What is the maximum mesh size on a pet travel crate?

For dogs, the mesh gauge on the crate door and ventilation panels must be no larger than 25 mm × 25 mm. For cats, the maximum is 19 mm × 19 mm. Anything wider risks paws or noses pushing through, which can cause injury and will lead to airline refusal at check-in. Airpets supplies crates with compliant mesh as standard.