What is the velocity of water in the indoor heating pipe of low temperature hot water floor radiant heating system? Why? Great gods, help!

The velocity of water in the indoor heating pipeline of low-temperature hot water floor radiant heating system should not be less than 0.25m/s and not more than 0.5m/s! Objective: Let the water flow take away the air and prevent the air from floating and gathering! Qijia Group Buying Network Yangzhou Station-/