15mm, 25mm, 32mm round holes at 60° staggered pitch with 40% open area

9.5mm, 18mm, 25mm round holes at randomised pitch with 22% open area

10mm, 14mm, 20mm square holes at 90° straight pitch with 22% open area

5mm, 8mm, 12mm round holes | 20mm square holes at 90° straight pitch with 15% open area

5mm, 10mm, 15mm, 20mm, 25mm round holes at 90° straight pitch with 20% open area

25mm, 28mm, 32mm round holes at 60° staggered pitch with 56% open area

25mm, 34mm, 40mm round holes at randomised pitch with 40% open area

14mm, 20mm, 25mm square holes at 90° straight pitch with 40% open area

10mm square holes | 45x10mm rectangle holes at straight pitch with 25% open area

14mm square holes at randomised pitch with 20% open area

5mm, 8mm, 12mm, 15mm, 20mm round holes at 90° straight pitch with 22% open area

16mm hexagon holes at 60° staggered pitch with 35% open area

6.5mm round holes at 60° staggered pitch with 23% open area

12mm, 25mm, 34mm round holes in circular array with 25% open area

4mm, 12mm, 15mm, 18mm, 22mm, 25mm round holes at 90° straight pitch with 10% open area

22mm, 25mm, 30mm, 32mm, 34mm round holes at 90° straight pitch with 40% open area

27.7mm hexagon holes at 60° staggered pitch with 50% open area

20mm triangle holes at 60° staggered pitch with 25% open area

8mm, 13mm, 16mm, 20mm, 22mm, 25mm, 28mm round holes at 90° straight pitch with 17% open area

8mm, 15mm, 22mm round holes at 90° straight pitch with 17% open area