When sourcing for high-rise applications, prioritize load capacity and deployment length. Ensure the ladder is rated for at least 1,000 lbs (approx. 450kg) to support multiple evacuees simultaneously. The deployment mechanism should be 'tangle-free' to ensure rapid use. For materials, aluminum rungs with high-strength nylon webbing or steel chains are preferred for their balance of weight and fire resistance. Additionally, verify the anti-slip profile of the rungs to ensure safety in wet or smoky conditions.