### Rectangular hole in staggered row (LCZ)

#### Perforation mark: LC (w*l) Z (t1*t2)

• Open area (%): A0 = (w * l / t1 * t2) * 100 u %
• Number of holes per m2: n = 1.000.000 / t1 * t2
• a2 = y * t1 + w
• y = number of distances t1 parallel to a2
• b2 = x * u + l
• x = number of distances in parallel with b2
• u = 0,5 * t2
• Perforation direction: a1 ili b1

### Rectangular hole in parallel row (LCU)

#### Perforation mark: LC (w*l) U (t1*t2)

• Open area (%): A0 = (w * l / t1 * t2) * 100 u %
• Number of holes per m2: n = 1.000.000 / t1 * t2
• a2 = y1 * t1 + w
• y1 = number of distances t1 parallel to a2
• b2 = x1 * t2 + l
• x1 = number of distances t2 parallel to b2
• Perforation direction: a1 ili b1

### Rectangular hole in staggered row (LCS)

#### Perforation mark: LC (w*l) S (t1*t2)

• Open area (%): A0 = (w * l / 0,5 (t1 * t2) * 100 u %
• Number of openings per m2: n = 1.000.000 / 0,5 (t1 * t2)
• a2 = y * t1 + w
• y = number of distances t1 parallel to a2
• b2 = x * u + l
• x = number of distances in parallel with b2
• u = 0,5 t2
• Smer perforacije: a1 ili b1 