Tunnel Test Report Fall2023/Spring 2024
The latest test results for WindowAlert's bird-friendly glass solutions are in. The products were evaluated at Foreman’s Branch testing facility during Fall 2023 and Spring 2024, using a tunnel test methodology. This involves flying at least 80 individual birds towards a tunnel containing both a test pane and a control pane, then recording which pane the birds avoid.
WindowAlert tested four different glass samples with varying patterns of UV liquid dots and decals, aimed at deterring bird collisions:
- Walert 1: 4mm clear glass with 1” UV liquid dots spaced 2” vertically and 4” horizontally. Threat Factor (TF): 41.
- Walert 2: A combination of UV liquid dots and square decals, resulting in a more varied pattern. TF: 33.
- Walert 3: Increased density of dots spaced 2” both vertically and horizontally. TF: 17.
- Walert 4: A mix of dots and square decals, with additional dots filling in the gaps. TF: 17.
ABC Birds considers materials with a TF ≤ 30 as bird-friendly, corresponding to a reduction in collisions by at least 50%. The test results indicate that Walert 3 and 4 are highly effective, while Walert 1 and 2 show moderate deterrent capabilities.
Why it matters: Bird collisions with glass are a significant conservation issue, with millions of fatalities each year. These results help refine building material choices to protect bird populations.