Potential answers for "Passage in an HVAC system"

⭐⭐⭐⭐ DUCT
⭐⭐⭐ HEATPUMP
⭐⭐⭐ ALIMENTARYCANAL
⭐⭐⭐ VENTS
⭐⭐⭐ AIRVENT
⭐⭐ BTUS
⭐⭐ BTU
⭐⭐ DUCTCON

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