Size and Compatibility: Determine the appropriate size of the hose that fits your specific air conditioning system. Check the manufacturer's specifications or consult an expert to ensure compatibility with your system's fittings, connectors, and components.

Routing and Positioning: Properly route the hoses to avoid sharp bends, kinks, or obstructions that could restrict refrigerant flow. Keep the hoses away from hot engine components and moving parts to prevent damage.

As to standard barrier ac hose and reduced barrier ac hose, the inner diameter is same, the different is the outer diameter. Standard barrier ac hose has a bigger outer diameter than reduced barrier ac hose.