Projection
(A)

Return
(B)

Wall
Thickness

Net Gain Over Window Size

Panning Tip-To-Tip

Head
(C)

Sill
(D)

Jamb
(E)

Width
(F)

Height
(G)

3/4"

2 1/2"

0.092"

2 1/16"

2 1/16"

2 1/8"

Ww+ 4 1/4"

Wh + 4 1/8"

3/4"

4 1/2"

0.092"

4 1/16"

4 1/16"

4 1/8"

Ww+ 8 1/4"

Wh + 8 1/8"

2"

2"

0.050"

1 9/16"

1 9/16"

1 5/8"

Ww+ 3 1/4"

Wh + 3 1/8"

2"

2 1/2"

0.050"

2 1/16"

2 1/16"

2 1/8"

Ww+ 4 1/4"

Wh + 4 1/8"

2"

3"

0.050"

2 9/16"

2 9/16"

2 5/8"

Ww+ 5 1/4"

Wh + 5 1/8"

3"

3 1/2"

0.078"

3 1/16"

3 1/16"

3 1/8"

Ww+ 6 1/4"

Wh + 6 1/8"

4"

3 1/2"

0.078"

3 1/16"

3 1/16"

3 1/8"

Ww+ 6 1/4"

Wh + 6 1/8"

Colonial
(Wide)

Curved

0.078"

2 1/2"

2 1/2"

2 1/2"

Ww+ 5"

Wh + 5"

Colonial
(Narrow)

Curved

0.078"

2 1/16"

2 1/16"

2 3/16"

Ww+ 4 3/8"

Wh + 4 1/8"

Formulas:
Pw = Ww + (2 x R) - 3/4“
Ph = Wh + (2 x R) - 7/8“
Where
Pw = Panning width
Ph = Panning height
Ww = Window width
Wh = Window height
R = Return