![How to identify supply and return ducts](https://images.squarespace-cdn.com/content/v1/60bdfc0a16d6b011fa60b69b/1719999100366-90C4AT38JU5A8OY9VD0Q/How%2Bto%2Bidentify%2Bsupply%2Band%2Breturn%2Bducts.jpg)
How to identify supply and return ducts
Supply ducts deliver conditioned air from the HVAC unit to rooms, typically with air blowing out through registers. Return ducts pull air from rooms back to the HVAC unit, usually through larger, fixed grilles. To identify, feel for airflow direction: supply ducts blow air out, while return ducts draw air in. Supply ducts often have adjustable vents, while return ducts do not.