When sourcing safety air guns, prioritize OSHA compliance (Standard 1910.242b), which mandates that static pressure at the nozzle must not exceed 30 psi when dead-ended. Look for venturi-style nozzles or side-port designs that allow air to escape if the tip is blocked. Additionally, evaluate the noise level (dBA); high-quality safety air guns should operate below 85-90 dBA to meet hearing protection standards. Material choice is also critical: aluminum or stainless steel nozzles offer durability, while ergonomic nylon or composite bodies reduce operator fatigue during long shifts.