An important parameter of the screen is the open area. Open area F_o (%) is the relation of the slot surface to the total screen surface. Open area is calculated according to the following formula:

F_o= S/(S+A) x 100 (%)

A-Working profile width

S-Slot size

For example:

Screen made from Sb28 profile with slot S =0.24 mm

F。= 0.24/(0.24+2.2) x 100%= 9.6%