When evaluating a poultry manure dryer, you must prioritize the moisture reduction capability, typically aiming to reduce moisture from 70-80% down to 12-15%. Look for triple-pass rotary drum designs which offer higher thermal efficiency. Ensure the equipment uses heat-resistant alloy steel (e.g., Q345B or stainless steel) for the inner drum to withstand the corrosive nature of manure. Additionally, verify the deodorization and dust collection systems, such as cyclone dust collectors and wet scrubbers, to meet environmental discharge standards.