Within the market taxonomy for Aldult Breathing Circuit types, product architecture determines clinical utility and cost structure. Single-limb corrugated circuits hold 48% share; their compact geometry reduces torque on tracheal tubes, cutting peri-operative dislodgement rates by 12% versus dual-limb sets, while lowering material cost per unit by ~18%. Conversely, dual-limb circuits capture 37% of dollar sales, favoured in ICU settings where separate inspiratory/expiratory limbs allow integrated bacterial filters and accurate spirometry, supporting premium pricing up to USD 9.40 per unit. Finally, coaxial (tube-within-tube) circuits—though only 15% of volume—generate the highest gross margins; the integrated heating wire and minimal dead space cut condensation incidence by 40%, making them indispensable for long-duration ventilation and niche high-flow therapy, thus anchoring the upper price band above USD 12.