A-2-x-4-bird-friendly-rule

Figure 2: A guideline for bird-safe patterns based on research and testing is the ‘2x4’ rule, which stipulates glass patterns should be placed no more than 50 mm (2 in.) apart vertically or 100 mm (4 in.) apart horizontally.

Figure 2: A guideline for bird-safe patterns based on research and testing is the ‘2×4’ rule, which stipulates glass patterns should be placed no more than 50 mm (2 in.) apart vertically or 100 mm (4 in.) apart horizontally.

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