10
10 X 8                  18 X 12                  36 X 12
10 X 10                18 X 14                  36 X 14
10 X 12                18 X 16                  36 X 16
10 X 14                18 X 18                  36 X 18
10 X 16                18 X 20                  36 X 20
10 X 18                18 X 24                  36 X 24
10 X 20                18 X 30                  36 X 30
10 X 24                18 X 36                  36 X 36                 
10 X 30                20 X 4
10 X 36                20 X 6
12 X 4                  20 X 8
12 X 6                  20 X 10
12 X 8                  20 X 12
12 X 10                20 X 14
12 X 12                20 X 16
12 X 14                20 X 18
12 X 16                20 X 20
12 X 18                20 X 24
12 X 20                20 X 30
12 X 24                20 X 36
12 X 36                24 X 4
14 X 4                  24 X 6
14 X 6                  24 X 8
14 X 8                  24 X 10
14 X 10                24 X 12
14 X 12                24 X 14
14 X 14                24 X 16
14 X 16                24 X 18
14 X 18                24 X 20
14 X 20                24 X 24
14 X 24                24 X 30
14 X 30                24 X 36
14 X 36                30  X 4
16 X 4                  30 X 6
16 X 6                  30 X 8
16 X 8                  30 X 10
16 X 10                30 X 12
16 X 12                30 X 14
16 X 14                30 X 16
16 X 16                30 X 18
16 X 18                30 X 20
16 X 20                30 X 24
16 X 24                30 X 30
16 X 30                30 X 36
16 X 36