Bottom Dimension C on LOWEST row of Louvers.In other words, how much of a flange do you want below the louvers that are the closest to the bottom.
R3

WIDTH

BY

HEIGHT

Inches

WIDTH

BY

HEIGHT

Inches

A2

Louver

QTY

B2

D”

E1”

E2”

HEIGHT OF METAL PLATE
WIDTH OF METAL PLATE
R4
R2
R3
R1
R2
R4
Left Dim. D Center Dimension E1 B1 Right Dim F B2
R1
Center Dimension E2 A3 B3 A2 A1

B1”

Triple Row Louvers