Flush With Frame

Duct Opening Overall Dimensions
  Flush With 90° Corners Flush With 45° Corners
2-1/2 x 10 4.5 x 11.8125 5 x 11.8125
2-1/2 x 12 4.5 x 14.125 5 x 14.125
2-1/2 x 14 4.5 x 16 5 x 16
4 x 8 6.75 x 10.25 6.75 x 10.25
4 x 10 6.75 x 12.25 6.75 x 12.25
4 x 12 6.75 x 14.5 6.75 x 14.5
4 x 14 6.75 x 16.5 6.75 x 16.5
6 x 10 9 x 12.25 9 x 12.25
6 x 12 9 x 14.5 9 x 14.5
6 x 14 9 x 16.5 9 x 16.5

Flush No Frame

Duct Opening Overall Dimensions
Flush No Frame
2-1/2 x 10 4.5 x 12
2-1/2 x 12 4.5 x 14
2-1/2 x 14 4.5 x 16
4 x 8 6 x 10
4 x 10 6 x 12
4 x 12 6 x 14
4 x 14 6 x 16
6 x 10 8 x 12
6 x 12 8 x 14
6 x 14 8 x 16

Insert

Duct Opening Overall Dimensions
Insert
2-1/2 x 10 3.4375 x 10.9375
2-1/2 x 12 3.4375 x 12.9375
2-1/2 x 14 3.4375 x 14.9375
4 x 8 4.9375 x 8.9375
4 x 10 4.9375 x 10.9375
4 x 12 4.9375 x 12.9375
4 x 14 4.9375 x 14.9375
6 x 10 6.9375 x 10.9375
6 x 12 6.9375 x 12.9375
6 x 14 6.9375 x 14.9375